linux-kernel - [PATCH 9/9] omap mmc host: Use disable_irq

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Message-Id: <1239861321.29831.130.camel@linux-51e8.site>
Date:	Thu, 16 Apr 2009 15:55:21 +1000
From:	Ben Nizette <bn@...sdigital.com>
To:	linux-omap@...r.kernel.org
Cc:	pierre@...man.eu, linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 9/9] omap mmc host: Use disable_irq_nosync() from within
	irq handlers.


disable_irq() should wait for all running handlers to complete
before returning.  As such, if it's used to disable an interrupt
from that interrupt's handler it will deadlock.  This replaces
the dangerous instances with the _nosync() variant which doesn't
have this problem.

Signed-off-by: Ben Nizette <bn@...sdigital.com>
---
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 5570849..d5ea652 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -824,7 +824,7 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
 		del_timer(&host->cmd_abort_timer);
 		host->abort = 1;
 		OMAP_MMC_WRITE(host, IE, 0);
-		disable_irq(host->irq);
+		disable_irq_nosync(host->irq);
 		schedule_work(&host->cmd_abort_work);
 		return IRQ_HANDLED;
 	}
-- 
1.6.0.2



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