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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2008-01-26 14:10:50 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-01-26 14:11:04 +0100 |
| commit | 1a908c735aed44c8bbed303371202e416813b271 (patch) | |
| tree | 764da7edd4c8237b72429575e53003f280496c3b /drivers/s390 | |
| parent | 46258ab5e42eed5cbe20a83b732d6538c49ea2fe (diff) | |
| download | linux-3.10-1a908c735aed44c8bbed303371202e416813b271.tar.gz linux-3.10-1a908c735aed44c8bbed303371202e416813b271.tar.bz2 linux-3.10-1a908c735aed44c8bbed303371202e416813b271.zip | |
[S390] cio: Fix ungroup vs. machine check race in ccwgroup.
There are two ways for a ccwgroup device to be unregistered:
Via the ungroup attribute, or when on of the slave devices is killed
by a machine check. As we have to unregister the ccwgroup device
via a callback, we'll now have to check whether it hasn't been
already unregistered because of a machine check.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index dc1c5f4dd25..3964056a9a4 100644 --- a/drivers/s390/cio/ccwgroup.c +++ b/drivers/s390/cio/ccwgroup.c @@ -75,8 +75,10 @@ static void ccwgroup_ungroup_callback(struct device *dev) struct ccwgroup_device *gdev = to_ccwgroupdev(dev); mutex_lock(&gdev->reg_mutex); - __ccwgroup_remove_symlinks(gdev); - device_unregister(dev); + if (device_is_registered(&gdev->dev)) { + __ccwgroup_remove_symlinks(gdev); + device_unregister(dev); + } mutex_unlock(&gdev->reg_mutex); } |