From: Jean-Francois Moine <moinejf@free.fr>
To: Frank Schaefer <fschaefer.oss@googlemail.com>
Cc: linux-media@vger.kernel.org
Subject: Re: gspca-sonixj: ioctl VIDIOC_DQBUF blocks for 3s and retuns EIO
Date: Fri, 14 May 2010 08:00:49 +0200 [thread overview]
Message-ID: <20100514080049.1cf7c726@tele> (raw)
In-Reply-To: <4BEC21B9.4010605@googlemail.com>
On Thu, 13 May 2010 17:58:49 +0200
Frank Schaefer <fschaefer.oss@googlemail.com> wrote:
> I'm not sure if I'm hitting a bug or this is the expected driver
> behavior: With a Microsoft LifeCam VX-3000 (045e:00f5) and
> gspca-sonixj, ioctl VIDIOC_DQBUF intermittently blocks for exactly 3
> seconds and then returns EIO.
> I noticed that it strongly depends on the captured scenery: when it's
> changing much, everything is fine.
> But when for example capturing the wall under constant (lower) light
> conditions, I'm getting this error nearly permanently.
>
> It's a JPEG-device, so I guess the device stops sending data if the
> picture doesn't change and that's how it should be.
> But is the long blocking + EIO the way drivers should handle this
> situtation ?
Hello Frank,
You are right, this is a bug. I did not know that a webcam could suspend
streaming when the image did not change. I will remove the timeout.
Thanks.
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
next prev parent reply other threads:[~2010-05-14 6:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-13 15:58 gspca-sonixj: ioctl VIDIOC_DQBUF blocks for 3s and retuns EIO Frank Schaefer
2010-05-14 6:00 ` Jean-Francois Moine [this message]
2010-05-14 7:26 ` Hans de Goede
2010-05-14 18:44 ` Frank Schaefer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100514080049.1cf7c726@tele \
--to=moinejf@free.fr \
--cc=fschaefer.oss@googlemail.com \
--cc=linux-media@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.