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authorMike Snitzer <snitzer@redhat.com>2017-11-25 00:27:26 -0500
committerMike Snitzer <snitzer@redhat.com>2017-12-04 10:23:10 -0500
commitafc567a4977b2d798e05153dd131a3c8d4758c0c (patch)
tree8d5abb8627ae852a7dc191ffac9dfb27c58d1635 /drivers/md
parentae64f9bd1d3621b5e60d7363bc20afb46aede215 (diff)
downloadlinux-afc567a4977b2d798e05153dd131a3c8d4758c0c.tar.bz2
dm table: fix regression from improper dm_dev_internal.count refcount_t conversion
Multiple refcounts are needed if the device was already added. The micro-optimization of setting the refcount to 1 on first added (rather than fall thru to a common refcount_inc) lost sight of the fact that the refcount_inc is also needed for the case when the device already exists and the mode need not be upgraded. Fixes: 2a0b4682e0 ("dm: convert dm_dev_internal.count from atomic_t to refcount_t") Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 88130b5d95f9..aaffd0c0ee9a 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -453,14 +453,15 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
refcount_set(&dd->count, 1);
list_add(&dd->list, &t->devices);
+ goto out;
} else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) {
r = upgrade_mode(dd, mode, t->md);
if (r)
return r;
- refcount_inc(&dd->count);
}
-
+ refcount_inc(&dd->count);
+out:
*result = dd->dm_dev;
return 0;
}