linux-kernel - [PATCH v2] media: xilinx: Use dma_request_chan() instead dma_request_slave

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Date:   Fri, 10 Jan 2020 09:16:48 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <mchehab@...nel.org>, <hyun.kwon@...inx.com>,
        <laurent.pinchart@...asonboard.com>
CC:     <vkoul@...nel.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <michal.simek@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2] media: xilinx: Use dma_request_chan() instead dma_request_slave_channel()

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
Hi,

Changes since v1:
- Fix cleanup path when DMA request failed as suggested by Laurent
- Print error only in case when the error is not EPROBE_DEFER

Regards,
Peter

 drivers/media/platform/xilinx/xilinx-dma.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
index b211380a11f2..3bb54a4db6a4 100644
--- a/drivers/media/platform/xilinx/xilinx-dma.c
+++ b/drivers/media/platform/xilinx/xilinx-dma.c
@@ -725,10 +725,11 @@ int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
 
 	/* ... and the DMA channel. */
 	snprintf(name, sizeof(name), "port%u", port);
-	dma->dma = dma_request_slave_channel(dma->xdev->dev, name);
-	if (dma->dma == NULL) {
-		dev_err(dma->xdev->dev, "no VDMA channel found\n");
-		ret = -ENODEV;
+	dma->dma = dma_request_chan(dma->xdev->dev, name);
+	if (IS_ERR(dma->dma)) {
+		ret = PTR_ERR(dma->dma);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dma->xdev->dev, "no VDMA channel found\n");
 		goto error;
 	}
 
@@ -752,7 +753,7 @@ void xvip_dma_cleanup(struct xvip_dma *dma)
 	if (video_is_registered(&dma->video))
 		video_unregister_device(&dma->video);
 
-	if (dma->dma)
+	if (!IS_ERR_OR_NULL(dma->dma))
 		dma_release_channel(dma->dma);
 
 	media_entity_cleanup(&dma->video.entity);
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki