On Tue, Jun 26, 2012 at 11:50 PM, Franky Lin <frankyl@xxxxxxxxxxxx> wrote: > On 06/26/2012 12:21 AM, DebBarma, Tarun Kanti wrote: >> >> On Tue, Jun 26, 2012 at 2:22 AM, Franky Lin <frankyl@xxxxxxxxxxxx> wrote: >>> >>> 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. I tried comparing the present code with older version with regard to enabled_non_wakeup_gpios check. The obvious difference I observed is that this check is performed after off-mode check, unlike the present case where the check is done just prior to off-mode check. But then, as Kevin pointed out, we need to understand the exact problem. I am trying to have a setup to reproduce the problem. BTW, you can ignore my patch because I realized that saved_datain is part of the workaround. --- Tarun > > Regards, > Franky -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
