linux-kernel - [PATCH] gpu/drm: remove drm_modeset_lock protection for drm

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Date:   Wed, 17 Jun 2020 10:38:40 +0800
From:   Bernard Zhao <bernard@...o.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Bernard Zhao <bernard@...o.com>
Subject: [PATCH] gpu/drm: remove drm_modeset_lock protection for drm_error

In function drm_atomic_helper_shutdown, maybe there is no need
to protect DRM_ERROR log in DRM_MODESET_LOCK_ALL_BEGIN &
DRM_MODESET_LOCK_ALL_END. This change is to make code run a bit
fast.

Signed-off-by: Bernard Zhao <bernard@...o.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 85d163f16801..8902fd6316fc 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3100,12 +3100,10 @@ void drm_atomic_helper_shutdown(struct drm_device *dev)
 	int ret;
 
 	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
-
 	ret = drm_atomic_helper_disable_all(dev, &ctx);
+	DRM_MODESET_LOCK_ALL_END(ctx, ret);
 	if (ret)
 		DRM_ERROR("Disabling all crtc's during unload failed with %i\n", ret);
-
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
 }
 EXPORT_SYMBOL(drm_atomic_helper_shutdown);
 
-- 
2.17.1