linux-kernel - [stable 4.19+][PATCH 06/20] media: stm32-dcmi: fix check of pm_runtime_get

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Date:   Fri, 15 Nov 2019 15:33:42 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [stable 4.19+][PATCH 06/20] media: stm32-dcmi: fix check of pm_runtime_get_sync return value

From: Hugues Fruchet <hugues.fruchet@...com>

commit ab41b99e7e55c85f29ff7b54718ccbbe051905e7 upstream

Start streaming was sometimes failing because of pm_runtime_get_sync()
non-0 return value. In fact return value was not an error but a
positive value (1), indicating that PM was already enabled.
Fix this by going to error path only with negative return value.

Signed-off-by: Hugues Fruchet <hugues.fruchet@...com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc: stable <stable@...r.kernel.org> # 4.19+
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/media/platform/stm32/stm32-dcmi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index d86944109cbf..18d0b5641789 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -584,9 +584,9 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 	int ret;
 
 	ret = pm_runtime_get_sync(dcmi->dev);
-	if (ret) {
-		dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync\n",
-			__func__);
+	if (ret < 0) {
+		dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
+			__func__, ret);
 		goto err_release_buffers;
 	}
 
-- 
2.17.1