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authorHannes Reinecke <hare@suse.de>2014-02-26 13:07:04 +0400
committerMike Snitzer <snitzer@redhat.com>2014-02-26 18:44:44 +0400
commita1989b330093578ea5470bea0a00f940c444c466 (patch)
tree496a4244b6886198f56f1af84fbfd7a9c6714d6b /drivers/md/dm-mpath.c
parent1acacc0784aab45627b6009e0e9224886279ac0b (diff)
downloadlinux-a1989b330093578ea5470bea0a00f940c444c466.tar.xz
dm mpath: fix stalls when handling invalid ioctls
An invalid ioctl will never be valid, irrespective of whether multipath has active paths or not. So for invalid ioctls we do not have to wait for multipath to activate any paths, but can rather return an error code immediately. This fix resolves numerous instances of: udevd[]: worker [] unexpectedly returned with status 0x0100 that have been seen during testing. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-mpath.c')
-rw-r--r--drivers/md/dm-mpath.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 6eb9dc9ef8f3..422a9fdeb53e 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1626,8 +1626,11 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
/*
* Only pass ioctls through if the device sizes match exactly.
*/
- if (!r && ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT)
- r = scsi_verify_blk_ioctl(NULL, cmd);
+ if (!bdev || ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT) {
+ int err = scsi_verify_blk_ioctl(NULL, cmd);
+ if (err)
+ r = err;
+ }
if (r == -ENOTCONN && !fatal_signal_pending(current))
queue_work(kmultipathd, &m->process_queued_ios);