linux-kernel - Re: sn9c10x list corruption in 2.6.18.1

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Message-Id: <200610231337.48203.luca.risolia@studio.unibo.it>
Date:	Mon, 23 Oct 2006 13:37:47 +0200
From:	Luca Risolia <luca.risolia@...dio.unibo.it>
To:	teunis <teunis@...tersgift.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sn9c10x list corruption in 2.6.18.1

Alle 04:35, lunedì 23 ottobre 2006, teunis ha scritto:
> Luca Risolia wrote:
> > Alle 20:15, domenica 22 ottobre 2006, Dave Jones ha scritto:
> >> But it only happens when the user unplugs the camera, and no other
> >> webcam driver seems to be affected by this problem.
> >
> > Simply unplugging the camera does not reproduce any problem here. This is
> > the first time I see this bug.
> >
> >> That's fairly conclusive to me that the driver is misbehaving.
> >
> > I do not think this implication is correct, as not all the drivers are
> > implemented the same way and run under the same kernel configurations.
> >
> > The code in the driver seems to be okay to me.
> >
> 
> I've seen crashes (rock solid - system halted, following a core dump)
> occasionally when unplugging this device:

Could you test the version I maintain out of the tree?
http://www.linux-projects.org/modules/mydownloads/visit.php?cid=2&lid=44

I see the driver has been patched in the latest kernels and I didn't have
the time to review and test the new code.

Best regards
Luca


> sn9c102: V4L2 driver for SN9C10x PC Camera Controllers v1:1.27
> usb 2-1: SN9C10[12] PC Camera Controller detected (vid/pid 0x0C45/0x6005)
> usb 2-1: TAS5110C1B image sensor detected
> usb 2-1: Initialization succeeded
> usb 2-1: V4L2 device registered as /dev/video0
> usbcore: registered new interface driver sn9c102
> 
> It crashed 100% with 2.6.19-rc1-git6.  2.6.19-rc2-mm2: it only crashes
> occasionally (1/10 times) making me suspect a lock issue.   Haven't the
> foggiest where to look and as I only tested this hardware on a whim,
> it's not high enough priority for me to debug.   I'm also so rusty on
> drivers that my eyes would probably be of no help.
> 
> I can duplicate this on several different systems - but they're all
> EHCI-based USB2 hosts.  (Intel Corporation 82801DB/DBM on this laptop)
> Maybe that helps.
> 
> - Teunis
> 
> 
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