linux-kernel - [PATCH] drm/v3d: fix runtime pm imbalance on error

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Message-Id: <20200520120751.3533-1-dinghao.liu@zju.edu.cn>
Date:   Wed, 20 May 2020 20:07:51 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/v3d: fix runtime pm imbalance on error

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 549dde83408b..d53c683ed74c 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -440,8 +440,10 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv,
 	job->free = free;
 
 	ret = pm_runtime_get_sync(v3d->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_autosuspend(v3d->dev);
 		return ret;
+	}
 
 	xa_init_flags(&job->deps, XA_FLAGS_ALLOC);
 
-- 
2.17.1