The ce->guc_state.lock was made to protect guc_prio, which indicates the GuC priority level.
But at the begnning of the function we perform some sanity check of guc_prio outside its protected section. Move them within the locked region. Use this occasion to expand the if statement to make it clearer. Signed-off-by: Andi Shyti <[email protected]> Cc: Matthew Brost <[email protected]> Reviewed-by: Matthew Brost <[email protected]> --- Cc: Daniele Ceraolo Spurio <[email protected]> Changelog ========= - Removed the stable tags as this path is not normally under multi task stress. - Refactored the if statements in order to remove unnecessary checks (thanks, Daniele) - Added Matt's r-b. .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 27 +++++++++++-------- 1 file changed, 16 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 0eaa1064242c..9400d0eb682b 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -4267,20 +4267,25 @@ static void guc_bump_inflight_request_prio(struct i915_request *rq, u8 new_guc_prio = map_i915_prio_to_guc_prio(prio); /* Short circuit function */ - if (prio < I915_PRIORITY_NORMAL || - rq->guc_prio == GUC_PRIO_FINI || - (rq->guc_prio != GUC_PRIO_INIT && - !new_guc_prio_higher(rq->guc_prio, new_guc_prio))) + if (prio < I915_PRIORITY_NORMAL) return; spin_lock(&ce->guc_state.lock); - if (rq->guc_prio != GUC_PRIO_FINI) { - if (rq->guc_prio != GUC_PRIO_INIT) - sub_context_inflight_prio(ce, rq->guc_prio); - rq->guc_prio = new_guc_prio; - add_context_inflight_prio(ce, rq->guc_prio); - update_context_prio(ce); - } + + if (rq->guc_prio == GUC_PRIO_FINI) + goto exit; + + if (!new_guc_prio_higher(rq->guc_prio, new_guc_prio)) + goto exit; + + if (rq->guc_prio != GUC_PRIO_INIT) + sub_context_inflight_prio(ce, rq->guc_prio); + + rq->guc_prio = new_guc_prio; + add_context_inflight_prio(ce, rq->guc_prio); + update_context_prio(ce); + +exit: spin_unlock(&ce->guc_state.lock); } -- 2.45.1
