[dm-devel] [PATCH 2/3] kcopyd+snapshots race condition

[Mikulas Patocka]

Test for job->pages being zero. This will be needed for the next patch.

Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>

---
 drivers/md/dm-kcopyd.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6.29-rc8-devel/drivers/md/dm-kcopyd.c
===================================================================
--- linux-2.6.29-rc8-devel.orig/drivers/md/dm-kcopyd.c	2009-03-18 20:39:07.000000000 +0100
+++ linux-2.6.29-rc8-devel/drivers/md/dm-kcopyd.c	2009-03-18 20:39:19.000000000 +0100
@@ -297,7 +297,8 @@ static int run_complete_job(struct kcopy
 	dm_kcopyd_notify_fn fn = job->fn;
 	struct dm_kcopyd_client *kc = job->kc;
 
-	kcopyd_put_pages(kc, job->pages);
+	if (job->pages)
+		kcopyd_put_pages(kc, job->pages);
 	mempool_free(job, kc->job_pool);
 	fn(read_err, write_err, context);