linux-kernel - [PATCH 4/6] dm: Make rt aware

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Message-Id: <20111121214757.011122160@goodmis.org>
Date:	Mon, 21 Nov 2011 16:44:24 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>, stable-rt@...r.kernel.org
Subject: [PATCH 4/6] dm: Make rt aware

From: Thomas Gleixner <tglx@...utronix.de>

Use the BUG_ON_NONRT variant for the irq_disabled() checks. RT has
interrupts legitimately enabled here as we cant deadlock against the
irq thread due to the "sleeping spinlocks" conversion.

Reported-by: Luis Claudio R. Goncalves <lclaudio@...g.org>
Cc: stable-rt@...r.kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 drivers/md/dm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 41abc6d..67207d6 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1644,14 +1644,14 @@ static void dm_request_fn(struct request_queue *q)
 		if (map_request(ti, clone, md))
 			goto requeued;
 
-		BUG_ON(!irqs_disabled());
+		BUG_ON_NONRT(!irqs_disabled());
 		spin_lock(q->queue_lock);
 	}
 
 	goto out;
 
 requeued:
-	BUG_ON(!irqs_disabled());
+	BUG_ON_NONRT(!irqs_disabled());
 	spin_lock(q->queue_lock);
 
 delay_and_out:
-- 
1.7.7.1



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