Douglas Anderson <dianders@xxxxxxxxxxxx> > Sent: Friday, May 31, 2024 7:43 AM [...] > If we happened to get a USB transfer error during the transition to > suspend then the usb_queue_reset_device() that r8152_control_msg() > calls will get dropped on the floor. This is because > usb_lock_device_for_reset() (which usb_queue_reset_device() uses) > silently fails if it's called when a device is suspended or if too > much time passes. > > Let's resolve this by resetting the device ourselves in r8152's > resume() function. > > NOTE: due to timing, it's _possible_ that we could end up with two USB > resets: the one queued previously and the one called from the resume() > patch. This didn't happen in test cases I ran, though it's conceivably > possible. We can't easily know if this happened since > usb_queue_reset_device() can just silently drop the reset request. In > any case, it's not expected that this is a problem since the two > resets can't run at the same time (because of the device lock) and it > should be OK to reset the device twice. If somehow the double-reset > causes problems we could prevent resets from being queued up while > suspend is running. > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Acked-by: Hayes Wang <hayeswang@xxxxxxxxxxx> Best Regards, Hayes
