linux-kernel - [PATCH 5.14 257/432] media: imx: imx7-media-csi: Fix buffer return upon stream start failure

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Message-Id: <20210916155819.531823738@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 18:00:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Martin Kepplinger <martin.kepplinger@...i.sm>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 257/432] media: imx: imx7-media-csi: Fix buffer return upon stream start failure

From: Laurent Pinchart <laurent.pinchart@...asonboard.com>

[ Upstream commit 0ada1697ed4256b38225319c9896661142a3572d ]

When the stream fails to start, the first two buffers in the queue have
been moved to the active_vb2_buf array and are returned to vb2 by
imx7_csi_dma_unsetup_vb2_buf(). The function is called with the buffer
state set to VB2_BUF_STATE_ERROR unconditionally, which is correct when
stopping the stream, but not when the start operation fails. In that
case, the state should be set to VB2_BUF_STATE_QUEUED. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Tested-by: Martin Kepplinger <martin.kepplinger@...i.sm>
Reviewed-by: Rui Miguel Silva <rmfrfs@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/media/imx/imx7-media-csi.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index 894c4de31790..2882964b8513 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -361,6 +361,7 @@ static void imx7_csi_dma_unsetup_vb2_buf(struct imx7_csi *csi,
 
 			vb->timestamp = ktime_get_ns();
 			vb2_buffer_done(vb, return_status);
+			csi->active_vb2_buf[i] = NULL;
 		}
 	}
 }
@@ -386,9 +387,10 @@ static int imx7_csi_dma_setup(struct imx7_csi *csi)
 	return 0;
 }
 
-static void imx7_csi_dma_cleanup(struct imx7_csi *csi)
+static void imx7_csi_dma_cleanup(struct imx7_csi *csi,
+				 enum vb2_buffer_state return_status)
 {
-	imx7_csi_dma_unsetup_vb2_buf(csi, VB2_BUF_STATE_ERROR);
+	imx7_csi_dma_unsetup_vb2_buf(csi, return_status);
 	imx_media_free_dma_buf(csi->dev, &csi->underrun_buf);
 }
 
@@ -537,9 +539,10 @@ static int imx7_csi_init(struct imx7_csi *csi)
 	return 0;
 }
 
-static void imx7_csi_deinit(struct imx7_csi *csi)
+static void imx7_csi_deinit(struct imx7_csi *csi,
+			    enum vb2_buffer_state return_status)
 {
-	imx7_csi_dma_cleanup(csi);
+	imx7_csi_dma_cleanup(csi, return_status);
 	imx7_csi_init_default(csi);
 	imx7_csi_dmareq_rff_disable(csi);
 	clk_disable_unprepare(csi->mclk);
@@ -702,7 +705,7 @@ static int imx7_csi_s_stream(struct v4l2_subdev *sd, int enable)
 
 		ret = v4l2_subdev_call(csi->src_sd, video, s_stream, 1);
 		if (ret < 0) {
-			imx7_csi_deinit(csi);
+			imx7_csi_deinit(csi, VB2_BUF_STATE_QUEUED);
 			goto out_unlock;
 		}
 
@@ -712,7 +715,7 @@ static int imx7_csi_s_stream(struct v4l2_subdev *sd, int enable)
 
 		v4l2_subdev_call(csi->src_sd, video, s_stream, 0);
 
-		imx7_csi_deinit(csi);
+		imx7_csi_deinit(csi, VB2_BUF_STATE_ERROR);
 	}
 
 	csi->is_streaming = !!enable;
-- 
2.30.2