From 5eb79326654de553baebcdd909eec7993ff3317b Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 22 Jun 2021 18:55:00 +0200
Subject: drm/panfrost: Shrink sched_lock
Git-commit: 94dd80feb6582a7133ee337911e08aac573c04da
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
drm/scheduler requires a lock between _init and _push_job, but the
reservation lock dance doesn't. So shrink the critical section a
notch.
v2: Lucas pointed out how this should really work, I got it all wrong
in v1.
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210622165511.3169559-5-daniel.vetter@ffwll.ch
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/panfrost/panfrost_job.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 2df3e999a38d..38f8580c19f1 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -224,14 +224,13 @@ int panfrost_job_push(struct panfrost_job *job)
struct ww_acquire_ctx acquire_ctx;
int ret = 0;
- mutex_lock(&pfdev->sched_lock);
ret = drm_gem_lock_reservations(job->bos, job->bo_count,
&acquire_ctx);
- if (ret) {
- mutex_unlock(&pfdev->sched_lock);
+ if (ret)
return ret;
- }
+
+ mutex_lock(&pfdev->sched_lock);
ret = drm_sched_job_init(&job->base, entity, NULL);
if (ret) {
--
2.38.1