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| author | Mike Christie <michaelc@cs.wisc.edu> | 2013-03-02 02:45:48 +0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2013-03-02 02:45:48 +0400 |
| commit | 87eb5b21d92a92ac2da3163039d62df88c2b8422 (patch) | |
| tree | ada6ec7e575e4b95a018ecbe023af135da2b639e | |
| parent | 23cb21092eb9dcec9d3604b68d95192b79915890 (diff) | |
| download | linux-87eb5b21d92a92ac2da3163039d62df88c2b8422.tar.xz | |
dm: fix limits initialization when there are no data devices
dm_calculate_queue_limits will first reset the provided limits to
defaults using blk_set_stacking_limits; whereby defeating the purpose of
retaining the original live table's limits -- as was intended via commit
3ae706561637331aa578e52bb89ecbba5edcb7a9 ("dm: retain table limits when
swapping to new table with no devices").
Fix this improper limits initialization (in the no data devices case) by
avoiding the call to dm_calculate_queue_limits.
[patch header revised by Mike Snitzer]
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.6+
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| -rw-r--r-- | drivers/md/dm.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 0890abd9dffa..1016c14c28a0 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2446,7 +2446,7 @@ static void dm_queue_flush(struct mapped_device *md) */ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) { - struct dm_table *live_map, *map = ERR_PTR(-EINVAL); + struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); struct queue_limits limits; int r; @@ -2469,10 +2469,12 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) dm_table_put(live_map); } - r = dm_calculate_queue_limits(table, &limits); - if (r) { - map = ERR_PTR(r); - goto out; + if (!live_map) { + r = dm_calculate_queue_limits(table, &limits); + if (r) { + map = ERR_PTR(r); + goto out; + } } map = __bind(md, table, &limits); |