linux-kernel - [PATCH 1/3] media: staging: rkisp1: cap: fix return values from pm functions

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Date:   Thu, 12 Mar 2020 22:46:24 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     linux-media@...r.kernel.org
Cc:     mchehab@...nel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org, linux-rockchip@...ts.infradead.org,
        hans.verkuil@...co.com, kernel@...labora.com,
        Helen Koike <helen.koike@...labora.com>
Subject: [PATCH 1/3] media: staging: rkisp1: cap: fix return values from pm functions

If no errors occurs, pm functions return usage counters, so they can
return positive numbers.
This happens when streaming from multiple capture devices (mainpath and
selfpath).

Fix simultaneous streaming from mainpath and selfpath by not failing
when pm usage counters returns a positive number.

Signed-off-by: Helen Koike <helen.koike@...labora.com>
---

 drivers/staging/media/rkisp1/rkisp1-capture.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/rkisp1/rkisp1-capture.c b/drivers/staging/media/rkisp1/rkisp1-capture.c
index 524e0dd38c1b..97091e5a6e6c 100644
--- a/drivers/staging/media/rkisp1/rkisp1-capture.c
+++ b/drivers/staging/media/rkisp1/rkisp1-capture.c
@@ -938,11 +938,11 @@ static void rkisp1_vb2_stop_streaming(struct vb2_queue *queue)
 	rkisp1_return_all_buffers(cap, VB2_BUF_STATE_ERROR);
 
 	ret = v4l2_pipeline_pm_use(&node->vdev.entity, 0);
-	if (ret)
+	if (ret < 0)
 		dev_err(rkisp1->dev, "pipeline close failed error:%d\n", ret);
 
 	ret = pm_runtime_put(rkisp1->dev);
-	if (ret)
+	if (ret < 0)
 		dev_err(rkisp1->dev, "power down failed error:%d\n", ret);
 
 	rkisp1_dummy_buf_destroy(cap);
@@ -995,12 +995,12 @@ rkisp1_vb2_start_streaming(struct vb2_queue *queue, unsigned int count)
 		goto err_ret_buffers;
 
 	ret = pm_runtime_get_sync(cap->rkisp1->dev);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(cap->rkisp1->dev, "power up failed %d\n", ret);
 		goto err_destroy_dummy;
 	}
 	ret = v4l2_pipeline_pm_use(entity, 1);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(cap->rkisp1->dev, "open cif pipeline failed %d\n", ret);
 		goto err_pipe_pm_put;
 	}
-- 
2.25.0