Re: [PATCH v4] usb: musb: musb_cppi41: Defer probe only if DMA is not ready

[Bin Liu <b-liu-l0cyMroinI0@public.gmane.org>]

On Fri, May 19, 2017 at 04:20:35PM +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.
> 
> Signed-off-by: Alexandre Bailon <abailon-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

Applied. Thanks.
-Bin.

> ---
>  drivers/usb/musb/musb_cppi41.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
> index e7c8b1b..ba25528 100644
> --- a/drivers/usb/musb/musb_cppi41.c
> +++ b/drivers/usb/musb/musb_cppi41.c
> @@ -673,12 +673,15 @@ 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: %d.\n",
> +					str, ret);
>  			goto err;
>  		}
> +
>  		cppi41_channel->dc = dc;
>  	}
>  	return 0;
> -- 
> 2.10.2
> 
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