This is a note to let you know that I've just added the patch titled
dm mpath: fix stalls when handling invalid ioctls
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-mpath-fix-stalls-when-handling-invalid-ioctls.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a1989b330093578ea5470bea0a00f940c444c466 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@xxxxxxx>
Date: Wed, 26 Feb 2014 10:07:04 +0100
Subject: dm mpath: fix stalls when handling invalid ioctls
From: Hannes Reinecke <hare@xxxxxxx>
commit a1989b330093578ea5470bea0a00f940c444c466 upstream.
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@xxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-mpath.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1541,8 +1541,11 @@ static int multipath_ioctl(struct dm_tar
/*
* 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;
+ }
return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
Patches currently in stable-queue which might be from hare@xxxxxxx are
queue-3.4/dm-mpath-fix-stalls-when-handling-invalid-ioctls.patch
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