linux-kernel - [PATCH] parport: make lockdep happy with waitlist

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Message-Id: <824b6fef0971504d44a56b3b54ee0e21bf7f1519.1295883191.git.lasaine@lvk.cs.msu.su>
Date:	Mon, 24 Jan 2011 18:33:40 +0300
From:	Alexander Gordeev <lasaine@....cs.msu.su>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Gordeev <lasaine@....cs.msu.su>
Subject: [PATCH] parport: make lockdep happy with waitlist_lock

parport_unregister_device should never be used when interrupts are
enabled in hardware and irq handler is registered so there is no need
to disable interrupts when using waitlist_lock. But there is no way to
explain this subtle semantics to lockdep analyzer. So disable interrupts
here too to simplify things. The price is negligible.

Signed-off-by: Alexander Gordeev <lasaine@....cs.msu.su>
---
 drivers/parport/share.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/parport/share.c b/drivers/parport/share.c
index a2d9d1e..a848e02 100644
--- a/drivers/parport/share.c
+++ b/drivers/parport/share.c
@@ -678,7 +678,7 @@ void parport_unregister_device(struct pardevice *dev)
 
 	/* Make sure we haven't left any pointers around in the wait
 	 * list. */
-	spin_lock (&port->waitlist_lock);
+	spin_lock_irq(&port->waitlist_lock);
 	if (dev->waitprev || dev->waitnext || port->waithead == dev) {
 		if (dev->waitprev)
 			dev->waitprev->waitnext = dev->waitnext;
@@ -689,7 +689,7 @@ void parport_unregister_device(struct pardevice *dev)
 		else
 			port->waittail = dev->waitprev;
 	}
-	spin_unlock (&port->waitlist_lock);
+	spin_unlock_irq(&port->waitlist_lock);
 
 	kfree(dev->state);
 	kfree(dev);
-- 
1.7.2.3

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