linux-kernel - Re: [Bug #15127] Bluetooth: sleeping function called from invalid context

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Message-ID: <1264986406.31341.5.camel@localhost.localdomain>
Date:	Sun, 31 Jan 2010 17:06:46 -0800
From:	Marcel Holtmann <marcel@...tmann.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	David John <davidjon@...ontk.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>
Subject: Re: [Bug #15127] Bluetooth: sleeping function called from invalid
 context

Hi Rafael,

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.31 and 2.6.32.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.31 and 2.6.32.  Please verify if it still should
> be listed and let me know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=15127
> Subject		: Bluetooth: sleeping function called from invalid context
> Submitter	: David John <davidjon@...ontk.org>
> Date		: 2010-01-12 9:19 (20 days old)
> First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9e726b17422bade75fba94e625cd35fd1353e682
> References	: http://marc.info/?l=linux-kernel&m=126328727021949&w=4

you have an outdated email from Luiz and I change it to the right one
now.

I looked with him at the patch and I think this will fix it:

diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index fc5ee32..2b50637 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -252,7 +252,6 @@ static void rfcomm_session_timeout(unsigned long
arg)
 	BT_DBG("session %p state %ld", s, s->state);
 
 	set_bit(RFCOMM_TIMED_OUT, &s->flags);
-	rfcomm_session_put(s);
 	rfcomm_schedule(RFCOMM_SCHED_TIMEO);
 }
 
@@ -1920,6 +1919,7 @@ static inline void rfcomm_process_sessions(void)
 		if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
 			s->state = BT_DISCONN;
 			rfcomm_send_disc(s, 0);
+			rfcomm_session_put(s);
 			continue;
 		}
 
We need some extra testing on this with the actual hardware we did the
patch for. So this will take at least a few days before we get our hands
on it.

Regards

Marcel


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