From 1a908c735aed44c8bbed303371202e416813b271 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Sat, 26 Jan 2008 14:10:50 +0100 Subject: [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 Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/ccwgroup.c | 6 ++++-- 1 file 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); } -- cgit v1.2.3