drm/i915: Remove unwanted rcu_read_lock/unlock

We don't need rcu read side critical section to call pid_nr(),
remove it.
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191106172416.17188-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -1230,10 +1230,7 @@ static void record_request(const struct i915_request *request,
 	erq->start = i915_ggtt_offset(request->ring->vma);
 	erq->head = request->head;
 	erq->tail = request->tail;
-
-	rcu_read_lock();
 	erq->pid = ctx->pid ? pid_nr(ctx->pid) : 0;
-	rcu_read_unlock();
 }
 
 static void engine_record_requests(struct intel_engine_cs *engine,