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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-24 14:39:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-24 14:39:36 -0700 |
| commit | d07c6f46c441c32c55076a45479530707170c55c (patch) | |
| tree | 2635d640df112a3039556ee602760ebb2454694b /drivers/vfio | |
| parent | Merge branch 'for-linus' of git://git.kernel.dk/linux-block (diff) | |
| parent | vfio: Rework group release notifier warning (diff) | |
| download | linux-dev-d07c6f46c441c32c55076a45479530707170c55c.tar.xz linux-dev-d07c6f46c441c32c55076a45479530707170c55c.zip | |
Merge tag 'vfio-v4.11-rc4' of git://github.com/awilliam/linux-vfio
Pull VFIO fix from Alex Williamson:
"Rework sanity check for mdev driver group notifier de-registration
(Alex Williamson)"
* tag 'vfio-v4.11-rc4' of git://github.com/awilliam/linux-vfio:
vfio: Rework group release notifier warning
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 609f4f982c74..561084ab387f 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -403,6 +403,7 @@ static void vfio_group_release(struct kref *kref) struct iommu_group *iommu_group = group->iommu_group; WARN_ON(!list_empty(&group->device_list)); + WARN_ON(group->notifier.head); list_for_each_entry_safe(unbound, tmp, &group->unbound_list, unbound_next) { @@ -1573,6 +1574,10 @@ static int vfio_group_fops_open(struct inode *inode, struct file *filep) return -EBUSY; } + /* Warn if previous user didn't cleanup and re-init to drop them */ + if (WARN_ON(group->notifier.head)) + BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); + filep->private_data = group; return 0; @@ -1584,9 +1589,6 @@ static int vfio_group_fops_release(struct inode *inode, struct file *filep) filep->private_data = NULL; - /* Any user didn't unregister? */ - WARN_ON(group->notifier.head); - vfio_group_try_dissolve_container(group); atomic_dec(&group->opened); |