From: Arnd Bergmann <arnd@relay.de.ibm.com>

The dm control device does not implement read/write, so it has no use for
seeking. Using no_llseek prevents falling back to default_llseek, which
requires the BKL.

[fweisbec@gmail.com: drop useless llseek = no_llseek]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

drivers/md/dm-ioctl.c | 1 +
1 file changed, 1 insertion(+)

diff -puN drivers/md/dm-ioctl.c~dm_ioctl-use-nonseekable_open drivers/md/dm-ioctl.c
--- a/drivers/md/dm-ioctl.c~dm_ioctl-use-nonseekable_open
+++ a/drivers/md/dm-ioctl.c
@@ -1593,6 +1593,7 @@ static long dm_compat_ctl_ioctl(struct f
#endif

static const struct file_operations _ctl_fops = {
+ .open = nonseekable_open,
.unlocked_ioctl = dm_ctl_ioctl,
.compat_ioctl = dm_compat_ctl_ioctl,
.owner = THIS_MODULE,
_

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