On 06/26/2012 12:21 AM, DebBarma, Tarun Kanti wrote:

On Tue, Jun 26, 2012 at 2:22 AM, Franky Lin [off-list ref] wrote:

quoted

Hi Kevin, Tarun,

We are using the expansion connector A on Panda board to mount a SDIO WiFi
dongle on MMC2 with a level triggered interrupt signal connected to GPIO
138. It's been working fine until 3.5 rc1. The board hang randomly within 5
mins during a network traffic test. After bisecting we found the culprit is
"[PATCH 8/8] gpio/omap: fix missing check in *_runtime_suspend()" [1].

I noticed Kevin raised some similar cases on other platforms and also
provided two patches in the patch mail thread. But unfortunately those two
patches doesn't help in our case. I tested the driver with 3.5-rc3 mainline
kernel and the issue is still there. I can only "fix" the hang by either
reverting the commit or disabling CONFIG_PM_RUNTIME. Also, the hang only
happens on Panda ES board. Old Panda with 4430 works good.

Any thoughts and suggestions?

I just had a quick look at the code. Can you please check if the
attached patch solves
the issue? I just boot tested on Panda and Blaze.
--
Tarun

Thanks for the prompt reply.

Booting is fine even without the patch and revert. The wifi dongle 
generates interrupt whenever there is data packet available for host to 
read. So during a traffic test a significant numbers of interrupt will 
be triggered through the GPIO. So I assume it has something to do with 
the interrupt GPIO.

With the patch, the kernel still crashes. But the symptom is slightly 
different. Now it has a panic log every time. See attachment.

Regards,
Franky