linux-kernel - [PATCH 0/3] Synaptics

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Date:	Thu, 14 Sep 2006 02:44:01 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Andrew Morton <akpm@...l.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:	lkml <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: [PATCH 0/3] Synaptics - fix lockdep warnings 

Hi,

the following three patches fix two lockdep warnings I am receiving with 
2.6.18-rc6-mm2 (but at least the first one has been already discussed in 
the times of 2.6.17, reported by Dave Jones) and I can see the problem in 
current mainline source too).

* [1/3] fixes this:
 =============================================
 [ INFO: possible recursive locking detected ]
 2.6.18-rc6-mm2-dirty #4
 ---------------------------------------------
 kseriod/140 is trying to acquire lock:
  (&ps2dev->cmd_mutex/1){--..}, at: [<c02b973b>] ps2_command+0x5b/0x3a0

 but task is already holding lock:
  (&ps2dev->cmd_mutex/1){--..}, at: [<c02b973b>] ps2_command+0x5b/0x3a0


* [2/3] adds support for spin_lock_irqsave_nested(), which is needed by 
[3/3]

* [3/3] fixes this:
 =============================================
 [ INFO: possible recursive locking detected ]
 2.6.18-rc6-mm2-dirty #7
 ---------------------------------------------
 swapper/0 is trying to acquire lock:
  (&serio->lock){++..}, at: [<c02b7a20>] serio_interrupt+0x20/0x60

 but task is already holding lock:
  (&serio->lock){++..}, at: [<c02b7a20>] serio_interrupt+0x20/0x60

All three patches are based against 2.6.18-rc6-mm2, I can rebase them 
against mainline, if needed.

Both warnings have been solved by splitting the respective functions to 
nested and non-nested variants, and calling them from synpatics driver as 
appropriate.
 
-- 
JiKos.
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