Messages in this thread | | | Date | Sat, 13 Jun 2009 12:34:52 +0200 | From | Pierre Ossman <> | Subject | Re: [PATCH] MMC: Add 400ms to CAFE SD controller resume path |
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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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