linux-kernel - Re: cdc-acm driver hangs on poll() call

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Date:	Wed, 22 Apr 2009 15:25:00 +0200
From:	Maróy Ákos <akos@...oy.hu>
To:	Oliver Neukum <oliver@...kum.org>
CC:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: cdc-acm driver hangs on poll() call - 2.6.27, works on 2.6.24

Oliver,

> That's odd. I can't tell from the log. Can you make a usbmon trace?

sure:

cat /sys/kernel/debug/usbmon/1u

ffff880088545300 2462700154 S Ii:1:006:1 -115:8 8 <
ffff8800884b2600 2462700171 S Co:1:006:0 s 21 22 0003 0000 0000 0
ffff8800884b2600 2462701898 C Co:1:006:0 0 0
ffff880088545240 2462702064 S Bo:1:006:7 -115 6 = 060a0000 0000
ffff880088545900 2462702133 S Bi:1:006:2 -115 128 <
ffff880088545cc0 2462702142 S Bi:1:006:2 -115 128 <
ffff880088545600 2462702146 S Bi:1:006:2 -115 128 <
ffff8800885450c0 2462702150 S Bi:1:006:2 -115 128 <
ffff8800885453c0 2462702154 S Bi:1:006:2 -115 128 <
ffff880088545480 2462702158 S Bi:1:006:2 -115 128 <
ffff880088545180 2462702162 S Bi:1:006:2 -115 128 <
ffff8800885456c0 2462702166 S Bi:1:006:2 -115 128 <
ffff880088545540 2462702170 S Bi:1:006:2 -115 128 <
ffff880088545000 2462702174 S Bi:1:006:2 -115 128 <
ffff8800885459c0 2462702179 S Bi:1:006:2 -115 128 <
ffff880088545840 2462702183 S Bi:1:006:2 -115 128 <
ffff880088545f00 2462702187 S Bi:1:006:2 -115 128 <
ffff880088545c00 2462702191 S Bi:1:006:2 -115 128 <
ffff880088545b40 2462702199 S Bi:1:006:2 -115 128 <
ffff880088545a80 2462702202 S Bi:1:006:2 -115 128 <


this is where it hangs on poll(). then I press CTRL-C for the
application, then I get:

ffff88007c8e2b40 2502550672 S Co:1:006:0 s 21 22 0000 0000 0000 0
ffff88007c8e2b40 2502552140 C Co:1:006:0 0 0
ffff880088545300 2502553133 C Ii:1:006:1 -2:8 0
ffff880088545240 2502554132 C Bo:1:006:7 -2 0
ffff880088545a80 2502555132 C Bi:1:006:2 -2 0
ffff880088545b40 2502556132 C Bi:1:006:2 -2 0
ffff880088545c00 2502557132 C Bi:1:006:2 -2 0
ffff880088545f00 2502558132 C Bi:1:006:2 -2 0
ffff880088545840 2502559132 C Bi:1:006:2 -2 0
ffff8800885459c0 2502560131 C Bi:1:006:2 -2 0
ffff880088545000 2502561130 C Bi:1:006:2 -2 0
ffff880088545540 2502562126 C Bi:1:006:2 -2 0
ffff8800885456c0 2502563132 C Bi:1:006:2 -2 0
ffff880088545180 2502564131 C Bi:1:006:2 -2 0
ffff880088545480 2502565130 C Bi:1:006:2 -2 0
ffff8800885453c0 2502566125 C Bi:1:006:2 -2 0
ffff8800885450c0 2502567134 C Bi:1:006:2 -2 0
ffff880088545600 2502568134 C Bi:1:006:2 -2 0
ffff880088545cc0 2502569134 C Bi:1:006:2 -2 0
ffff880088545900 2502570134 C Bi:1:006:2 -2 0




Akos
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