linux-kernel - Re: [PATCH v2] Re: WAN: new PPP code for generic HDLC

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Date:	Tue, 25 Mar 2008 16:50:27 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] Re: WAN: new PPP code for generic HDLC

Jeff Garzik <jeff@...zik.org> writes:

> 	I guess it should go into 2.6.25, not sure about "stable"
> 	series. I will appreciate any feedback, review and/or test
> 	results.

Right. Perhaps I should care a bit more about the stable series...

> At the time of the posting 2.6.25-rc6 had already been released, which
> seems like an inappropriate time for all that new code, which has been
> given so little exposure to real world testing.

Sure.

> Certainly your original message said PPP panics, but without even
> minimal testing how do we know that your new code doesn't have equally
> problematic issues?

Well, there was something like "minimal testing", and it doesn't panic
100% like the old code does. But the probability that it won't work
correctly is quite high.

IOW: the new version is certainly better than the old one, though it's
not the normal quality (in terms of testing) I'd like to see.

> So quite honestly a CONFIG_BROKEN patch might indeed be more
> appropriate since generic HDLC works with Frame Relay at least...

Actually Frame Relay and other protocols are not affected, the PPP
patch doesn't change them a bit, it's a different module. The new code
only affect PPP protocol.

I'm fine with the Kconfig patch, actually I'm not sure what is better
at this time - a known broken module marked as such or a new module
with some small chances that it will crash the machine and with much
bigger chances that it won't work with a certain PPP implementation on
the other end.

Something like that?
Untested :-)

Signed-off-by: Krzysztof Halasa <khc@...waw.pl>

--- a/drivers/net/wan/Kconfig
+++ b/drivers/net/wan/Kconfig
@@ -150,9 +150,13 @@ config HDLC_FR

 config HDLC_PPP
 	tristate "Synchronous Point-to-Point Protocol (PPP) support"
-	depends on HDLC
+	depends on HDLC && BROKEN
 	help
 	  Generic HDLC driver supporting PPP over WAN connections.
+	  This module is currently broken and will cause a kernel panic
+	  when a device configured in PPP mode is activated.
+
+	  It will be replaced by new PPP implementation in Linux 2.6.26.

 	  If unsure, say N.

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