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| author | NeilBrown <neilb@suse.de> | 2011-02-16 05:58:51 +0300 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-02-16 05:58:51 +0300 |
| commit | 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d (patch) | |
| tree | de4f933fe250bd2ba71727f535432a82ef68883b /drivers/md/md.c | |
| parent | cbe6ef1d2622e08e272600b3cb6040bed60f0450 (diff) | |
| download | linux-8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d.tar.xz | |
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/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 6818ff4aa8d6..330addfe9b77 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); |