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Date:   Fri, 1 Jan 2021 14:50:25 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Paul Mundt <lethal@...ux-sh.org>,
        Guenter Roeck <linux@...ck-us.net>, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: check return code of request_irq

Hi Nick!

On 12/22/20 9:54 PM, Nick Desaulniers wrote:
> request_irq is marked __must_check, but the call in shx3_prepare_cpus
> has a void return type, so it can't propagate failure to the caller.
> Follow cues from hexagon and just print an error.
> 
> Fixes: c7936b9abcf5 ("sh: smp: Hook in to the generic IPI handler for SH-X3 SMP.")
> Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  arch/sh/kernel/cpu/sh4a/smp-shx3.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/sh/kernel/cpu/sh4a/smp-shx3.c b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
> index f8a2bec0f260..1261dc7b84e8 100644
> --- a/arch/sh/kernel/cpu/sh4a/smp-shx3.c
> +++ b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
> @@ -73,8 +73,9 @@ static void shx3_prepare_cpus(unsigned int max_cpus)
>  	BUILD_BUG_ON(SMP_MSG_NR >= 8);
>  
>  	for (i = 0; i < SMP_MSG_NR; i++)
> -		request_irq(104 + i, ipi_interrupt_handler,
> -			    IRQF_PERCPU, "IPI", (void *)(long)i);
> +		if (request_irq(104 + i, ipi_interrupt_handler,
> +			    IRQF_PERCPU, "IPI", (void *)(long)i))
> +			pr_err("Failed to request irq %d\n", i);
>  
>  	for (i = 0; i < max_cpus; i++)
>  		set_cpu_present(i, true);
> 

Verified on my SH-7785LCR board. Boots fine.

Tested-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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