diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
-rw-r--r-- | drivers/iommu/iommu.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index d14413916f93..8309e634977e 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1248,6 +1248,25 @@ void iommu_group_remove_device(struct device *dev) } EXPORT_SYMBOL_GPL(iommu_group_remove_device); +#if IS_ENABLED(CONFIG_LOCKDEP) && IS_ENABLED(CONFIG_IOMMU_API) +/** + * iommu_group_mutex_assert - Check device group mutex lock + * @dev: the device that has group param set + * + * This function is called by an iommu driver to check whether it holds + * group mutex lock for the given device or not. + * + * Note that this function must be called after device group param is set. + */ +void iommu_group_mutex_assert(struct device *dev) +{ + struct iommu_group *group = dev->iommu_group; + + lockdep_assert_held(&group->mutex); +} +EXPORT_SYMBOL_GPL(iommu_group_mutex_assert); +#endif + static struct device *iommu_group_first_dev(struct iommu_group *group) { lockdep_assert_held(&group->mutex); |