diff options
| author | Jan Beulich <JBeulich@suse.com> | 2013-03-11 09:39:55 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-05 10:16:36 -0700 |
| commit | 460c49749ae56b5f49454ad0ce0066f80a14c385 (patch) | |
| tree | 029ae91bf930b384857ae88e1d5891436b680cd0 | |
| parent | 1c9c0901afba44cf1353505b72e146e7f87a54b6 (diff) | |
| download | lwn-460c49749ae56b5f49454ad0ce0066f80a14c385.tar.gz lwn-460c49749ae56b5f49454ad0ce0066f80a14c385.zip | |
xen-blkback: fix dispatch_rw_block_io() error path
commit 0e5e098ac22dae38f957e951b70d3cf73beff0f7 upstream.
Commit 7708992 ("xen/blkback: Seperate the bio allocation and the bio
submission") consolidated the pendcnt updates to just a single write,
neglecting the fact that the error path relied on it getting set to 1
up front (such that the decrement in __end_block_io_op() would actually
drop the count to zero, triggering the necessary cleanup actions).
Also remove a misleading and a stale (after said commit) comment.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/block/xen-blkback/blkback.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 54139d0f5fec..92bdc4001f27 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -650,13 +650,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, bio->bi_end_io = end_block_io_op; } - /* - * We set it one so that the last submit_bio does not have to call - * atomic_inc. - */ atomic_set(&pending_req->pendcnt, nbio); - - /* Get a reference count for the disk queue and start sending I/O */ blk_start_plug(&plug); for (i = 0; i < nbio; i++) @@ -684,6 +678,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, fail_put_bio: for (i = 0; i < nbio; i++) bio_put(biolist[i]); + atomic_set(&pending_req->pendcnt, 1); __end_block_io_op(pending_req, -EINVAL); msleep(1); /* back off a bit */ return -EIO; |