From dacb397511289154a68dea1f4bd674c660161c23 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 10 Aug 2010 02:50:55 -0700 Subject: [PATCH] usbnet: rx_submit() should return an error code. This patch makes rx_submit() return an error code, and makes some call sites that care check the return value. This is important because it lets us properly handle cases where the device isn't ready to handle URB submissions (e.g., when it is autosuspended under some drivers); previously, we would attempt and fail to submit URBs and reschedule ourselves to try and fail again. This patch is against Linus's 2.6 repo commit 45d7f32c7a43cbb9592886d38190e379e2eb2226. Signed-Off-By: Elizabeth Jones Signed-off-by: David S. Miller --- drivers/net/usb/usbnet.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 7f62e2dea28..ca7fc9df1cc 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -315,7 +315,7 @@ EXPORT_SYMBOL_GPL(usbnet_defer_kevent); static void rx_complete (struct urb *urb); -static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) +static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) { struct sk_buff *skb; struct skb_data *entry; @@ -327,7 +327,7 @@ static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); usbnet_defer_kevent (dev, EVENT_RX_MEMORY); usb_free_urb (urb); - return; + return -ENOMEM; } skb_reserve (skb, NET_IP_ALIGN); @@ -357,6 +357,9 @@ static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) netif_dbg(dev, ifdown, dev->net, "device gone\n"); netif_device_detach (dev->net); break; + case -EHOSTUNREACH: + retval = -ENOLINK; + break; default: netif_dbg(dev, rx_err, dev->net, "rx submit, %d\n", retval); @@ -374,6 +377,7 @@ static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) dev_kfree_skb_any (skb); usb_free_urb (urb); } + return retval; } @@ -912,6 +916,7 @@ fail_halt: /* tasklet could resubmit itself forever if memory is tight */ if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { struct urb *urb = NULL; + int resched = 1; if (netif_running (dev->net)) urb = usb_alloc_urb (0, GFP_KERNEL); @@ -922,10 +927,12 @@ fail_halt: status = usb_autopm_get_interface(dev->intf); if (status < 0) goto fail_lowmem; - rx_submit (dev, urb, GFP_KERNEL); + if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) + resched = 0; usb_autopm_put_interface(dev->intf); fail_lowmem: - tasklet_schedule (&dev->bh); + if (resched) + tasklet_schedule (&dev->bh); } } @@ -1175,8 +1182,11 @@ static void usbnet_bh (unsigned long param) // don't refill the queue all at once for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { urb = usb_alloc_urb (0, GFP_ATOMIC); - if (urb != NULL) - rx_submit (dev, urb, GFP_ATOMIC); + if (urb != NULL) { + if (rx_submit (dev, urb, GFP_ATOMIC) == + -ENOLINK) + return; + } } if (temp != dev->rxq.qlen) netif_dbg(dev, link, dev->net, -- 2.20.1