Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 76 insertions, 14 deletions

diff --git a/drivers/net/irda/irda-usb.c b/drivers/net/irda/irda-usb.c
index fa176ffb4ad5..8936058a3cce 100644
--- a/drivers/net/irda/irda-usb.c
+++ b/drivers/net/irda/irda-usb.c
@@ -108,6 +108,7 @@ static void irda_usb_close(struct irda_usb_cb *self);
 static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs);
 static void write_bulk_callback(struct urb *urb, struct pt_regs *regs);
 static void irda_usb_receive(struct urb *urb, struct pt_regs *regs);
+static void irda_usb_rx_defer_expired(unsigned long data);
 static int irda_usb_net_open(struct net_device *dev);
 static int irda_usb_net_close(struct net_device *dev);
 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
@@ -677,6 +678,12 @@ static void irda_usb_net_timeout(struct net_device *netdev)
  * on the interrupt pipe and hang the Rx URB only when an interrupt is
  * received.
  * Jean II
+ *
+ * Note : don't read the above as what we are currently doing, but as
+ * something we could do with KC dongle. Also don't forget that the
+ * interrupt pipe is not part of the original standard, so this would
+ * need to be optional...
+ * Jean II
  */
 
 /*------------------------------------------------------------------*/
@@ -704,10 +711,8 @@ static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struc
         /* Reinitialize URB */
         usb_fill_bulk_urb(urb, self->usbdev, 
                       usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep), 
-                      skb->data, skb->truesize,
+                      skb->data, IRDA_SKB_MAX_MTU,
                       irda_usb_receive, skb);
-        /* Note : unlink *must* be synchronous because of the code in 
-         * irda_usb_net_close() -> free the skb - Jean II */
         urb->status = 0;
 
         /* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
@@ -734,6 +739,7 @@ static void irda_usb_receive(struct urb *urb, struct pt_regs *regs)
         struct irda_skb_cb *cb;
         struct sk_buff *newskb;
         struct sk_buff *dataskb;
+        struct urb *next_urb;
         int             docopy;
 
         IRDA_DEBUG(2, "%s(), len=%d\n", __FUNCTION__, urb->actual_length);
@@ -755,20 +761,37 @@ static void irda_usb_receive(struct urb *urb, struct pt_regs *regs)
         if (urb->status != 0) {
                 switch (urb->status) {
                 case -EILSEQ:
-                        self->stats.rx_errors++;
                         self->stats.rx_crc_errors++;    
-                        break;
+                        /* Also precursor to a hot-unplug on UHCI. */
+                        /* Fallthrough... */
                 case -ECONNRESET:               /* -104 */
-                        IRDA_DEBUG(0, "%s(), Connection Reset (-104), transfer_flags 0x%04X \n", __FUNCTION__, urb->transfer_flags);
+                        /* Random error, if I remember correctly */
                         /* uhci_cleanup_unlink() is going to kill the Rx
                          * URB just after we return. No problem, at this
                          * point the URB will be idle ;-) - Jean II */
-                        break;
+                case -ESHUTDOWN:                /* -108 */
+                        /* That's usually a hot-unplug. Submit will fail... */
+                case -ETIMEDOUT:                /* -110 */
+                        /* Usually precursor to a hot-unplug on OHCI. */
                 default:
-                        IRDA_DEBUG(0, "%s(), RX status %d,transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags);
+                        self->stats.rx_errors++;
+                        IRDA_DEBUG(0, "%s(), RX status %d, transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags);
                         break;
                 }
-                goto done;
+                /* If we received an error, we don't want to resubmit the
+                 * Rx URB straight away but to give the USB layer a little
+                 * bit of breathing room.
+                 * We are in the USB thread context, therefore there is a
+                 * danger of recursion (new URB we submit fails, we come
+                 * back here).
+                 * With recent USB stack (2.6.15+), I'm seeing that on
+                 * hot unplug of the dongle...
+                 * Lowest effective timer is 10ms...
+                 * Jean II */
+                self->rx_defer_timer.function = &irda_usb_rx_defer_expired;
+                self->rx_defer_timer.data = (unsigned long) urb;
+                mod_timer(&self->rx_defer_timer, jiffies + (10 * HZ / 1000));
+                return;
         }
         
         /* Check for empty frames */
@@ -845,13 +868,45 @@ done:
          * idle slot....
          * Jean II */
         /* Note : with this scheme, we could submit the idle URB before
-         * processing the Rx URB. Another time... Jean II */
+         * processing the Rx URB. I don't think it would buy us anything as
+         * we are running in the USB thread context. Jean II */
+        next_urb = self->idle_rx_urb;
 
-        /* Submit the idle URB to replace the URB we've just received */
-        irda_usb_submit(self, skb, self->idle_rx_urb);
         /* Recycle Rx URB : Now, the idle URB is the present one */
         urb->context = NULL;
         self->idle_rx_urb = urb;
+
+        /* Submit the idle URB to replace the URB we've just received.
+         * Do it last to avoid race conditions... Jean II */
+        irda_usb_submit(self, skb, next_urb);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * In case of errors, we want the USB layer to have time to recover.
+ * Now, it is time to resubmit ouur Rx URB...
+ */
+static void irda_usb_rx_defer_expired(unsigned long data)
+{
+        struct urb *urb = (struct urb *) data;
+        struct sk_buff *skb = (struct sk_buff *) urb->context;
+        struct irda_usb_cb *self; 
+        struct irda_skb_cb *cb;
+        struct urb *next_urb;
+
+        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+        /* Find ourselves */
+        cb = (struct irda_skb_cb *) skb->cb;
+        IRDA_ASSERT(cb != NULL, return;);
+        self = (struct irda_usb_cb *) cb->context;
+        IRDA_ASSERT(self != NULL, return;);
+
+        /* Same stuff as when Rx is done, see above... */
+        next_urb = self->idle_rx_urb;
+        urb->context = NULL;
+        self->idle_rx_urb = urb;
+        irda_usb_submit(self, skb, next_urb);
 }
 
 /*------------------------------------------------------------------*/
@@ -990,6 +1045,9 @@ static int irda_usb_net_close(struct net_device *netdev)
         /* Stop network Tx queue */
         netif_stop_queue(netdev);
 
+        /* Kill defered Rx URB */
+        del_timer(&self->rx_defer_timer);
+
         /* Deallocate all the Rx path buffers (URBs and skb) */
         for (i = 0; i < IU_MAX_RX_URBS; i++) {
                 struct urb *urb = self->rx_urb[i];
@@ -1365,6 +1423,7 @@ static int irda_usb_probe(struct usb_interface *intf,
         self = net->priv;
         self->netdev = net;
         spin_lock_init(&self->lock);
+        init_timer(&self->rx_defer_timer);
 
         /* Create all of the needed urbs */
         for (i = 0; i < IU_MAX_RX_URBS; i++) {
@@ -1498,6 +1557,9 @@ static void irda_usb_disconnect(struct usb_interface *intf)
          * This will stop/desactivate the Tx path. - Jean II */
         self->present = 0;
 
+        /* Kill defered Rx URB */
+        del_timer(&self->rx_defer_timer);
+
         /* We need to have irq enabled to unlink the URBs. That's OK,
          * at this point the Tx path is gone - Jean II */
         spin_unlock_irqrestore(&self->lock, flags);
@@ -1507,11 +1569,11 @@ static void irda_usb_disconnect(struct usb_interface *intf)
                 /* Accept no more transmissions */
                 /*netif_device_detach(self->netdev);*/
                 netif_stop_queue(self->netdev);
-                /* Stop all the receive URBs */
+                /* Stop all the receive URBs. Must be synchronous. */
                 for (i = 0; i < IU_MAX_RX_URBS; i++)
                         usb_kill_urb(self->rx_urb[i]);
                 /* Cancel Tx and speed URB.
-                 * Toggle flags to make sure it's synchronous. */
+                 * Make sure it's synchronous to avoid races. */
                 usb_kill_urb(self->tx_urb);
                 usb_kill_urb(self->speed_urb);
         }