linux-kernel - Re: 2.6.33 bugs (USBFS, Intel graphic)

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Message-ID: <d9def9db1002262005t6d63b902s673fb01dac228e4d@mail.gmail.com>
Date:	Sat, 27 Feb 2010 05:05:41 +0100
From:	Markus Rechberger <mrechberger@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	werner@...ane.dyn-o-saur.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Marcus Meissner <meissner@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.33 bugs (USBFS, Intel graphic)

On Sat, Feb 27, 2010 at 4:56 AM, Greg KH <greg@...ah.com> wrote:
> On Sat, Feb 27, 2010 at 04:42:53AM +0100, Markus Rechberger wrote:
>> * http://lkml.org/lkml/2010/2/19/192
>> .6.32-stable review patch.  If anyone has any objections, please let us know.
>>
>> ------------------
>> From: Greg KH <greg@...ah.com>
>>
>> commit d4a4683ca054ed9917dfc9e3ff0f7ecf74ad90d6 upstream.
>>
>> We need to only copy the data received by the device to userspace, not
>> the whole kernel buffer, which can contain "stale" data.
>>
>> Thanks to Marcus Meissner for pointing this out and testing the fix.
>>
>> Reported-by: Marcus Meissner <meissner@...e.de>
>> Tested-by: Marcus Meissner <meissner@...e.de>
>> Cc: Alan Stern <stern@...land.harvard.edu>
>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>>
>>
>> this patch breaks isochronous USBFS support, please revert that patch!
>>
>> http://sundtek.de/images/tvtime-bildfehler.jpg
>>
>> with the patch reverted:
>> http://sundtek.de/images/tvtime-working.png
>>
>> * Intel graphic flickers now
>
> That is very strange.  What userspace program is using usbfs for video
> feeds?  And why would it be relying on the invalid data on the end of an
> urb?
>

there are 2 userspace videowrapper available for linux and freebsd
which do videoprocessing in userland rather than in kernelspace.
Well isochronous works slightly different than BULK transfer (which I
guess was tested)
urb->iso_frame_desc[i].actual_length
each microframe has it's own length field for ISO.

Markus
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