Commit 1a908c73 authored Jan 26, 2008 by Cornelia Huck Committed by Martin Schwidefsky Jan 26, 2008

[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>

parent 46258ab5

drivers/s390/cio/ccwgroup.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -75,8 +75,10 @@ static void ccwgroup_ungroup_callback(struct device *dev)
		struct ccwgroup_device *gdev = to_ccwgroupdev(dev);

		mutex_lock(&gdev->reg_mutex);
		if (device_is_registered(&gdev->dev)) {
		__ccwgroup_remove_symlinks(gdev);
		device_unregister(dev);
		}
		mutex_unlock(&gdev->reg_mutex);
		}