linux-kernel - Re: Problems with reading DVD using 2.6.21.5

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Message-id: <46AB6ED2.9050509@shaw.ca>
Date:	Sat, 28 Jul 2007 10:29:06 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Manuel Reimer <Manuel.Spam@...fuerspam.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Problems with reading DVD using 2.6.21.5

Manuel Reimer wrote:
> Hello,
> 
> I tried to reproduce this bug by mounting/unmounting the drive several 
> times.
> 
> It seems like this problem is caused, if the drive is at speed 0 after 
> some time without access. In this situation, sometimes the drive seems 
> to take a bit longer to speed up. Whenever it takes a bit longer, I get 
> the error in dmesg and parts of the mounted disc are unreadable...
> 
> Any chance to get this debugged?

It's not entirely clear to me whether the kernel is doing any retries or 
not. It likely should be, but somebody more familiar with the block 
layer would likely have to answer whether it will be or not..

Certainly if we are already retrying and the drive keeps saying "no seek 
complete" there's not much the kernel can do about it..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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