Patch "powerpc/8xx: fix mpc8xx_get_irq() return on no irq" has been added to the 4.9-stable tree

Patch "powerpc/8xx: fix mpc8xx_get_irq() return on no irq" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-8xx-fix-mpc8xx_get_irq-return-on-no-irq.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Christophe Leroy <christophe.leroy@c-s.fr>
Date: Fri, 10 Mar 2017 11:37:01 +0100
Subject: powerpc/8xx: fix mpc8xx_get_irq() return on no irq

From: Christophe Leroy <christophe.leroy@c-s.fr>


[ Upstream commit 3c29b6038828c1f4c9ecbfec14d4fc5e25f1c947 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/powerpc/sysdev/mpc8xx_pic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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);
 


Patches currently in stable-queue which might be from christophe.leroy@c-s.fr are

queue-4.9/powerpc-8xx-fix-mpc8xx_get_irq-return-on-no-irq.patch