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SubjectRe: [PATCH] MMC: Add 400ms to CAFE SD controller resume path
On Thu, 4 Jun 2009 23:33:49 +0000
Deepak Saxena <dsaxena@plexity.net> wrote:

>
> The request is not ending up in the queue of the new device. If I
> recall correctyl What is happening is that userspace does an unmount on the
> old device when it receives the notification that it is gone (since it is not
> redected and a new entry is created). By the time that unmount is called, the
> various data structures for the device has been zeroed out but the various
> operation pointers are !NULL, so when we go back to write the superblock for
> the mounted partition, we overwrite the device's partition table as the
> partition offset is now 0. The main issue here is that the kernel is allowing
> an I/O to a device that is technically still there but not from the kernel's
> POV.

But if the device is not there from the kernel's POV then it should be
impossible to write to it. It seems this is a kernel bug though. See
this thread:

http://marc.info/?t=124413860500006&r=1&w=2

Rgds
--
-- Pierre Ossman

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