dm snapshot: change yield to msleep

Change yield() to msleep(1). If the thread had realtime priority,
yield() doesn't really yield, so the yielding process would loop
indefinitely and cause machine lockup.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 6c96db26b87c..4ceedd4f22af 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -9,6 +9,7 @@
 #include <linux/blkdev.h>
 #include <linux/ctype.h>
 #include <linux/device-mapper.h>
+#include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kdev_t.h>
@@ -735,7 +736,7 @@ static void snapshot_dtr(struct dm_target *ti)
         unregister_snapshot(s);
 
         while (atomic_read(&s->pending_exceptions_count))
-                yield();
+                msleep(1);
         /*
          * Ensure instructions in mempool_destroy aren't reordered
          * before atomic_read.
@@ -888,10 +889,10 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
 
         /*
          * Check for conflicting reads. This is extremely improbable,
-         * so yield() is sufficient and there is no need for a wait queue.
+         * so msleep(1) is sufficient and there is no need for a wait queue.
          */
         while (__chunk_is_tracked(s, pe->e.old_chunk))
-                yield();
+                msleep(1);
 
         /*
          * Add a proper exception, and remove the