[PATCH] block: make blkdev_issue_flush check for NULL from bio_alloc

[Elliott, Robert (Server Storage)]

bio_alloc can return NULL if gfp_mask does not contain __GPF_WAIT
and it doesn't use a mempool.  Since blkdev_issue_flush passes
along gfp_mask, it needs to check if bio_alloc returns NULL.

Signed-off-by: Robert Elliott <elli...@hp.com>
---
 block/blk-flush.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/block/blk-flush.c b/block/blk-flush.c
index 3cb5e9e..2a9fd20 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -457,6 +457,8 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t 
gfp_mask,
                return -ENXIO;
 
        bio = bio_alloc(gfp_mask, 0);
+       if (!bio)
+               return -ENOMEM;
        bio->bi_bdev = bdev;
 
        ret = submit_bio_wait(WRITE_FLUSH, bio);

---
Rob Elliott    HP Server Storage