netdev - [PATCHv4] usbnet: Resubmit interrupt URB once if halted

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Date:	Tue, 19 Apr 2011 10:44:12 -0700
From:	Paul Stewart <pstew@...omium.org>
To:	netdev@...r.kernel.org
Cc:	linux-usb@...r.kernel.org, davem@...emloft.net,
	stern@...land.harvard.edu, greg@...ah.com
Subject: [PATCHv4] usbnet: Resubmit interrupt URB once if halted

Set a flag if the interrupt URB completes with ENOENT as this
occurs legitimately during system suspend.  When the
usbnet_resume is called, test this flag and try once to resubmit
the interrupt URB.

This version of the patch moves the urb submit directly into
usbnet_resume.  Is it okay to submit a GFP_KERNEL urb from
usbnet_resume()?

Signed-off-by: Paul Stewart <pstew@...omium.org>
---
 drivers/net/usb/usbnet.c   |   13 ++++++++++++-
 include/linux/usb/usbnet.h |    1 +
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 02d25c7..3651a48 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -482,6 +482,7 @@ static void intr_complete (struct urb *urb)
 	case -ESHUTDOWN:	/* hardware gone */
 		if (netif_msg_ifdown (dev))
 			devdbg (dev, "intr shutdown, code %d", status);
+		set_bit(EVENT_INTR_HALT, &dev->flags);
 		return;
 
 	/* NOTE:  not throttling like RX/TX, since this endpoint
@@ -1294,9 +1295,19 @@ int usbnet_resume (struct usb_interface *intf)
 {
 	struct usbnet		*dev = usb_get_intfdata(intf);
 
-	if (!--dev->suspend_count)
+	if (!--dev->suspend_count) {
 		tasklet_schedule (&dev->bh);
 
+		/* resubmit interrupt URB if it was halted by suspend */
+		if (dev->interrupt && netif_running(dev->net) &&
+		    netif_device_present(dev->net) &&
+		    test_bit(EVENT_INTR_HALT, &dev->flags)) {
+			clear_bit(EVENT_INTR_HALT, &dev->flags);
+			usb_submit_urb(dev->interrupt, GFP_KERNEL);
+		}
+	}
+}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(usbnet_resume);
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index ba09fe8..6c4b5f8 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -64,6 +64,7 @@ struct usbnet {
 #		define EVENT_RX_MEMORY	2
 #		define EVENT_STS_SPLIT	3
 #		define EVENT_LINK_RESET	4
+#		define EVENT_INTR_HALT	5
 };
 
 static inline struct usb_driver *driver_of(struct usb_interface *intf)
-- 
1.7.3.1

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