[PATCH v3] usb: musb: musb_cppi41: Update an error message

[PATCH v3] usb: musb: musb_cppi41: Update an error message

[Alexandre Bailon]

If dma_request_slave_channel() failed to return a channel,
then the driver will print an error and request to defer probe,
regardless of the cause of the failure.
Defer if the DMA is not ready yet otherwise print an error.

Signed-off-by: Alexandre Bailon <abailon-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
---
 drivers/usb/musb/musb_cppi41.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index e7c8b1b..2c6ad93 100644
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -673,12 +673,14 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
 		musb_dma->status = MUSB_DMA_STATUS_FREE;
 		musb_dma->max_len = SZ_4M;
 
-		dc = dma_request_slave_channel(dev->parent, str);
-		if (!dc) {
-			dev_err(dev, "Failed to request %s.\n", str);
-			ret = -EPROBE_DEFER;
+		dc = dma_request_chan(dev->parent, str);
+		if (IS_ERR(dc)) {
+			ret = PTR_ERR(dc);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Failed to request %s.\n", str);
 			goto err;
 		}
+
 		cppi41_channel->dc = dc;
 	}
 	return 0;
-- 
2.10.2

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v3] usb: musb: musb_cppi41: Update an error message

[Johan Hovold]

On Fri, May 19, 2017 at 03:27:47PM +0200, Alexandre Bailon wrote:
> If dma_request_slave_channel() failed to return a channel,
> then the driver will print an error and request to defer probe,
> regardless of the cause of the failure.
> Defer if the DMA is not ready yet otherwise print an error.

The patch summary (Subject) doesn't really reflect what you're doing
here (only deferring probe when actually requested).

But the patch itself otherwise looks good now.

> Signed-off-by: Alexandre Bailon <abailon-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>

With a more descriptive summary you can add my:

Reviewed-by: Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

> ---
>  drivers/usb/musb/musb_cppi41.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
> index e7c8b1b..2c6ad93 100644
> --- a/drivers/usb/musb/musb_cppi41.c
> +++ b/drivers/usb/musb/musb_cppi41.c
> @@ -673,12 +673,14 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
>  		musb_dma->status = MUSB_DMA_STATUS_FREE;
>  		musb_dma->max_len = SZ_4M;
>  
> -		dc = dma_request_slave_channel(dev->parent, str);
> -		if (!dc) {
> -			dev_err(dev, "Failed to request %s.\n", str);
> -			ret = -EPROBE_DEFER;
> +		dc = dma_request_chan(dev->parent, str);
> +		if (IS_ERR(dc)) {
> +			ret = PTR_ERR(dc);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "Failed to request %s.\n", str);

Perhaps also include the errno here now?

>  			goto err;
>  		}
> +
>  		cppi41_channel->dc = dc;
>  	}
>  	return 0;

Thanks,
Johan
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html