Hi Dan, On 2018-12-06 15:52, Dan Carpenter wrote: > Hi Marek, > > I'm surprised you don't get deadlocks when you apply this patch. Why should I get it? It is just a revert to the state before applying the mentioned incorrect patch. > On Wed, Nov 21, 2018 at 04:45:04PM +0100, Marek Szyprowski wrote: > >> @@ -4020,9 +4008,7 @@ static int dwc2_hsotg_ep_disable(struct usb_ep *ep) >> >> epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); >> >> - locked = spin_is_locked(&hsotg->lock); >> - if (!locked) >> - spin_lock_irqsave(&hsotg->lock, flags); >> + spin_lock_irqsave(&hsotg->lock, flags); >> > One of the callers is already holding the hsotg->log. The > spin_is_locked() test would avoid the deadlock. Before that broken patch, there was no call to any function which takes spinlock again, so no deadlock. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
