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dm: return earlier from dm_blk_ioctl if target doesn't implement .ioctl

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No point checking if the device is suspended if the current target
doesn't even implement .ioctl

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2014-11-16 14:21:47 -05:00
parent 5ec02084f6
commit 4d341d8216
1 changed files with 3 additions and 2 deletions
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5
drivers/md/dm.c
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@ -525,14 +525,15 @@ static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
goto out;
tgt = dm_table_get_target(map, 0);
if (!tgt->type->ioctl)
goto out;
if (dm_suspended_md(md)) {
r = -EAGAIN;
goto out;
}
if (tgt->type->ioctl)
r = tgt->type->ioctl(tgt, cmd, arg);
r = tgt->type->ioctl(tgt, cmd, arg);
out:
dm_put_live_table(md, srcu_idx);