gspca-sonixj: ioctl VIDIOC_DQBUF blocks for 3s and retuns EIO

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Hi,

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 ?

Regards,
Frank Schaefer

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