From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Fri, 15 Oct 2010 15:20:45 +0000 (+0200)
Subject: mtd: blktrans: fix a race vs kthread_stop
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=12aebf3e1ad7dc8b076dd9674ca98f1aa6859fcd;p=openwrt%2Fstaging%2Fblogic.git

mtd: blktrans: fix a race vs kthread_stop

There is small race window that could make kthread_stop hang forever.
I found that while hacking the IR subsystem.

Signed-off-by: Maxim Levitsky <maximlevisky@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 040c2d923807..a919587ed481 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -133,6 +133,10 @@ static int mtd_blktrans_thread(void *arg)
 
 		if (!req && !(req = blk_fetch_request(rq))) {
 			set_current_state(TASK_INTERRUPTIBLE);
+
+			if (kthread_should_stop())
+				set_current_state(TASK_RUNNING);
+
 			spin_unlock_irq(rq->queue_lock);
 			schedule();
 			spin_lock_irq(rq->queue_lock);