On Thu, Feb 20, 2020 at 07:52:09AM -0300, Fabio Estevam wrote: > From: Peter Chen <peter.chen@xxxxxxx> > > [ Upstream commit dc0ffbea5729a3abafa577ebfce87f18b79e294b ] > > On some situations, the software handles TRB events slower > than adding TRBs, then xhci_handle_event can't return zero > long time, the xHC will consider the event ring is full, > and trigger "Event Ring Full" error, but in fact, the software > has already finished lots of events, just no chance to > update ERDP (event ring dequeue pointer). > > In this commit, we force update ERDP if half of TRBS_PER_SEGMENT > events have handled to avoid "Event Ring Full" error. > > Signed-off-by: Peter Chen <peter.chen@xxxxxxx> > Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> > Link: https://lore.kernel.org/r/1573836603-10871-2-git-send-email-mathias.nyman@xxxxxxxxxxxxxxx > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Fabio Estevam <festevam@xxxxxxxxx> > --- > Hi, > > One of our customer running 4.14 reported that this upstream patch > fixes USB issues, so I am sending it to the stable trees. It also needs to go to 4.19.y and 5.4.y, so I have added it there too. thanks, greg k-h
