Hello. I'm developing on Samsung s3c2443 CPU and now my aim is to make suspend mode working properly. My kernel version is 3.6. Everything was OK, however Linux hanged on resume, if usb ohci driver was loaded. My investigation showed, that it hangs on msleep function, that is getting called in ohci_run() function in drivers/usb/host/ohci-hcd.c file. Exact line of code is [1]. I found on the web, that there was [2] similar problem on s3c2410. The reason of hang is that msleep locks the only working thread in system, and nobody can unlock it. The simple workaround is to replace msleep with mdelay. But the usage of msleep is in platform-independent usb-ohci code. That means, that other platforms somehow bypass this problem, and work with msleep correctly. But I will prefer to fix it in platform-depended, than to make workaround in common code. What bugs in platform-depended code could lead to such problem? I suggest, that there is some problem with sequence of resume actions, and usb resume happens much earlier, than it have to. But where exactly should I search for the problem? Thanks, Alexander. [1] http://lxr.free-electrons.com/source/drivers/usb/host/ohci-hcd.c?v=3.6;a=arm#L621 [2] http://osdir.com/ml/handhelds.openmoko.kernel/2008-05/msg00168.html -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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