From: Christophe Leroy <christophe.leroy@c-s.fr>
Date: Fri, 10 Mar 2017 10:37:01 +0000 (+0100)
Subject: powerpc/8xx: fix mpc8xx_get_irq() return on no irq
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3c29b6038828c1f4c9ecbfec14d4fc5e25f1c947;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

powerpc/8xx: fix mpc8xx_get_irq() return on no irq

IRQ 0 is a valid HW interrupt. So get_irq() shall return 0 when
there is no irq, instead of returning irq_linear_revmap(... ,0)

Fixes: f2a0bd3753dad ("[POWERPC] 8xx: powerpc port of core CPM PIC")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/sysdev/mpc8xx_pic.c b/arch/powerpc/sysdev/mpc8xx_pic.c
index 3e828b20c21e..2842f9d63d21 100644
--- a/arch/powerpc/sysdev/mpc8xx_pic.c
+++ b/arch/powerpc/sysdev/mpc8xx_pic.c
@@ -79,7 +79,7 @@ unsigned int mpc8xx_get_irq(void)
 	irq = in_be32(&siu_reg->sc_sivec) >> 26;
 
 	if (irq == PIC_VEC_SPURRIOUS)
-		irq = 0;
+		return 0;
 
         return irq_linear_revmap(mpc8xx_pic_host, irq);