On Tue, Oct 04, 2016 at 02:50:09PM -0400, Alan Stern wrote:
> On Tue, 4 Oct 2016, Bin Liu wrote:
>
> > local_irq_save() disables irq completely on non-SMP which causes the
> > hard interrupt handler unable to serve interrupts, which loses the
> > benefit that the giveback tasklet brings in usb_hcd
On Tue, 4 Oct 2016, Bin Liu wrote:
> local_irq_save() disables irq completely on non-SMP which causes the
> hard interrupt handler unable to serve interrupts, which loses the
> benefit that the giveback tasklet brings in usb_hcd_giveback_urb().
It doesn't lose all the benefit. Interrupts are sti
local_irq_save() disables irq completely on non-SMP which causes the
hard interrupt handler unable to serve interrupts, which loses the
benefit that the giveback tasklet brings in usb_hcd_giveback_urb().
One example of the issues caused by this disabling local irq is that
urb->complete in uvc driv
