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authorDavid S. Miller <davem@davemloft.net>2010-08-10 09:50:55 (GMT)
committerDavid S. Miller <davem@davemloft.net>2010-08-10 09:50:55 (GMT)
commitdacb397511289154a68dea1f4bd674c660161c23 (patch)
treead82840c1acd2f8e88d828cf8b8d819f1ca64f6f
parent68fd26b59856b466edd14d8a90d01255983cd3ee (diff)
downloadlinux-dacb397511289154a68dea1f4bd674c660161c23.tar.xz
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 <ellyjones@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/usb/usbnet.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 7f62e2d..ca7fc9d 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,