| From 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d Mon Sep 17 00:00:00 2001 |
| From: NeilBrown <neilb@suse.de> |
| Date: Wed, 16 Feb 2011 13:58:51 +1100 |
| Subject: md: correctly handle probe of an 'mdp' device. |
| |
| From: NeilBrown <neilb@suse.de> |
| |
| 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> |
| |
| --- |
| drivers/md/md.c | 3 +++ |
| 1 file changed, 3 insertions(+) |
| |
| --- a/drivers/md/md.c |
| +++ b/drivers/md/md.c |
| @@ -305,6 +305,9 @@ 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); |
| |