On Mon, Apr 28, 2014 at 11:25 AM, Alan Stern <st...@rowland.harvard.edu> wrote:
> On Fri, 25 Apr 2014, Dan Williams wrote:
>
>> >> @@ -4892,11 +4897,17 @@ static void hub_events(void)
>> >>
>> >> /* deal with port status changes */
>> >> for (i = 1; i <= hdev->maxchild; i++) {
>> >> + struct usb_port *port_dev = hub->ports[i - 1];
>> >> +
>> >> if (!test_bit(i, hub->busy_bits)
>> >> && (test_and_clear_bit(i,
>> >> hub->event_bits)
>> >> || test_bit(i,
>> >> hub->change_bits)
>> >> - || test_bit(i,
>> >> hub->wakeup_bits)))
>> >> + || test_bit(i,
>> >> hub->wakeup_bits))) {
>> >
>> > Please add a comment here, explaining that this is to prevent any
>> > runtime suspends from powering-off the port while we're handling the
>> > events.
>> >
>>
>> Added:
>> /*
>> * The get_noresume and barrier ensures that
>> if
>
> s/ensures/ensure/
>
>> * the port was in the process of resuming we
>
> s/resuming/resuming,/
>
>> * flush that work and keep the port active
>> for
>> * the duration of the port_event().
>> However,
>> * if the port is runtime pm suspended
>> * (powered-off), we leave it in that state,
>> run
>> * an abbreviated port_event(), and move on.
>> */
>
> Otherwise fine.
>
Noted, thanks.
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