On Wed, Jan 14, 2015 at 07:45:31AM +0100, Robert Baldyga wrote: > This patch fixes bug described here: > https://lkml.org/lkml/2014/12/22/185 > > Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx> > --- > > Changelog: > > v2: > - fixed comment from Paul Zimmerman > > v1: https://lkml.org/lkml/2015/1/13/186 > > drivers/usb/dwc2/core_intr.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c > index ad43c5b..02e3e2d 100644 > --- a/drivers/usb/dwc2/core_intr.c > +++ b/drivers/usb/dwc2/core_intr.c > @@ -476,13 +476,13 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev) > u32 gintsts; > irqreturn_t retval = IRQ_NONE; > > + spin_lock(&hsotg->lock); > + > if (!dwc2_is_controller_alive(hsotg)) { This is really, really odd. Register accesses are atomic, so the lock isn't really doing anything. Besides, you're calling dwc2_is_controller_alive() from within the IRQ handler, so IRQs are already disabled. When the problem happens, do you see this "Controller is dead" message ? -- balbi
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