diff options
| author | NeilBrown <neilb@suse.de> | 2011-02-16 13:58:51 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-07 15:05:11 -0800 |
| commit | 43f474e73901900f948524d7ca450c4408aec93f (patch) | |
| tree | 5c80af50a4e98a3a8dc989ae108d823be7a49687 /drivers/md/md.c | |
| parent | 7c457763a53170ed4815f861b7c6a758f9cb0ed3 (diff) | |
md: correctly handle probe of an 'mdp' device.
commit 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d upstream.
'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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 0e5a48342a9..4baa30837cc 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); |