releases/5.16.20/drm-v3d-fix-missing-unlock.patch

From c73eef3268d69437dea4163991b76a8d405da203 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 28 Jan 2022 05:41:02 -0800
Subject: drm/v3d: fix missing unlock

From: Yongzhi Liu <lyz_cs@pku.edu.cn>

[ Upstream commit e57c1a3bd5e8e0c7181f65ae55581f0236a8f284 ]

[why]
Unlock is needed on the error handling path to prevent dead lock.
v3d_submit_cl_ioctl and v3d_submit_csd_ioctl is missing unlock.

[how]
Fix this by changing goto target on the error handling path. So
changing the goto to target an error handling path
that includes drm_gem_unlock reservations.

Signed-off-by: Yongzhi Liu <lyz_cs@pku.edu.cn>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1643377262-109975-1-git-send-email-lyz_cs@pku.edu.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index e47ae40a865a..91bdec3e0ef7 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -798,7 +798,7 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 
 		if (!render->base.perfmon) {
 			ret = -ENOENT;
-			goto fail;
+			goto fail_perfmon;
 		}
 	}
 
@@ -847,6 +847,7 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 
 fail_unreserve:
 	mutex_unlock(&v3d->sched_lock);
+fail_perfmon:
 	drm_gem_unlock_reservations(last_job->bo,
 				    last_job->bo_count, &acquire_ctx);
 fail:
@@ -1027,7 +1028,7 @@ v3d_submit_csd_ioctl(struct drm_device *dev, void *data,
 						     args->perfmon_id);
 		if (!job->base.perfmon) {
 			ret = -ENOENT;
-			goto fail;
+			goto fail_perfmon;
 		}
 	}
 
@@ -1056,6 +1057,7 @@ v3d_submit_csd_ioctl(struct drm_device *dev, void *data,
 
 fail_unreserve:
 	mutex_unlock(&v3d->sched_lock);
+fail_perfmon:
 	drm_gem_unlock_reservations(clean_job->bo, clean_job->bo_count,
 				    &acquire_ctx);
 fail:
-- 
2.35.1