target/linux/brcm2708/patches-3.10/0088-dwc_otg-prevent-crashes-on-host-port-disconnects.patch

   1 From afde583fbb644cff07984f2b47f75c0410d72205 Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Mon, 5 Aug 2013 11:47:12 +0100
   4 Subject: [PATCH 088/174] dwc_otg: prevent crashes on host port disconnects
   5
   6 Fix several issues resulting in crashes or inconsistent state
   7 if a Model A root port was disconnected.
   8
   9 - Clean up queue heads properly in kill_urbs_in_qh_list by
  10   removing the empty QHs from the schedule lists
  11 - Set the halt status properly to prevent IRQ handlers from
  12   using freed memory
  13 - Add fiq_split related cleanup for saved registers
  14 - Make microframe scheduling reclaim host channels if
  15   active during a disconnect
  16 - Abort URBs with -ESHUTDOWN status response, informing
  17   device drivers so they respond in a more correct fashion
  18   and don't try to resubmit URBs
  19 - Prevent IRQ handlers from attempting to handle channel
  20   interrupts if the associated URB was dequeued (and the
  21   driver state was cleared)
  22 ---
  23  drivers/usb/host/dwc_otg/dwc_otg_hcd.c       | 44 ++++++++++++++++++++++++----
  24  drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c  |  7 +++++
  25  drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c |  3 ++
  26  3 files changed, 48 insertions(+), 6 deletions(-)
  27
  28 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
  29 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
  30 @@ -59,6 +59,11 @@ static int last_sel_trans_num_avail_hc_a
  31
  32  extern int g_next_sched_frame, g_np_count, g_np_sent;
  33
  34 +extern haint_data_t haint_saved;
  35 +extern hcintmsk_data_t hcintmsk_saved[MAX_EPS_CHANNELS];
  36 +extern hcint_data_t hcint_saved[MAX_EPS_CHANNELS];
  37 +extern gintsts_data_t ginsts_saved;
  38 +
  39  dwc_otg_hcd_t *dwc_otg_hcd_alloc_hcd(void)
  40  {
  41         return DWC_ALLOC(sizeof(dwc_otg_hcd_t));
  42 @@ -168,31 +173,43 @@ static void del_timers(dwc_otg_hcd_t * h
  43
  44  /**
  45   * Processes all the URBs in a single list of QHs. Completes them with
  46 - * -ETIMEDOUT and frees the QTD.
  47 + * -ESHUTDOWN and frees the QTD.
  48   */
  49  static void kill_urbs_in_qh_list(dwc_otg_hcd_t * hcd, dwc_list_link_t * qh_list)
  50  {
  51 -       dwc_list_link_t *qh_item;
  52 +       dwc_list_link_t *qh_item, *qh_tmp;
  53         dwc_otg_qh_t *qh;
  54         dwc_otg_qtd_t *qtd, *qtd_tmp;
  55
  56 -       DWC_LIST_FOREACH(qh_item, qh_list) {
  57 +       DWC_LIST_FOREACH_SAFE(qh_item, qh_tmp, qh_list) {
  58                 qh = DWC_LIST_ENTRY(qh_item, dwc_otg_qh_t, qh_list_entry);
  59                 DWC_CIRCLEQ_FOREACH_SAFE(qtd, qtd_tmp,
  60                                          &qh->qtd_list, qtd_list_entry) {
  61                         qtd = DWC_CIRCLEQ_FIRST(&qh->qtd_list);
  62                         if (qtd->urb != NULL) {
  63                                 hcd->fops->complete(hcd, qtd->urb->priv,
  64 -                                                   qtd->urb, -DWC_E_TIMEOUT);
  65 +                                                   qtd->urb, -DWC_E_SHUTDOWN);
  66                                 dwc_otg_hcd_qtd_remove_and_free(hcd, qtd, qh);
  67                         }
  68
  69                 }
  70 +               if(qh->channel) {
  71 +                       /* Using hcchar.chen == 1 is not a reliable test.
  72 +                        * It is possible that the channel has already halted
  73 +                        * but not yet been through the IRQ handler.
  74 +                        */
  75 +                       dwc_otg_hc_halt(hcd->core_if, qh->channel,
  76 +                               DWC_OTG_HC_XFER_URB_DEQUEUE);
  77 +                       if(microframe_schedule)
  78 +                               hcd->available_host_channels++;
  79 +                       qh->channel = NULL;
  80 +               }
  81 +               dwc_otg_hcd_qh_remove(hcd, qh);
  82         }
  83  }
  84
  85  /**
  86 - * Responds with an error status of ETIMEDOUT to all URBs in the non-periodic
  87 + * Responds with an error status of ESHUTDOWN to all URBs in the non-periodic
  88   * and periodic schedules. The QTD associated with each URB is removed from
  89   * the schedule and freed. This function may be called when a disconnect is
  90   * detected or when the HCD is being stopped.
  91 @@ -278,7 +295,8 @@ static int32_t dwc_otg_hcd_disconnect_cb
  92          */
  93         dwc_otg_hcd->flags.b.port_connect_status_change = 1;
  94         dwc_otg_hcd->flags.b.port_connect_status = 0;
  95 -
  96 +       if(fiq_fix_enable)
  97 +               local_fiq_disable();
  98         /*
  99          * Shutdown any transfers in process by clearing the Tx FIFO Empty
 100          * interrupt mask and status bits and disabling subsequent host
 101 @@ -374,8 +392,22 @@ static int32_t dwc_otg_hcd_disconnect_cb
 102                                 channel->qh = NULL;
 103                         }
 104                 }
 105 +               if(fiq_split_enable) {
 106 +                       for(i=0; i < 128; i++) {
 107 +                               dwc_otg_hcd->hub_port[i] = 0;
 108 +                       }
 109 +                       haint_saved.d32 = 0;
 110 +                       for(i=0; i < MAX_EPS_CHANNELS; i++) {
 111 +                               hcint_saved[i].d32 = 0;
 112 +                               hcintmsk_saved[i].d32 = 0;
 113 +                       }
 114 +               }
 115 +
 116         }
 117
 118 +       if(fiq_fix_enable)
 119 +               local_fiq_enable();
 120 +
 121         if (dwc_otg_hcd->fops->disconnect) {
 122                 dwc_otg_hcd->fops->disconnect(dwc_otg_hcd);
 123         }
 124 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
 125 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
 126 @@ -2660,6 +2660,13 @@ int32_t dwc_otg_hcd_handle_hc_n_intr(dwc
 127
 128         hc = dwc_otg_hcd->hc_ptr_array[num];
 129         hc_regs = dwc_otg_hcd->core_if->host_if->hc_regs[num];
 130 +       if(hc->halt_status == DWC_OTG_HC_XFER_URB_DEQUEUE) {
 131 +               /* We are responding to a channel disable. Driver
 132 +                * state is cleared - our qtd has gone away.
 133 +                */
 134 +               release_channel(dwc_otg_hcd, hc, NULL, hc->halt_status);
 135 +               return 1;
 136 +       }
 137         qtd = DWC_CIRCLEQ_FIRST(&hc->qh->qtd_list);
 138
 139         hcint.d32 = DWC_READ_REG32(&hc_regs->hcint);
 140 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
 141 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
 142 @@ -309,6 +309,9 @@ static int _complete(dwc_otg_hcd_t * hcd
 143         case -DWC_E_OVERFLOW:
 144                 status = -EOVERFLOW;
 145                 break;
 146 +       case -DWC_E_SHUTDOWN:
 147 +               status = -ESHUTDOWN;
 148 +               break;
 149         default:
 150                 if (status) {
 151                         DWC_PRINTF("Uknown urb status %d\n", status);