linux-kernel - Re: [PATCH] MIPS: IRQ Stack: Fix erroneous jal to plat_irq

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Message-ID: <20170211214941.GC9246@jhogan-linux.le.imgtec.org>
Date:   Sat, 11 Feb 2017 21:49:41 +0000
From:   James Hogan <james.hogan@...tec.com>
To:     Matt Redfearn <matt.redfearn@...tec.com>
CC:     Ralf Baechle <ralf@...ux-mips.org>, <linux-mips@...ux-mips.org>,
        <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...tec.com>
Subject: Re: [PATCH] MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch

On Wed, Jan 25, 2017 at 05:00:25PM +0000, Matt Redfearn wrote:
> Commit dda45f701c9d ("MIPS: Switch to the irq_stack in interrupts")
> changed both the normal and vectored interrupt handlers. Unfortunately
> the vectored version, "except_vec_vi_handler", was incorrectly modified
> to unconditionally jal to plat_irq_dispatch, rather than doing a jalr to
> the vectored handler that has been set up. This is ok for many platforms
> which set the vectored handler to plat_irq_dispatch anyway, but will
> cause problems with platforms that use other handlers.
> 
> Fixes: dda45f701c9d ("MIPS: Switch to the irq_stack in interrupts")
> Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>

Applied

Thanks
James

> ---
> 
> Ralf, if possible please could you squash this?
> 
> ---
>  arch/mips/kernel/genex.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
> index 0a7ba4b2f687..7ec9612cb007 100644
> --- a/arch/mips/kernel/genex.S
> +++ b/arch/mips/kernel/genex.S
> @@ -329,7 +329,7 @@ NESTED(except_vec_vi_handler, 0, sp)
>  	PTR_ADD sp, t0, t1
>  
>  2:
> -	jal	plat_irq_dispatch
> +	jalr	v0
>  
>  	/* Restore sp */
>  	move	sp, s1
> -- 
> 2.7.4
> 

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