From 47650db02dd52267953df81438c93cf8a0eb0e5e Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 7 Mar 2018 13:42:25 +0000 Subject: drm/i915: Wrap engine->schedule in RCU locks for set-wedge protection Similar to the staging around handling of engine->submit_request, we need to stop adding to the execlists->queue prior to calling engine->cancel_requests. cancel_requests will move requests from the queue onto the timeline, so if we add a request onto the queue after that point, it will be lost. Fixes: af7a8ffad9c5 ("drm/i915: Use rcu instead of stop_machine in set_wedged") Signed-off-by: Chris Wilson Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20180307134226.25492-5-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_request.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/gpu/drm/i915/i915_request.c') diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 75c8826c8cae..2f62acd2dc3d 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -1081,8 +1081,10 @@ void __i915_request_add(struct i915_request *request, bool flush_caches) * decide whether to preempt the entire chain so that it is ready to * run at the earliest possible convenience. */ + rcu_read_lock(); if (engine->schedule) engine->schedule(request, request->ctx->priority); + rcu_read_unlock(); local_bh_disable(); i915_sw_fence_commit(&request->submit); -- cgit v1.2.3