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authorJens Axboe <axboe@kernel.dk>2013-11-27 19:12:58 -0700
committerJens Axboe <axboe@kernel.dk>2013-11-27 19:12:58 -0700
commite345d767f6530ec9cb0aabab7ea248072a9c6975 (patch)
tree8c9ff6086915c7303ef4c3e060f68d2734b419b1 /drivers/block
parentc170bbb45febc03ac4d34ba2b8bb55e06104b7e7 (diff)
parent2f089cb89d2f47702c31bd584c12badc88bbe17c (diff)
Merge branch 'stable/for-jens-3.13-take-two' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip into for-linus
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/xen-blkfront.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 432db1b59b00..c4a4c9006288 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -489,7 +489,7 @@ static int blkif_queue_request(struct request *req)
if ((ring_req->operation == BLKIF_OP_INDIRECT) &&
(i % SEGS_PER_INDIRECT_FRAME == 0)) {
- unsigned long pfn;
+ unsigned long uninitialized_var(pfn);
if (segments)
kunmap_atomic(segments);
@@ -2011,6 +2011,10 @@ static void blkif_release(struct gendisk *disk, fmode_t mode)
bdev = bdget_disk(disk, 0);
+ if (!bdev) {
+ WARN(1, "Block device %s yanked out from us!\n", disk->disk_name);
+ goto out_mutex;
+ }
if (bdev->bd_openers)
goto out;
@@ -2041,6 +2045,7 @@ static void blkif_release(struct gendisk *disk, fmode_t mode)
out:
bdput(bdev);
+out_mutex:
mutex_unlock(&blkfront_mutex);
}