From: Mathias Nyman Date: Thu, 30 Apr 2015 14:16:02 +0000 (+0300) Subject: xhci: fix isoc endpoint dequeue from advancing too far on transaction error X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=8297f04683fa3a5f5b10ae0d948147d8715318b5;p=linux-edison.git xhci: fix isoc endpoint dequeue from advancing too far on transaction error commit d104d0152a97fade389f47635b73a9ccc7295d0b upstream. Isoc TDs usually consist of one TRB, sometimes two. When all goes well we receive only one success event for a TD, and move the dequeue pointer to the next TD. This fails if the TD consists of two TRBs and we get a transfer error on the first TRB, we will then see two events for that TD. Fix this by making sure the event we get is for the last TRB in that TD before moving the dequeue pointer to the next TD. This will resolve some of the uvc and dvb issues with the "ERROR Transfer event TRB DMA ptr not part of current TD" error message Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index bc7a886e3c3..4ff5158f5a8 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2144,8 +2144,13 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, break; case COMP_DEV_ERR: case COMP_STALL: + frame->status = -EPROTO; + skip_td = true; + break; case COMP_TX_ERR: frame->status = -EPROTO; + if (event_trb != td->last_trb) + return 0; skip_td = true; break; case COMP_STOP: