linux-kernel - Re: [patch] floppy: suspend/resume fix

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Date:	Sun, 12 Nov 2006 23:58:06 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	7eggert@....de, akpm@...l.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: [patch] floppy: suspend/resume fix

On Sun, Nov 12, 2006 at 11:40:28PM +0100, Mikael Pettersson wrote:
> The bug occurs regardless of whether I leave the floppy disc in the drive
> during suspend or not. 2.6.19-rc5 (vanilla and with Ingo's suspend/resume
> hooks) fails the following use case as well:
> 
> 1. boot
> 2. insert floppy disc
> 3. tar tvf /dev/fd0 (works)
> 4. manually eject floppy disc
> 5. suspend, later resume 
> 6. insert floppy disc
> 7. tar tvf /dev/fd0 (fails with I/O errors)
> 8. tar tvf /dev/fd0 (works)
> 
> Like Ingo said, something happens to the HW during suspend and we
> need to figure out how to reinitialise the HW and the driver so that
> things work immediately after resume.

Now this is interesting - I know there's been a long standing bug with
kernels on my Thinkpad which behave in a similar way to your description
above.  Basically whenever I change the disk in the drive I tend to need
_two_ goes to do anything with it - the first mostly always fails with
IO errors.

I've not bothered to report it because it runs a _very_ old 2.6 kernel
and upgrading the machine to something modern would be extremely painful
(read - would need new hard drive, and probably more RAM than the laptop
can take.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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