Re: [PATCH] [MMC] Use own work queue

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On 10/1/06, Pierre Ossman <[email protected]> wrote:
The MMC layer uses the standard work queue for doing card detection. As
this queue is shared with other crucial subsystems, the effects of a long
(and perhaps buggy) detection can cause the system to be unusable. E.g. the
keyboard stops working while the detection routine is running.

The solution is to add a specific mmc work queue to run the detection code
in. This is similar to how other subsystems handle detection (a full
kernel thread is the most common theme).

Signed-off-by: Pierre Ossman <[email protected]>

This patch makes pxamci stop working for me on a HTC Magician (PXA272).
Switching from 2.6.18 to 2.6.19-rc1 I got a kernel panic:

mmc0: clock 0Hz busmode 1 powermode 0 cs 0  Vdd 0 width 0
PXAMCI: clkrt = 0 cmdat = 0
VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

After removing this patch from 2.6.19-rc1, everything is working again.
Are there any changes to pxamci.c needed to be compatible with it?

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