dm integrity: fix to not disable/enable interrupts from interrupt context

Use spin_lock_irqsave and spin_unlock_irqrestore rather than
spin_{lock,unlock}_irq in submit_flush_bio().

Otherwise lockdep issues the following warning:
  DEBUG_LOCKS_WARN_ON(current->hardirq_context)
  WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:2748 trace_hardirqs_on_caller+0x107/0x180

Reported-by: Ondrej Kozina <okozina@redhat.com>
Tested-by: Ondrej Kozina <okozina@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 4ab10cf718c97fe0c0a086e1ba68a3199c588a08..93b18108816813bd4d49e0ba3e6eb57be7ae3d9f 100644 (file)
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1105,10 +1105,13 @@ static void schedule_autocommit(struct dm_integrity_c *ic)
 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
 {
        struct bio *bio;
-       spin_lock_irq(&ic->endio_wait.lock);
+       unsigned long flags;
+
+       spin_lock_irqsave(&ic->endio_wait.lock, flags);
        bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
        bio_list_add(&ic->flush_bio_list, bio);
-       spin_unlock_irq(&ic->endio_wait.lock);
+       spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
+
        queue_work(ic->commit_wq, &ic->commit_work);
 }