[PATCH] drm/amd/amdgpu/amdgpu_drv.c: Replace drm_modeset_lock_all with drm_modeset_lock

From: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To: outreachy-kernel@googlegroups.com,
	dri-devel@lists.freedesktop.org,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Melissa Wen <melissa.srw@gmail.com>,
	Matthew Wilcox <willy@infradead.org>
Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Subject: [PATCH] drm/amd/amdgpu/amdgpu_drv.c: Replace drm_modeset_lock_all with drm_modeset_lock
Date: Thu, 22 Apr 2021 17:59:51 +0200	[thread overview]
Message-ID: <20210422155951.6314-1-fmdefrancesco@gmail.com> (raw)

drm_modeset_lock_all() is not needed here, so it is replaced with
drm_modeset_lock(). The crtc list around which we are looping never
changes, therefore the only lock we need is to protect access to
crtc->state.

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 671ec1002230..bce8f6793d8e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1439,17 +1439,16 @@ static int amdgpu_pmops_runtime_idle(struct device *dev)
 	if (amdgpu_device_has_dc_support(adev)) {
 		struct drm_crtc *crtc;
 
-		drm_modeset_lock_all(drm_dev);
-
 		drm_for_each_crtc(crtc, drm_dev) {
+			drm_modeset_lock(&crtc->mutex, NULL);
 			if (crtc->state->active) {
 				ret = -EBUSY;
-				break;
 			}
+			drm_modeset_unlock(&crtc->mutex);
+			if (ret < 0)
+				break;
 		}
 
-		drm_modeset_unlock_all(drm_dev);
-
 	} else {
 		struct drm_connector *list_connector;
 		struct drm_connector_list_iter iter;
-- 
2.31.1
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