Source of device_cgroup.c - linux-imx - PHYTEC BitBucket (Stash)

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 * revalidate_active_exceptions - walks through the active exception list and
 *                revalidates the exceptions based on parent's
 *                behavior and exceptions. The exceptions that
 *                are no longer valid will be removed.
 *                Called with devcgroup_mutex held.
 * @devcg: cgroup which exceptions will be checked
 *
 * This is one of the three key functions for hierarchy implementation.
 * This function is responsible for re-evaluating all the cgroup's active
 * exceptions due to a parent's exception change.
 * Refer to Documentation/cgroups/devices.txt for more details.
 * Refer to Documentation/cgroup-v1/devices.txt for more details.
 */
static void revalidate_active_exceptions(struct dev_cgroup *devcg)
{
    struct dev_exception_item *ex;
    struct list_head *this, *tmp;
​
    list_for_each_safe(this, tmp, &devcg->exceptions) {
        ex = container_of(this, struct dev_exception_item, list);
        if (!parent_has_perm(devcg, ex))
            dev_exception_rm(devcg, ex);