linux-kernel - [PATCH] Erroneous double irq

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Message-Id: <201304172204.r3HM4BmU024718@localhost.localdomain>
Date:	Thu, 18 Apr 2013 00:04:11 +0200
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] Erroneous double irq_eoi() on CPM IRQ in MPC8xx

irq_eoi() is already called by generic_handle_irq() so 
it shall not be called a again

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Index: linux/arch/powerpc/platforms/8xx/m8xx_setup.c
===================================================================
--- linux/arch/powerpc/platforms/8xx/m8xx_setup.c	(revision 4802)
+++ linux/arch/powerpc/platforms/8xx/m8xx_setup.c	(working copy)
@@ -218,19 +218,12 @@
 
 static void cpm_cascade(unsigned int irq, struct irq_desc *desc)
 {
-	struct irq_chip *chip;
-	int cascade_irq;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int cascade_irq = cpm_get_irq());
 
-	if ((cascade_irq = cpm_get_irq()) >= 0) {
-		struct irq_desc *cdesc = irq_to_desc(cascade_irq);
-
+	if (cascade_irq >= 0)
 		generic_handle_irq(cascade_irq);
 
-		chip = irq_desc_get_chip(cdesc);
-		chip->irq_eoi(&cdesc->irq_data);
-	}
-
-	chip = irq_desc_get_chip(desc);
 	chip->irq_eoi(&desc->irq_data);
 }
 
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