Message-ID: <453C2A57.2030305@wintersgift.com>
Date: Sun, 22 Oct 2006 19:35:03 -0700
From: teunis <teunis@wintersgift.com>
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To: Luca Risolia <luca.risolia@studio.unibo.it>, linux-kernel@vger.kernel.org
Subject: Re: sn9c10x list corruption in 2.6.18.1
References: <20061022031145.GA24855@redhat.com> <200610221346.53038.luca.risolia@studio.unibo.it> <20061022181539.GD27152@redhat.com> <200610222322.46703.luca.risolia@studio.unibo.it>
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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:
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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