[PATCH -next] media: rcar_drif: fix error return code in rcar_drif_alloc_dmachannels()

[PATCH -next] media: rcar_drif: fix error return code in rcar_drif_alloc_dmachannels()

[Wei Yongjun]

Fix to return error code -ENODEV from the dma_request_slave_channel()
error handling case instead of 0, as done elsewhere in this function.
rc can be overwrite to 0 by dmaengine_slave_config() in the for loop.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
---
 drivers/media/platform/rcar_drif.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
index b2e080e..dc7e280 100644
--- a/drivers/media/platform/rcar_drif.c
+++ b/drivers/media/platform/rcar_drif.c
@@ -274,7 +274,7 @@ static int rcar_drif_alloc_dmachannels(struct rcar_drif_sdr *sdr)
 {
 	struct dma_slave_config dma_cfg;
 	unsigned int i;
-	int ret = -ENODEV;
+	int ret;
 
 	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
 		struct rcar_drif *ch = sdr->ch[i];
@@ -282,6 +282,7 @@ static int rcar_drif_alloc_dmachannels(struct rcar_drif_sdr *sdr)
 		ch->dmach = dma_request_slave_channel(&ch->pdev->dev, "rx");
 		if (!ch->dmach) {
 			rdrif_err(sdr, "ch%u: dma channel req failed\n", i);
+			ret = -ENODEV;
 			goto dmach_error;
 		}

Re: [PATCH -next] media: rcar_drif: fix error return code in rcar_drif_alloc_dmachannels()

[Sergei Shtylyov]

Hello!

On 01/17/2018 02:24 PM, Wei Yongjun wrote:

> Fix to return error code -ENODEV from the dma_request_slave_channel()
> error handling case instead of 0, as done elsewhere in this function.
> rc can be overwrite to 0 by dmaengine_slave_config() in the for loop.

    Overwritten.

> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
[...]

MBR, Sergei

Re: [PATCH -next] media: rcar_drif: fix error return code in rcar_drif_alloc_dmachannels()

[Geert Uytterhoeven]

On Wed, Jan 17, 2018 at 12:24 PM, Wei Yongjun <weiyongjun1@huawei.com> wrote:
> Fix to return error code -ENODEV from the dma_request_slave_channel()
> error handling case instead of 0, as done elsewhere in this function.
> rc can be overwrite to 0 by dmaengine_slave_config() in the for loop.
>
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

RE: [PATCH -next] media: rcar_drif: fix error return code in rcar_drif_alloc_dmachannels()

[Ramesh Shanmugasundaram]

Hi Wei Yongjun,

Thank you for the patch.

> Subject: [PATCH -next] media: rcar_drif: fix error return code in
> rcar_drif_alloc_dmachannels()
> 
> Fix to return error code -ENODEV from the dma_request_slave_channel()
> error handling case instead of 0, as done elsewhere in this function.
> rc can be overwrite to 0 by dmaengine_slave_config() in the for loop.
> 
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>

Reviewed-by: Ramesh Shanmugasundaram <Ramesh.shanmugasundaram@bp.renesas.com>

Thanks,
Ramesh

> ---
>  drivers/media/platform/rcar_drif.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/rcar_drif.c
> b/drivers/media/platform/rcar_drif.c
> index b2e080e..dc7e280 100644
> --- a/drivers/media/platform/rcar_drif.c
> +++ b/drivers/media/platform/rcar_drif.c
> @@ -274,7 +274,7 @@ static int rcar_drif_alloc_dmachannels(struct
> rcar_drif_sdr *sdr)  {
>  	struct dma_slave_config dma_cfg;
>  	unsigned int i;
> -	int ret = -ENODEV;
> +	int ret;
> 
>  	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
>  		struct rcar_drif *ch = sdr->ch[i];
> @@ -282,6 +282,7 @@ static int rcar_drif_alloc_dmachannels(struct
> rcar_drif_sdr *sdr)
>  		ch->dmach = dma_request_slave_channel(&ch->pdev->dev, "rx");
>  		if (!ch->dmach) {
>  			rdrif_err(sdr, "ch%u: dma channel req failed\n", i);
> +			ret = -ENODEV;
>  			goto dmach_error;
>  		}