Unable to access mounted sd card partition on resume from hibernate

Unable to access mounted sd card partition on resume from hibernate

[AYAN KUMAR HALDER]

Hi All,

I am working on a ARM based custom platform which has a mmc controller
(by Designware.) The mmc controller driver is dw-mmc.c.

On kernel bootup, I insert the driver and then I mount the mmc device
on /mnt. I am able to perform file-system operation(ls, cp, mv, rm) on
/mnt. Then without unmount, I hibernate my board (echo disk >
/sys/power/state).
On resuming, when I try to access /mnt , I get errors as follows:-
 # ls /mnt/
[  201.509858] FAT-fs (mmcblk0): Directory bread(block 32768) failed
[  201.516045] FAT-fs (mmcblk0): Directory bread(block 32769) failed
[  201.522163] FAT-fs (mmcblk0): Directory bread(block 32770) failed
[  201.528301] FAT-fs (mmcblk0): Directory bread(block 32771) failed
[  201.534404] FAT-fs (mmcblk0): Directory bread(block 32772) failed
[  201.540531] FAT-fs (mmcblk0): Directory bread(block 32773) failed
[  201.546658] FAT-fs (mmcblk0): Directory bread(block 32774) failed

Please tell me the reason for such errors. When I do the same sequence
of operations for a usb device, I do not get such errors. I am able to
access(after resume) the mounted partition of usb device normally.

Regards,
Ayan Kumar Halder

Unable to access mounted sd card partition on resume from hibernate

[Valdis.Kletnieks at vt.edu]

On Fri, 13 Jun 2014 12:37:18 +0530, AYAN KUMAR HALDER said:

> [  201.509858] FAT-fs (mmcblk0): Directory bread(block 32768) failed

That smells suspiciously like the driver failing to properly re-init
the card when powering back up from a resume....
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Unable to access mounted sd card partition on resume from hibernate

[AYAN KUMAR HALDER]

On Fri, Jun 13, 2014 at 7:22 PM,  <Valdis.Kletnieks@vt.edu> wrote:
> On Fri, 13 Jun 2014 12:37:18 +0530, AYAN KUMAR HALDER said:
>
>> [  201.509858] FAT-fs (mmcblk0): Directory bread(block 32768) failed
>
> That smells suspiciously like the driver failing to properly re-init
> the card when powering back up from a resume....

I forgot to add that on resuming, when I access /mnt partition , I get
the "FAT-fs" errors as described above. Then I umount and mount the
mmc device, I am able to access the mounted device.
But my question still remains as why the mounted partition of mmc is
in-accessible on resume and why does it become accessible when I
unmount and remount the mmc.