* Re: [Bugme-new] [Bug 28552] New: ipheth stopped working between 2.6.35.9 and 2.6.36.2
[not found] <bug-28552-10286@https.bugzilla.kernel.org/>
@ 2011-02-07 23:07 ` Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2011-02-07 23:07 UTC (permalink / raw)
To: linux-usb, netdev; +Cc: bugzilla-daemon, bugme-daemon, linux-kernel
(switched to email. Please respond via emailed reply-to-all, not via the
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On Mon, 7 Feb 2011 19:24:29 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=28552
>
> Summary: ipheth stopped working between 2.6.35.9 and 2.6.36.2
> Product: Drivers
> Version: 2.5
> Kernel Version: 2.6.36.2
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: Network
> AssignedTo: drivers_network@kernel-bugs.osdl.org
> ReportedBy: linux-kernel@jmbreuer.net
> Regression: Yes
>
>
> Created an attachment (id=46762)
> --> (https://bugzilla.kernel.org/attachment.cgi?id=46762)
> tcpdump of iPhone tethering attempt in 2.6.36.2
>
> Overview:
>
> Internet connection via iPhone 3G ("USB tethering") no longer works in
> 2.6.36.2; it appears that the packets coming from the iPhone are
> misinterpreted.
>
> Steps to Reproduce:
>
> 1) Connect iPhone to computer via USB cable
>
> 2) Put iPhone in "tethering" mode
>
> Actual Results:
>
> The DHCP client times out trying to obtain a lease.
>
> Expected Results:
>
> The computer gets IP information via DHCP, and is able to share the
> iPhone's internet connection.
>
> Build Date & Platform:
>
> 2.6.36.2 on x86_64
> iPhone 3G Firmware 3.1.3
>
> Additional Builds and Platforms:
>
> 2.6.35.9 on x86_64 (same hardware) works as expected.
>
> Additional Information:
>
> Attached are 2 tcpdump logs:
> 2.6.36.2-tcpdump.txt in the failure case
> 2.6.35.9-tcpdump.txt, working connection setup
>
> Comparing the DHCP reply at 19:53:36.581403 (works) to 19:05:05.744666 (fails)
> it appears that 2.6.36.2 misinterprets the data coming from the iPhone, so that
> the failing packet is not recognized as an IP packet / valid DHCP reply.
>
> The change to ipheth.c itself between 2.6.36 and 2.6.35 seems trivial:
> http://lxr.free-electrons.com/diff/drivers/net/usb/ipheth.c?v=2.6.35;diffval=2.6.36;diffvar=v
>
> Therefore I'd at first tried copying 2.6.35's ipheth.c into my 2.6.36 tree and
> rebuilding this driver; it appears to fail the same as vanilla 2.6.36 does
> [sorry, no logs - I can repeat this if required].
>
> This suggests that the failure happens somewhere in either the networking or
> USB layer, not the ipheth.c driver itself.
>
> I'm happy to perform any additional testing required.
>
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