netdev - Re: What was the reason for 2.6.22 SMP kernels to change how sendmsg is called?

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Message-ID: <20071214063324.GC26171@2ka.mipt.ru>
Date:	Fri, 14 Dec 2007 09:33:24 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Kevin Wilson <Kevin.Wilson@...trol.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: What was the reason for 2.6.22 SMP kernels to change how sendmsg is called?

Hi Kevin.

On Thu, Dec 13, 2007 at 04:00:02PM -0600, Kevin Wilson (Kevin.Wilson@...trol.com) wrote:
> I see your point but it just so happens it is a GPL'd driver, as is all of our Linux code we produce for our hardware. Granted it is out of tree, and after you saw it you would want it to stay that way. However, I would have sent you the whole thing if that is a pre-req to cordial exchanges on this list.
> 
> Nonetheless, a somewhat recent change in your tree, that I could not pinpoint on my own, caused the driver to stop functioning properly. So after much searching in git/google/sources with no luck, I decided to ask for a little assistance, maybe just a hint as to where the culprit may be in the tree so I could investigate for myself. For SNGs I tried the method that now works but I am still at a loss as to (can't find) what changes in the tree caused it to fail.

Without having your code it is virtually impossible to say, why you have
a bug. And do not express your frustration telling 'zero people
responded to my bug report'. This was not a bug report at all, but empty
message about 'my code stopped working after some network changes, which
broke the stuff.

>Now in 2.6.22 and later kernels you must use the higher level SOCKET to
>make a call to PROTO_OPS then to sendmsg(). e.g., socket->ops->sendmsg().

It was done because of bug found in inet_sendmsg(), which tried to
autobind socket it should not try.

-- 
	Evgeniy Polyakov
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