linux-kernel - Re: [PATCH] sound: usb: mixer: increase control transfer timeout

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Date:	Mon, 29 Aug 2011 13:58:31 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Felipe Balbi <balbi@...com>
CC:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Linux USB Mailing List <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] sound: usb: mixer: increase control transfer timeout

Felipe Balbi wrote:
> 100ms might not be enough for slower devices. Increasing
> timeout to 1000ms doesn't seem like overkill.
> 
> --- a/sound/usb/mixer.c
> +++ b/sound/usb/mixer.c
> @@ -296,7 +296,7 @@ static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int v
>  		if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
>  				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
>  				    validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
> -				    buf, val_len, 100) >= val_len) {
> +				    buf, val_len, 1000) >= val_len) {

If the timeout for reading values needs to be increased, writing (in
snd_usb_mixer_set_ctl_value) probably needs some attention too.


Regards,
Clemens
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