linux-kernel - [PATCH] drm/v3d: Add missing unlock

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Message-Id: <1642868787-61384-1-git-send-email-lyz_cs@pku.edu.cn>
Date:   Sat, 22 Jan 2022 08:26:27 -0800
From:   Yongzhi Liu <lyz_cs@....edu.cn>
To:     emma@...olt.net, airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Yongzhi Liu <lyz_cs@....edu.cn>
Subject: [PATCH] drm/v3d: Add missing unlock

[why]
Unlock is needed on the error handling path to prevent dead lock.

[how]
Fix this by adding drm_gem_unlock_reservations on the error handling path.

Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index c7ed2e1..0c989dc 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -798,6 +798,8 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 
 		if (!render->base.perfmon) {
 			ret = -ENOENT;
+			drm_gem_unlock_reservations(last_job->bo,
+				    last_job->bo_count, &acquire_ctx);
 			goto fail;
 		}
 	}
@@ -1027,6 +1029,8 @@ v3d_submit_csd_ioctl(struct drm_device *dev, void *data,
 						     args->perfmon_id);
 		if (!job->base.perfmon) {
 			ret = -ENOENT;
+			drm_gem_unlock_reservations(clean_job->bo, clean_job->bo_count,
+						    &acquire_ctx);
 			goto fail;
 		}
 	}
-- 
2.7.4