linux-kernel - Re: SOLO6x10: fix a race in IRQ handler.

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Date:	Sat, 15 Nov 2014 11:39:37 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Andrey Utkin <andrey.utkin@...p.bluecherry.net>, khalasa@...p.pl,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	m.chehab@...sung.com
Subject: Re: SOLO6x10: fix a race in IRQ handler.

Hi Andrey,

Please always prefix the subject line with [PATCH] when you post a patch. That way it
will be picked up by patchwork (https://patchwork.linuxtv.org/project/linux-media/list/)
and the patch won't be lost.

Can you repost with such a prefix?

Thanks!

	Hans

On 11/15/2014 11:34 AM, Andrey Utkin wrote:
> From: khalasa@...p.pl (Krzysztof =?utf-8?Q?Ha=C5=82asa?=)
> 
> The IRQs have to be acknowledged before they are serviced, otherwise some events
> may be skipped. Also, acknowledging IRQs just before returning from the handler
> doesn't leave enough time for the device to deassert the INTx line, and for
> bridges to propagate this change. This resulted in twice the IRQ rate on ARMv6
> dual core CPU.
> 
> Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>
> Acked-by: Andrey Utkin <andrey.utkin@...p.bluecherry.net>
> Tested-by: Andrey Utkin <andrey.utkin@...p.bluecherry.net>
> 
> --- a/drivers/media/pci/solo6x10/solo6x10-core.c
> +++ b/drivers/media/pci/solo6x10/solo6x10-core.c
> @@ -105,11 +105,8 @@ static irqreturn_t solo_isr(int irq, void *data)
>  	if (!status)
>  		return IRQ_NONE;
>  
> -	if (status & ~solo_dev->irq_mask) {
> -		solo_reg_write(solo_dev, SOLO_IRQ_STAT,
> -			       status & ~solo_dev->irq_mask);
> -		status &= solo_dev->irq_mask;
> -	}
> +	/* Acknowledge all interrupts immediately */
> +	solo_reg_write(solo_dev, SOLO_IRQ_STAT, status);
>  
>  	if (status & SOLO_IRQ_PCI_ERR)
>  		solo_p2m_error_isr(solo_dev);
> @@ -132,9 +129,6 @@ static irqreturn_t solo_isr(int irq, void *data)
>  	if (status & SOLO_IRQ_G723)
>  		solo_g723_isr(solo_dev);
>  
> -	/* Clear all interrupts handled */
> -	solo_reg_write(solo_dev, SOLO_IRQ_STAT, status);
> -
>  	return IRQ_HANDLED;
>  }
> 
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