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SubjectRe: sn9c10x list corruption in 2.6.18.1
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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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