On Thu, Aug 22, 2013 at 4:58 PM, Ming Lei <ming....@canonical.com> wrote: > On Wed, Aug 21, 2013 at 11:23 PM, Alan Stern <st...@rowland.harvard.edu> > wrote: >> I'm starting to think that moving the entire handler to a tasklet would >> have been better. > > Not sure, if so: > > - one thing is that the HCD private lock can't be held in interrupt handler > any > more, so new lock need to introduce, not mention each hard irq handler need to > split to two parts.
Also one potential big problem of moving entire handler to tasklet is the hardware race, previously the entire hander is run with interrupt disabled and the big HCD private lock held, but after the conversion, both are not true, so each HCD change for this conversion might be big. If only moving giveback into tasklet, there is no such problem. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
