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authorNeilBrown <neilb@suse.de>2011-02-16 13:58:51 +1100
committerNeilBrown <neilb@suse.de>2011-02-16 13:58:51 +1100
commit8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d (patch)
treede4f933fe250bd2ba71727f535432a82ef68883b /drivers/md
parentcbe6ef1d2622e08e272600b3cb6040bed60f0450 (diff)
md: correctly handle probe of an 'mdp' device.
'mdp' devices are md devices with preallocated device numbers for partitions. As such it is possible to mknod and open a partition before opening the whole device. this causes md_probe() to be called with a device number of a partition, which in-turn calls mddev_find with such a number. However mddev_find expects the number of a 'whole device' and does the wrong thing with partition numbers. So add code to mddev_find to remove the 'partition' part of a device number and just work with the 'whole device'. This patch addresses https://bugzilla.kernel.org/show_bug.cgi?id=28652 Reported-by: hkmaly@bigfoot.com Signed-off-by: NeilBrown <neilb@suse.de> Cc: <stable@kernel.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 6818ff4aa8d..330addfe9b7 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -553,6 +553,9 @@ static mddev_t * mddev_find(dev_t unit)
{
mddev_t *mddev, *new = NULL;
+ if (unit && MAJOR(unit) != MD_MAJOR)
+ unit &= ~((1<<MdpMinorShift)-1);
+
retry:
spin_lock(&all_mddevs_lock);