linux-kernel - Re: [PATCH] mmc: prevent dangling block device from accessing stale queues

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Date:	Tue, 23 Jun 2009 17:01:14 +0200
From:	Stefan Bader <stefan.bader@...onical.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, pierre@...man.eu,
	linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] mmc: prevent dangling block device from accessing stale 
	queues

I did not see any news related to this issue. Pierre, are you waiting
on more info from my side? Or did I miss a change somewhere else?

Stefan


> On Thu 2009-06-04 20:00:52, Stefan Bader wrote:
>> Kernel: 2.6.30-rc7 based
>> Worked in 2.6.28 (probably only because things went at a different speed)
>>
>> Testcase: Use ext3/ext4 on a SD card partitioned with one primary DOS
>> partition and leave it mounted while suspend/resume.
>>
>> Result: After resume the partition table of the SD card has been erased.
>>
>> The detailed description can be found at:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/383668
>>
>> In essence the mmc block device frees the generic request queue before
>> the last user of the gendisk has stopped using it leaving an invalid
>> queue pointer which get unfortunately re-used before more requests come
>> in for the old device.
>>
>> The bugfix will cause more I/O error messages and might not be the
>> ultimate way things should work, but it prevents data from getting lost.
>
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