Re: [PATCH] mmc: prevent dangling block device from accessingstale queues

From: Pavel Machek
Date: Wed Jun 10 2009 - 17:03:06 EST

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:
> 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.

Thanks for finding root cause of this!

(cesky, pictures)
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