linux-kernel - [PATCH 3.18 170/183] bus: omap_l3_noc: Correct returning IRQ_HANDLED unconditionally in the irq handler

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Message-Id: <20150125180817.557633457@linuxfoundation.org>
Date:	Sun, 25 Jan 2015 10:08:12 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Nishanth Menon <nm@...com>,
	Keerthy <j-keerthy@...com>, Tony Lindgren <tony@...mide.com>
Subject: [PATCH 3.18 170/183] bus: omap_l3_noc: Correct returning IRQ_HANDLED unconditionally in the irq handler

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Keerthy <j-keerthy@...com>

commit c4cf0935a2d8fe6d186bf4253ea3c4b4a8a8a710 upstream.

Correct returning IRQ_HANDLED unconditionally in the irq handler.
Return IRQ_NONE for some interrupt which we do not expect to be
handled in this handler. This prevents kernel stalling with back
to back spurious interrupts.

Fixes: 2722e56de6 ("OMAP4: l3: Introduce l3-interconnect error handling driver")
Acked-by: Nishanth Menon <nm@...com>
Signed-off-by: Keerthy <j-keerthy@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/bus/omap_l3_noc.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/bus/omap_l3_noc.c
+++ b/drivers/bus/omap_l3_noc.c
@@ -222,10 +222,14 @@ static irqreturn_t l3_interrupt_handler(
 			}
 
 			/* Error found so break the for loop */
-			break;
+			return IRQ_HANDLED;
 		}
 	}
-	return IRQ_HANDLED;
+
+	dev_err(l3->dev, "L3 %s IRQ not handled!!\n",
+		inttype ? "debug" : "application");
+
+	return IRQ_NONE;
 }
 
 static const struct of_device_id l3_noc_match[] = {


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