when i say it hangs i mean the entire system locks up not just my process. I was connected over SSH (the physical ethernet not USB ethernet) and it stops responding to pings entirely. I also tried with it hooked up to a monitor and keyboard, and it is totally unresponsive to keypresses as well. This was on multiple kernel versions. (3.12.0 most recently) On Fri, Dec 6, 2013 at 4:10 PM, Felipe Balbi <balbi@xxxxxx> wrote: > Hi, > > On Fri, Dec 06, 2013 at 04:08:21PM -0500, palesius . wrote: >> In working on a project (http://github.com/dominicgs/USBProxy) we ran >> across an issue where io on endpoint 0 would cause the system to hang. >> >> We made the following change which resolved the problem for us. I'm >> not sure if this is the "correct" fix, or if the problem is specific >> to our platform BeagleBone Black with a musb-hrdc controller. >> >> --- inode.c 2013-11-18 14:46:25.255029000 -0500 >> +++ inode.c2 2013-11-19 06:30:36.579029000 -0500 >> @@ -679,7 +679,9 @@ >> req->length = len; >> req->complete = ep_aio_complete; >> req->context = iocb; >> + spin_unlock_irq(&epdata->dev->lock); >> value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC); >> + spin_lock_irq(&epdata->dev->lock); > > usb_ep_queue() should be able to be called from atomic. Do you have some > dumps of the problem ? when BBB hangs, can you dump the stack ? (If > you're using minicom -> CTRL + A + F + P should work). > > cheers > > -- > balbi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
