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%3Ba=su...

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