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>

1 files changed, 4 insertions, 0 deletions

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);