I'm porting an arm board from linux-3.10 to linux-3.12 and found that I can no 
longer detect the SD card. I found that the 
wait_for_completion(&mrq->completion) in 
drivers/mmc/core/core.c:mmc_wait_for_req_done() is never returning.

I was able to bisect the problem to this commit:
0244ad004a54e39308d495fee0a2e637f8b5c317 is the first bad commit
commit 0244ad004a54e39308d495fee0a2e637f8b5c317
Author: Martin Schwidefsky <schwidef...@de.ibm.com>
Date:   Fri Aug 30 09:39:53 2013 +0200

Remove GENERIC_HARDIRQ config option

After the last architecture switched to generic hard irqs the config
options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code
for !CONFIG_GENERIC_HARDIRQS can be removed.

Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>


I'm not sure what I should do to fix the problem. Does anyone have any 
suggestions?

Thanks,
Jon Ringle--
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