usbnet/cdc_ncm: add missing .reset_resume hook
 

BugLink: http://bugs.launchpad.net/bugs/793892

This avoids messages like this after suspend:

cdc_ncm 2-1.4:1.6: no reset_resume for driver cdc_ncm?
cdc_ncm 2-1.4:1.7: no reset_resume for driver cdc_ncm?
cdc_ncm 2-1.4:1.6: usb0: unregister 'cdc_ncm' usb-0000:00:1d.0-1.4, CDC NCM

This is important for the Ericsson F5521gw GSM/UMTS modem.
Otherwise modemmanager looses the fact that the cdc_ncm and cdc_acm devices
belong together.

The cdc_ether module does the same.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

(backport from commit 85e3c65fa3a1d0542c18151 upstream)
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
---
drivers/net/usb/cdc_ncm.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 7113168..9d78fe6 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -54,7 +54,7 @@
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc.h>

-#define DRIVER_VERSION "7-Feb-2011"
+#define DRIVER_VERSION "01-June-2011"

/* CDC NCM subclass 3.2.1 */
#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
@@ -1254,6 +1254,7 @@ static struct usb_driver cdc_ncm_driver = {
.disconnect = cdc_ncm_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
+ .reset_resume = usbnet_resume,
.supports_autosuspend = 1,
};

--
1.7.0.4




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usbnet/cdc_ncm: add missing .reset_resume hook
 

BugLink: http://bugs.launchpad.net/bugs/793892

SRU Justification:

Impact: The cdc_ncm module, which provides support for the Ericsson
F5521gw Mobile Broadband Modem, unregisters the device after suspend
because the .reset_resume hook in the driver is not assigned.

Fix: Upstream commit 85e3c65fa3a1d0542c18151

Test Case: Without the fix, after resume from suspend you'll notice
messages similar to the following in dmesg output:

cdc_ncm 2-1.4:1.6: no reset_resume for driver cdc_ncm?
cdc_ncm 2-1.4:1.7: no reset_resume for driver cdc_ncm?
cdc_ncm 2-1.4:1.6: usb0: unregister 'cdc_ncm' usb-0000:00:1d.0-1.4, CDC NCM

The patch author, who is also the LP bug reporter, submitted this to
upstream 2.6.38.y but was unfortunately told there will be no further
2.6.38.y releases:

http://marc.info/?l=linux-usb&m=130737305305181&w=2

I've built a test kernel with the patch applied and have confirmation it
resolves the issue. Please consider for Natty SRU. Note the only
reason it is not a clean cherry-pick is due to the DRIVER_VERSION
string.

Thanks,
Leann

The following changes since commit f3fd91d6053b0fc7d37815d2830495ffe5c6b06e:
Tim Gardner (1):
UBUNTU: Start new release

are available in the git repository at:

git://kernel.ubuntu.com/ogasawara/ubuntu-natty.git lp793892

Stefan Metzmacher (1):
usbnet/cdc_ncm: add missing .reset_resume hook

drivers/net/usb/cdc_ncm.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)