Actually from my debug result, I found that before the mouse hang moment, there is still an OHCI_INTR_WDH interrupt found , but no "RET" debug message(ex. drivers/usb/host/ohci-dbg.c: RET 9800xxxxxx dev=2 ep=1in-intr flags=204 len=4/4 stat=0) appears. And after that , there is no WDH interrupt found again. That is what I say "has no response". Even the ohci_irq is triggered, I can not found the mouse WDH interrupt happens again. I have decrease the udelay time to 10us, the system works fine too , as the 100us delay. No mouse hang is happening. Should I add some debug points in which place to see what happened? Thanks, Frank -----Original Message----- From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] Sent: Tuesday, December 29, 2009 11:41 AM To: Huang, FrankR Cc: USB list Subject: RE: A question about ohci_irq() On Mon, 28 Dec 2009, Huang, FrankR wrote: > Alan, > > Thanks.I know the reason why the two irq functions are triggered > at the same time. > Below is dmesg result. > I insert a USB mouse and USB disk to the ports. > And the delay posision for ohci_irq() is : > ints = ohci_readl(ohci, ®s->intrstatus); > + udelay(100); > When the mouse is hang, the ohci_irq() has no response. What do you mean by "has no response"? Alan Stern -- 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
