Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2003-2008 Takahiro Hirofuchi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "usbip_common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "stub.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) /* be in spin_lock_irqsave(&sdev->priv_lock, flags) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 			     __u32 status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	struct stub_unlink *unlink;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	unlink = kzalloc(sizeof(struct stub_unlink), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	if (!unlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	unlink->seqnum = seqnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	unlink->status = status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	list_add_tail(&unlink->list, &sdev->unlink_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * stub_complete - completion handler of a usbip urb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * @urb: pointer to the urb completed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * When a urb has completed, the USB core driver calls this function mostly in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * the interrupt context. To return the result of a urb, the completed urb is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * linked to the pending list of returning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) void stub_complete(struct urb *urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct stub_priv *priv = (struct stub_priv *) urb->context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct stub_device *sdev = priv->sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	usbip_dbg_stub_tx("complete! status %d\n", urb->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	switch (urb->status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		/* OK */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	case -ENOENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		dev_info(&urb->dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			 "stopped by a call to usb_kill_urb() because of cleaning up a virtual connection\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	case -ECONNRESET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		dev_info(&urb->dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			 "unlinked by a call to usb_unlink_urb()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	case -EPIPE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		dev_info(&urb->dev->dev, "endpoint %d is stalled\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			 usb_pipeendpoint(urb->pipe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	case -ESHUTDOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		dev_info(&urb->dev->dev, "device removed?\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		dev_info(&urb->dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			 "urb completion with non-zero status %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			 urb->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	 * If the server breaks single SG request into the several URBs, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	 * URBs must be reassembled before sending completed URB to the vhci.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 * Don't wake up the tx thread until all the URBs are completed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (priv->sgl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		priv->completed_urbs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		/* Only save the first error status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (urb->status && !priv->urb_status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			priv->urb_status = urb->status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		if (priv->completed_urbs < priv->num_urbs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	/* link a urb to the queue of tx. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	spin_lock_irqsave(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (sdev->ud.tcp_socket == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		usbip_dbg_stub_tx("ignore urb for closed connection\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		/* It will be freed in stub_device_cleanup_urbs(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	} else if (priv->unlinking) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		stub_free_priv_and_urb(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		list_move_tail(&priv->list, &sdev->priv_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	/* wake up tx_thread */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	wake_up(&sdev->tx_waitq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static inline void setup_base_pdu(struct usbip_header_basic *base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 				  __u32 command, __u32 seqnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	base->command	= command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	base->seqnum	= seqnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	base->devid	= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	base->ep	= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	base->direction = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	struct stub_priv *priv = (struct stub_priv *) urb->context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 				 struct stub_unlink *unlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	rpdu->u.ret_unlink.status = unlink->status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	struct stub_priv *priv, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	spin_lock_irqsave(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		list_move_tail(&priv->list, &sdev->priv_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		return priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static int stub_send_ret_submit(struct stub_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	struct stub_priv *priv, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	struct msghdr msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	size_t txsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	size_t total_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	while ((priv = dequeue_from_priv_tx(sdev)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		struct urb *urb = priv->urbs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		struct usbip_header pdu_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		struct usbip_iso_packet_descriptor *iso_buffer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		struct kvec *iov = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		struct scatterlist *sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		u32 actual_length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		int iovnum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		txsize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		memset(&pdu_header, 0, sizeof(pdu_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		memset(&msg, 0, sizeof(msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		if (urb->actual_length > 0 && !urb->transfer_buffer &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		   !urb->num_sgs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			dev_err(&sdev->udev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 				"urb: actual_length %d transfer_buffer null\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				urb->actual_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			iovnum = 2 + urb->number_of_packets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		else if (usb_pipein(urb->pipe) && urb->actual_length > 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			urb->num_sgs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			iovnum = 1 + urb->num_sgs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		else if (usb_pipein(urb->pipe) && priv->sgl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			iovnum = 1 + priv->num_urbs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			iovnum = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		iov = kcalloc(iovnum, sizeof(struct kvec), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		if (!iov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 			usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_MALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		iovnum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		/* 1. setup usbip_header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		setup_ret_submit_pdu(&pdu_header, urb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		usbip_dbg_stub_tx("setup txdata seqnum: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 				  pdu_header.base.seqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		if (priv->sgl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			for (i = 0; i < priv->num_urbs; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 				actual_length += priv->urbs[i]->actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			pdu_header.u.ret_submit.status = priv->urb_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			pdu_header.u.ret_submit.actual_length = actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		usbip_header_correct_endian(&pdu_header, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		iov[iovnum].iov_base = &pdu_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		iov[iovnum].iov_len  = sizeof(pdu_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		iovnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		txsize += sizeof(pdu_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		/* 2. setup transfer buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		if (usb_pipein(urb->pipe) && priv->sgl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			/* If the server split a single SG request into several
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			 * URBs because the server's HCD doesn't support SG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			 * reassemble the split URB buffers into a single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			 * return command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 			for (i = 0; i < priv->num_urbs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 				iov[iovnum].iov_base =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 					priv->urbs[i]->transfer_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 				iov[iovnum].iov_len =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 					priv->urbs[i]->actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 				iovnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			txsize += actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		} else if (usb_pipein(urb->pipe) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		    usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		    urb->actual_length > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			if (urb->num_sgs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 				unsigned int copy = urb->actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 				int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 				for_each_sg(urb->sg, sg, urb->num_sgs, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 					if (copy == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 						break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 					if (copy < sg->length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 						size = copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 					else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 						size = sg->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 					iov[iovnum].iov_base = sg_virt(sg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 					iov[iovnum].iov_len = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 					iovnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 					copy -= size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 				iov[iovnum].iov_base = urb->transfer_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 				iov[iovnum].iov_len  = urb->actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 				iovnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			txsize += urb->actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		} else if (usb_pipein(urb->pipe) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			   usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			 * For isochronous packets: actual length is the sum of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			 * the actual length of the individual, packets, but as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			 * the packet offsets are not changed there will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			 * padding between the packets. To optimally use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			 * bandwidth the padding is not transmitted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			for (i = 0; i < urb->number_of_packets; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 				iov[iovnum].iov_base = urb->transfer_buffer +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 					urb->iso_frame_desc[i].offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 				iov[iovnum].iov_len =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 					urb->iso_frame_desc[i].actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 				iovnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 				txsize += urb->iso_frame_desc[i].actual_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			if (txsize != sizeof(pdu_header) + urb->actual_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 				dev_err(&sdev->udev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 					"actual length of urb %d does not match iso packet sizes %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 					urb->actual_length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 					txsize-sizeof(pdu_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 				kfree(iov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 				usbip_event_add(&sdev->ud,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 						SDEV_EVENT_ERROR_TCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 				return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		/* 3. setup iso_packet_descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			ssize_t len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			if (!iso_buffer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 				usbip_event_add(&sdev->ud,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 						SDEV_EVENT_ERROR_MALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 				kfree(iov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 				return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 			iov[iovnum].iov_base = iso_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			iov[iovnum].iov_len  = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			txsize += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 			iovnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 						iov,  iovnum, txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		if (ret != txsize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			dev_err(&sdev->udev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 				"sendmsg failed!, retval %d for %zd\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 				ret, txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			kfree(iov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			kfree(iso_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		kfree(iov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		kfree(iso_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		total_size += txsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	spin_lock_irqsave(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		stub_free_priv_and_urb(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	return total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	struct stub_unlink *unlink, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	spin_lock_irqsave(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		list_move_tail(&unlink->list, &sdev->unlink_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		return unlink;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static int stub_send_ret_unlink(struct stub_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	struct stub_unlink *unlink, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	struct msghdr msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	struct kvec iov[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	size_t txsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	size_t total_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		struct usbip_header pdu_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		txsize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		memset(&pdu_header, 0, sizeof(pdu_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		memset(&msg, 0, sizeof(msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		memset(&iov, 0, sizeof(iov));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		usbip_dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		/* 1. setup usbip_header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		setup_ret_unlink_pdu(&pdu_header, unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		usbip_header_correct_endian(&pdu_header, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		iov[0].iov_base = &pdu_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		iov[0].iov_len  = sizeof(pdu_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		txsize += sizeof(pdu_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 				     1, txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		if (ret != txsize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 			dev_err(&sdev->udev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 				"sendmsg failed!, retval %d for %zd\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 				ret, txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 			usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		usbip_dbg_stub_tx("send txdata\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		total_size += txsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	spin_lock_irqsave(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		list_del(&unlink->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		kfree(unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	spin_unlock_irqrestore(&sdev->priv_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	return total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) int stub_tx_loop(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	struct usbip_device *ud = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	struct stub_device *sdev = container_of(ud, struct stub_device, ud);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	while (!kthread_should_stop()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		if (usbip_event_happened(ud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 		 * send_ret_submit comes earlier than send_ret_unlink.  stub_rx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		 * looks at only priv_init queue. If the completion of a URB is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		 * earlier than the receive of CMD_UNLINK, priv is moved to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		 * priv_tx queue and stub_rx does not find the target priv. In
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 		 * this case, vhci_rx receives the result of the submit request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		 * and then receives the result of the unlink request. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 		 * result of the submit is given back to the usbcore as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		 * completion of the unlink request. The request of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		 * unlink is ignored. This is ok because a driver who calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		 * usb_unlink_urb() understands the unlink was too late by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		 * getting the status of the given-backed URB which has the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		 * status of usb_submit_urb().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		if (stub_send_ret_submit(sdev) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		if (stub_send_ret_unlink(sdev) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 		wait_event_interruptible(sdev->tx_waitq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 					 (!list_empty(&sdev->priv_tx) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 					  !list_empty(&sdev->unlink_tx) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 					  kthread_should_stop()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }