When the system is going to hibernate or suspend and the tasks of the other entries in the call queue are frozen wait_for_completion on the call_queue might get stuck.
Change wait to interruptible and add try_to_freeze in order to allow that the waiting task is frozen as well.
Signed-off-by: Christoph Gellner cgellner@de.adit-jv.com --- drivers/tee/optee/call.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c index 6132cc8d014c..916cfa11cce2 100644 --- a/drivers/tee/optee/call.c +++ b/drivers/tee/optee/call.c @@ -12,6 +12,7 @@ #include <linux/tee_drv.h> #include <linux/types.h> #include <linux/uaccess.h> +#include <linux/freezer.h> #include "optee_private.h" #include "optee_smc.h" #define CREATE_TRACE_POINTS @@ -50,7 +51,12 @@ static void optee_cq_wait_init(struct optee_call_queue *cq, static void optee_cq_wait_for_completion(struct optee_call_queue *cq, struct optee_call_waiter *w) { - wait_for_completion(&w->c); + /* + * wait_for_completion but allow hibernation/suspend + * to freeze the waiting task + */ + while (wait_for_completion_interruptible(&w->c)) + try_to_freeze();
mutex_lock(&cq->mutex);