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| author | Jonathan Brassow <jbrassow@redhat.com> | 2013-03-08 02:24:26 +0400 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2013-03-20 06:17:57 +0400 |
| commit | 90584fc93d461520a888f691144f0879283b3624 (patch) | |
| tree | b29d3af3e2af5ff3e3761525de851d88f102f9e5 /drivers/md/md.c | |
| parent | e3620a3ad52609f64a2402e4b59300afb4b83b77 (diff) | |
| download | linux-90584fc93d461520a888f691144f0879283b3624.tar.xz | |
MD: Prevent sysfs operations on uninitialized kobjects
MD: Prevent sysfs operations on uninitialized kobjects
Device-mapper does not use sysfs; but when device-mapper is leveraging
MD's RAID personalities, MD sometimes attempts to update sysfs. This
patch adds checks for 'mddev-kobj.sd' in sysfs_[un]link_rdev to ensure
it is about to operate on something valid. This patch also checks for
'mddev->kobj.sd' before calling 'sysfs_notify' in 'remove_and_add_spares'.
Although 'sysfs_notify' already makes this check, doing so in
'remove_and_add_spares' prevents an additional mutex operation.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index fcb878f88796..aeceedfc530b 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -7663,10 +7663,8 @@ static int remove_and_add_spares(struct mddev *mddev) removed++; } } - if (removed) - sysfs_notify(&mddev->kobj, NULL, - "degraded"); - + if (removed && mddev->kobj.sd) + sysfs_notify(&mddev->kobj, NULL, "degraded"); rdev_for_each(rdev, mddev) { if (rdev->raid_disk >= 0 && |