Revert "msm: kgsl: Device mutex lock for kgsl_cancel_event"

This reverts commit 43371a3f85e286627654e10caae62db22defe6ea.

CRs-Fixed: 765051
Change-Id: Ic42960234e78a258a6918fcc2875ecc502e0e530
Signed-off-by: Anupam Sakargayan <asakarga@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl.c b/drivers/gpu/msm/kgsl.c
index 9adede8..060dbd2 100644
--- a/drivers/gpu/msm/kgsl.c
+++ b/drivers/gpu/msm/kgsl.c
@@ -1807,16 +1807,13 @@
 	list_for_each_entry_safe(event, tmp, &cancel_synclist, node) {
 
 		if (event->type == KGSL_CMD_SYNCPOINT_TYPE_TIMESTAMP) {
-			struct kgsl_device *device = cmdbatch->device;
 			/*
 			 * Timestamp events are guaranteed to signal
 			 * when canceled
 			 */
-			kgsl_mutex_lock(&device->mutex, &device->mutex_owner);
-			kgsl_cancel_event(device, event->context,
+			kgsl_cancel_event(cmdbatch->device, event->context,
 				event->timestamp, kgsl_cmdbatch_sync_func,
 				event);
-			kgsl_mutex_unlock(&device->mutex, &device->mutex_owner);
 		} else if (event->type == KGSL_CMD_SYNCPOINT_TYPE_FENCE) {
 			/* Put events that are successfully canceled */
 			if (kgsl_sync_fence_async_cancel(event->handle))