linux-kernel - [PATCH] powerpc/8xx: fix cpm_cascade() dual end of interrupt

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Date:   Tue, 27 Feb 2018 12:25:55 +0100 (CET)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Scott Wood <oss@...error.net>,
        Vitaly Bordug <vitb@...nel.crashing.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/8xx: fix cpm_cascade() dual end of interrupt

cpm_cascade() doesn't have to call eoi() as it is already called
by handle_fasteoi_irq()

And cpm_get_irq() will always return an unsigned int so the test
is useless

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/platforms/8xx/m8xx_setup.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index e1274db53d48..2188d691a40f 100644
--- a/arch/powerpc/platforms/8xx/m8xx_setup.c
+++ b/arch/powerpc/platforms/8xx/m8xx_setup.c
@@ -217,13 +217,7 @@ void __noreturn mpc8xx_restart(char *cmd)
 
 static void cpm_cascade(struct irq_desc *desc)
 {
-	struct irq_chip *chip = irq_desc_get_chip(desc);
-	int cascade_irq = cpm_get_irq();
-
-	if (cascade_irq >= 0)
-		generic_handle_irq(cascade_irq);
-
-	chip->irq_eoi(&desc->irq_data);
+	generic_handle_irq(cpm_get_irq());
 }
 
 /* Initialize the internal interrupt controllers.  The number of
-- 
2.13.3