linux-kernel - Re: [Patch v7 01/18] ACPI, irq: fix regression casued by 6b9fb7082409

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Date:	Tue, 28 Oct 2014 18:44:56 +0100
From:	Pavel Machek <pavel@....cz>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Len Brown <len.brown@...el.com>, x86@...nel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, rui.zhang@...el.com,
	linux-pm@...r.kernel.org
Subject: Re: [Patch v7 01/18] ACPI, irq: fix regression casued by 6b9fb7082409

Hi!

> When IOAPIC is disabled, acpi_gsi_to_irq() should return gsi directly
> instead of calling mp_map_gsi_to_irq() to translate gsi to IRQ by IOAPIC.
> It fixes https://bugzilla.kernel.org/show_bug.cgi?id=84381.
> 
> Reported-by: Thomas Richter <thor@...h.tu-berlin.de>
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> Cc: rui.zhang@...el.com
> Cc: <stable@...r.kernel.org> # 3.17
> ---
>  arch/x86/kernel/acpi/boot.c |   13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index b436fc735aa4..eceba9d9e116 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -604,14 +604,19 @@ void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
>  
>  int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
>  {
> -	int irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC | IOAPIC_MAP_CHECK);
> +	int irq;
>  
> -	if (irq >= 0) {
> +	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
> +		*irqp = gsi;

As you have multiple return points, anyway, I'd do return 0; here

> +	} else {
> +		irq = mp_map_gsi_to_irq(gsi,
> +					IOAPIC_MAP_ALLOC | IOAPIC_MAP_CHECK);
> +		if (irq < 0)
> +			return -1;
>  		*irqp = irq;
> -		return 0;
>  	}

...so that one level of nesting is avoided, and there are no problems
with fiting to 80 colums.

With that,

Acked-by: Pavel Machek <pavel@....cz>

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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