linux-kernel - [PATCH] drm/amd: move DRM_ERROR log out of the mutex protect area

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Message-Id: <20201102031423.4033-1-bernard@vivo.com>
Date:   Sun,  1 Nov 2020 19:14:17 -0800
From:   Bernard Zhao <bernard@...o.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Evan Quan <evan.quan@....com>,
        Luben Tuikov <luben.tuikov@....com>,
        Xiaojie Yuan <xiaojie.yuan@....com>,
        Changfeng <Changfeng.Zhu@....com>,
        Dave Airlie <airlied@...hat.com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Bernard Zhao <bernard@...o.com>
Subject: [PATCH] drm/amd: move DRM_ERROR log out of the mutex protect area

In function amdgpu_register_gpu_instance, there is no need to
protect DRM_ERROR in mutex mgpu_info.mutex.
This change is to make the code to run a bit fast.

Signed-off-by: Bernard Zhao <bernard@...o.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index efda38349a03..cc61b0a5b8d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -104,8 +104,8 @@ void amdgpu_register_gpu_instance(struct amdgpu_device *adev)
 	mutex_lock(&mgpu_info.mutex);
 
 	if (mgpu_info.num_gpu >= MAX_GPU_INSTANCE) {
-		DRM_ERROR("Cannot register more gpu instance\n");
 		mutex_unlock(&mgpu_info.mutex);
+		DRM_ERROR("Cannot register more gpu instance\n");
 		return;
 	}
 
-- 
2.29.0