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)  * zfcp device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Tracking of manually configured LUNs and helper functions to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * register the LUNs with the SCSI midlayer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Copyright IBM Corp. 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "zfcp_def.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "zfcp_ext.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * zfcp_unit_scsi_scan - Register LUN with SCSI midlayer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  * @unit: The zfcp LUN/unit to register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * When the SCSI midlayer is not allowed to automatically scan and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * attach SCSI devices, zfcp has to register the single devices with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * the SCSI midlayer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) void zfcp_unit_scsi_scan(struct zfcp_unit *unit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct fc_rport *rport = unit->port->rport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	u64 lun;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	lun = scsilun_to_int((struct scsi_lun *) &unit->fcp_lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		scsi_scan_target(&rport->dev, 0, rport->scsi_target_id, lun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 				 SCSI_SCAN_MANUAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void zfcp_unit_scsi_scan_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 					      scsi_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	zfcp_unit_scsi_scan(unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	put_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * zfcp_unit_queue_scsi_scan - Register configured units on port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * @port: The zfcp_port where to register units
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * After opening a port, all units configured on this port have to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * registered with the SCSI midlayer. This function should be called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * after calling fc_remote_port_add, so that the fc_rport is already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * ONLINE and the call to scsi_scan_target runs the same way as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * call in the FC transport class.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) void zfcp_unit_queue_scsi_scan(struct zfcp_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct zfcp_unit *unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	read_lock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	list_for_each_entry(unit, &port->unit_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		get_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		if (scsi_queue_work(port->adapter->scsi_host,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 				    &unit->scsi_work) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			put_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	read_unlock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static struct zfcp_unit *_zfcp_unit_find(struct zfcp_port *port, u64 fcp_lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct zfcp_unit *unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	list_for_each_entry(unit, &port->unit_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		if (unit->fcp_lun == fcp_lun) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			get_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 			return unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * zfcp_unit_find - Find and return zfcp_unit with specified FCP LUN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * @port: zfcp_port where to look for the unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * @fcp_lun: 64 Bit FCP LUN used to identify the zfcp_unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * If zfcp_unit is found, a reference is acquired that has to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * released later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * Returns: Pointer to the zfcp_unit, or NULL if there is no zfcp_unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  *          with the specified FCP LUN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) struct zfcp_unit *zfcp_unit_find(struct zfcp_port *port, u64 fcp_lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct zfcp_unit *unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	read_lock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	unit = _zfcp_unit_find(port, fcp_lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	read_unlock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  * zfcp_unit_release - Drop reference to zfcp_port and free memory of zfcp_unit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  * @dev: pointer to device in zfcp_unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static void zfcp_unit_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	atomic_dec(&unit->port->units);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	kfree(unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  * @port: pointer to port where unit is added
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)  * @fcp_lun: FCP LUN of unit to be enqueued
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)  * Returns: 0 success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * Sets up some unit internal structures and creates sysfs entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int zfcp_unit_add(struct zfcp_port *port, u64 fcp_lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	struct zfcp_unit *unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	int retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	mutex_lock(&zfcp_sysfs_port_units_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (zfcp_sysfs_port_is_removing(port)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		/* port is already gone */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		retval = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	unit = zfcp_unit_find(port, fcp_lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (unit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		put_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		retval = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (!unit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	unit->port = port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	unit->fcp_lun = fcp_lun;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	unit->dev.parent = &port->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	unit->dev.release = zfcp_unit_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	unit->dev.groups = zfcp_unit_attr_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	INIT_WORK(&unit->scsi_work, zfcp_unit_scsi_scan_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (dev_set_name(&unit->dev, "0x%016llx",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			 (unsigned long long) fcp_lun)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		kfree(unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (device_register(&unit->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		put_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	atomic_inc(&port->units); /* under zfcp_sysfs_port_units_mutex ! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	write_lock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	list_add_tail(&unit->list, &port->unit_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	write_unlock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 * lock order: shost->scan_mutex before zfcp_sysfs_port_units_mutex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	 * due to      zfcp_unit_scsi_scan() => zfcp_scsi_slave_alloc()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	mutex_unlock(&zfcp_sysfs_port_units_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	zfcp_unit_scsi_scan(unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	mutex_unlock(&zfcp_sysfs_port_units_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * zfcp_unit_sdev - Return SCSI device for zfcp_unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * @unit: The zfcp_unit where to get the SCSI device for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * Returns: scsi_device pointer on success, NULL if there is no SCSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  *          device for this zfcp_unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  * On success, the caller also holds a reference to the SCSI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  * that must be released with scsi_device_put.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct scsi_device *zfcp_unit_sdev(struct zfcp_unit *unit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	struct Scsi_Host *shost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct zfcp_port *port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	u64 lun;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	lun = scsilun_to_int((struct scsi_lun *) &unit->fcp_lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	port = unit->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	shost = port->adapter->scsi_host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	return scsi_device_lookup(shost, 0, port->starget_id, lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  * zfcp_unit_sdev_status - Return zfcp LUN status for SCSI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  * @unit: The unit to lookup the SCSI device for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  * Returns the zfcp LUN status field of the SCSI device if the SCSI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  * for the zfcp_unit exists, 0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) unsigned int zfcp_unit_sdev_status(struct zfcp_unit *unit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	unsigned int status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	struct zfcp_scsi_dev *zfcp_sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	sdev = zfcp_unit_sdev(unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (sdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		zfcp_sdev = sdev_to_zfcp(sdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		status = atomic_read(&zfcp_sdev->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		scsi_device_put(sdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * zfcp_unit_remove - Remove entry from list of configured units
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * @port: The port where to remove the unit from the configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * @fcp_lun: The 64 bit LUN of the unit to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * Returns: -EINVAL if a unit with the specified LUN does not exist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  *          0 on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct zfcp_unit *unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	write_lock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	unit = _zfcp_unit_find(port, fcp_lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (unit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		list_del(&unit->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	write_unlock_irq(&port->unit_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!unit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	sdev = zfcp_unit_sdev(unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (sdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		scsi_remove_device(sdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		scsi_device_put(sdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	put_device(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	device_unregister(&unit->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }