The following reply was made to PR usb/180726; it has been noted by GNATS.

From: dfil...@freebsd.org (dfilter service)
To: bug-follo...@freebsd.org
Cc:  
Subject: Re: usb/180726: commit references a PR
Date: Fri, 26 Jul 2013 06:28:49 +0000 (UTC)

 Author: hselasky
 Date: Fri Jul 26 06:28:41 2013
 New Revision: 253666
 URL: http://svnweb.freebsd.org/changeset/base/253666
 
 Log:
   MFC r253532:
   
   Fix an XHCI regression:
   
   The Block Event Interrupts, BEI, feature does not
   work like expected with the Renesas XHCI chipsets.
   Revert feature.
   
   While at it correct the TD SIZE computation in
   case of Zero Length Packet, ZLP, in the end of a
   multi frame USB transfer.
   
   PR:          usb/180726
 
 Modified:
   stable/8/sys/dev/usb/controller/xhci.c
 Directory Properties:
   stable/8/sys/   (props changed)
   stable/8/sys/dev/   (props changed)
   stable/8/sys/dev/usb/   (props changed)
 
 Modified: stable/8/sys/dev/usb/controller/xhci.c
 ==============================================================================
 --- stable/8/sys/dev/usb/controller/xhci.c     Fri Jul 26 06:24:33 2013        
(r253665)
 +++ stable/8/sys/dev/usb/controller/xhci.c     Fri Jul 26 06:28:41 2013        
(r253666)
 @@ -1654,7 +1654,6 @@ restart:
                        /* fill out buffer pointers */
  
                        if (average == 0) {
 -                              npkt = 0;
                                memset(&buf_res, 0, sizeof(buf_res));
                        } else {
                                usbd_get_page(temp->pc, temp->offset +
 @@ -1669,15 +1668,17 @@ restart:
                                        buf_res.length = XHCI_TD_PAGE_SIZE;
  
                                npkt_off += buf_res.length;
 -
 -                              /* setup npkt */
 -                              npkt = (len_old - npkt_off + 
temp->max_packet_size - 1) /
 -                                  temp->max_packet_size;
 -
 -                              if (npkt > 31)
 -                                      npkt = 31;
                        }
  
 +                      /* setup npkt */
 +                      npkt = (len_old - npkt_off + temp->max_packet_size - 1) 
/
 +                          temp->max_packet_size;
 +
 +                      if (npkt == 0)
 +                              npkt = 1;
 +                      else if (npkt > 31)
 +                              npkt = 31;
 +
                        /* fill out TRB's */
                        td->td_trb[x].qwTrb0 =
                            htole64((uint64_t)buf_res.physaddr);
 @@ -1691,9 +1692,7 @@ restart:
  
                        switch (temp->trb_type) {
                        case XHCI_TRB_TYPE_ISOCH:
 -                              /* BEI: Interrupts are inhibited until EOT */
                                dword = XHCI_TRB_3_CHAIN_BIT | 
XHCI_TRB_3_CYCLE_BIT |
 -                                  XHCI_TRB_3_BEI_BIT |
                                    XHCI_TRB_3_TBC_SET(temp->tbc) |
                                    XHCI_TRB_3_TLBPC_SET(temp->tlbpc);
                                if (td != td_first) {
 @@ -1728,10 +1727,8 @@ restart:
                                        dword |= XHCI_TRB_3_DIR_IN;
                                break;
                        default:        /* XHCI_TRB_TYPE_NORMAL */
 -                              /* BEI: Interrupts are inhibited until EOT */
                                dword = XHCI_TRB_3_CHAIN_BIT | 
XHCI_TRB_3_CYCLE_BIT |
                                    XHCI_TRB_3_TYPE_SET(XHCI_TRB_TYPE_NORMAL) |
 -                                  XHCI_TRB_3_BEI_BIT |
                                    XHCI_TRB_3_TBC_SET(temp->tbc) |
                                    XHCI_TRB_3_TLBPC_SET(temp->tlbpc);
                                if (temp->direction == UE_DIR_IN)
 @@ -1810,6 +1807,7 @@ restart:
                usb_pc_cpu_flush(td_first->page_cache);
        }
  
 +      /* clear TD SIZE to zero, hence this is the last TRB */
        /* remove chain bit because this is the last TRB in the chain */
        td->td_trb[td->ntrb - 1].dwTrb2 &= ~htole32(XHCI_TRB_2_TDSZ_SET(15));
        td->td_trb[td->ntrb - 1].dwTrb3 &= ~htole32(XHCI_TRB_3_CHAIN_BIT);
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