linux-kernel - Re: [PATCH v2] sound: usb: mixer: increase control transfer timeout

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Message-ID: <4E5B9CB0.4090708@ladisch.de>
Date:	Mon, 29 Aug 2011 16:05:36 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Jassi Brar <jassisinghbrar@...il.com>
CC:	Felipe Balbi <balbi@...com>, 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 v2] sound: usb: mixer: increase control transfer timeout

Jassi Brar wrote:
> On Mon, Aug 29, 2011 at 6:01 PM, Felipe Balbi <balbi@...com> wrote:
> > 100ms might not be enough for slower devices. Increasing
> > timeout to 1000ms doesn't seem like overkill.
> >
> > Signed-off-by: Felipe Balbi <balbi@...com>
> > ---
> >
> > Changes since v1:
> >  . Increase all 100ms timeout to 1000ms
> >
> >  sound/usb/mixer.c        |    4 ++--
> >  sound/usb/mixer_quirks.c |   10 +++++-----
> >  2 files changed, 7 insertions(+), 7 deletions(-)

The calls in mixer_quirks.c are device-specific and known to work, so
none of them actually require a longer timeout. However, increasing
their timeout doesn't hurt either, and ...

> > +                                   buf, val_len, 1000) >= val_len) {
> > +                                   buf, val_len, 1000) >= 0) {
> > +                             !value, 0, NULL, 0, 1000);
> > +                             !value, 0, NULL, 0, 1000);
> > +                             value, index + 2, NULL, 0, 1000);
> > +                                     jacks[i].unitid << 8, buf, 3, 1000);
> > +                             50, 0, &new_status, 1, 1000);
> 
> How about also converting to use a local define for timeout value ?

... now that _all_ calls to snd_usb_ctl_msg use the same timeout value,
we could just as well drop this parameter.


Regards,
Clemens
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