This is a note to let you know that I've just added the patch titled
bcache: allows use of register in udev to avoid "device_busy" error.
to the 4.4-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:
bcache-allows-use-of-register-in-udev-to-avoid-device_busy-error.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d7076f21629f8f329bca4a44dc408d94670f49e2 Mon Sep 17 00:00:00 2001
From: Gabriel de Perthuis <g2p.code@xxxxxxxxx>
Date: Sun, 29 Nov 2015 18:40:23 -0800
Subject: bcache: allows use of register in udev to avoid "device_busy" error.
From: Gabriel de Perthuis <g2p.code@xxxxxxxxx>
commit d7076f21629f8f329bca4a44dc408d94670f49e2 upstream.
Allows to use register, not register_quiet in udev to avoid "device_busy" error.
The initial patch proposed at https://lkml.org/lkml/2013/8/26/549 by Gabriel de Perthuis
<g2p.code@xxxxxxxxx> does not unlock the mutex and hangs the kernel.
See http://thread.gmane.org/gmane.linux.kernel.bcache.devel/2594 for the discussion.
Cc: Denis Bychkov <manover@xxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx>
Cc: Gabriel de Perthuis <g2p.code@xxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/super.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1938,6 +1938,8 @@ static ssize_t register_bcache(struct ko
else
err = "device busy";
mutex_unlock(&bch_register_lock);
+ if (attr == &ksysfs_register_quiet)
+ goto out;
}
goto err;
}
@@ -1976,8 +1978,7 @@ out:
err_close:
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
err:
- if (attr != &ksysfs_register_quiet)
- pr_info("error opening %s: %s", path, err);
+ pr_info("error opening %s: %s", path, err);
ret = -EINVAL;
goto out;
}
Patches currently in stable-queue which might be from g2p.code@xxxxxxxxx are
queue-4.4/bcache-allows-use-of-register-in-udev-to-avoid-device_busy-error.patch
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