VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Tejun Heo <tj@kernel.org> 2021-07-27 14:38:09 -1000 committer: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2021-08-04 12:47:49 +0200 commit: caed0df2e52daff8f7a3152bba9eca9fbf20e8eb parent: 749abc8d274f76de3c927e62abf5631712f0d9c9
Commit Summary:
blk-iocost: fix operation ordering in iocg_wake_fn()
Diffstat:
1 file changed, 6 insertions, 5 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index c2d6bc88d3f1..5fac3757e6e0 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -1440,16 +1440,17 @@ static int iocg_wake_fn(struct wait_queue_entry *wq_entry, unsigned mode,
 		return -1;
 
 	iocg_commit_bio(ctx->iocg, wait->bio, wait->abs_cost, cost);
+	wait->committed = true;
 
 	/*
 	 * autoremove_wake_function() removes the wait entry only when it
-	 * actually changed the task state.  We want the wait always
-	 * removed.  Remove explicitly and use default_wake_function().
+	 * actually changed the task state. We want the wait always removed.
+	 * Remove explicitly and use default_wake_function(). Note that the
+	 * order of operations is important as finish_wait() tests whether
+	 * @wq_entry is removed without grabbing the lock.
 	 */
-	list_del_init(&wq_entry->entry);
-	wait->committed = true;
-
 	default_wake_function(wq_entry, mode, flags, key);
+	list_del_init_careful(&wq_entry->entry);
 	return 0;
 }