Message-ID: <48FE1D52.6080903@ceibo.fiec.espol.edu.ec>
Date:	Tue, 21 Oct 2008 13:20:02 -0500
From:	Alex Villací­s Lasso 
	<avillaci@...bo.fiec.espol.edu.ec>
To:	netdev@...r.kernel.org
Subject: Regression: Recent networking (qdisc?) patches break irda_get_next_speed()

A regression has been introduced in 2.6.27 in the networking code, which 
breaks the irda_get_next_speed() function used by some IrDA drivers, 
including ks959-sir, written by me. I have filed a bug at:

http://bugzilla.kernel.org/show_bug.cgi?id=11795

to keep track of this. I am still performing bisection to locate the 
exact commit that broke the code, but the bug involves an overwriting of 
the beginning of a structure with extraneous data that makes the 
LAP_MAGIC check fail. I have tried searching the netdev archives, but 
there is no mention at all of regressions caused by this code. Milan 
Plzik at irda-users mentions the same problem affecting pxaficp_ir, and 
mentions recent qdisc patches as possible culprits.  Vasily Khoruzhick 
reported this bug at irda-users, and a quick hack (not a proper fix) 
proposed by him involves padding "struct irda_skb_cb" with 4 bytes at 
the beginning of the structure to move everything else past the buggy 
scribbling.


This URL contains an early reference to what is possibly this same bug
http://sourceforge.net/mailarchive/forum.php?thread_name=1223138254.21553.7.camel%40localhost&forum_name=irda-users

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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