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md: correctly handle probe of an 'mdp' device.

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'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>
This commit is contained in:
NeilBrown 2011-02-16 13:58:51 +11:00
parent cbe6ef1d26
commit 8f5f02c460
1 changed files with 3 additions and 0 deletions
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3
drivers/md/md.c
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@ -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);