linux-kernel - Re: [PATCH, RFC 05/30] [media] omap_vout: avoid sleep

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Message-ID: <52D90490.3080407@xs4all.nl>
Date:	Fri, 17 Jan 2014 11:23:12 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Arnd Bergmann <arnd@...db.de>
CC:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH, RFC 05/30] [media] omap_vout: avoid sleep_on race

Hi Arnd,

On 01/02/2014 01:07 PM, Arnd Bergmann wrote:
> sleep_on and its variants are broken and going away soon. This changes
> the omap vout driver to use interruptible_sleep_on_timeout instead,

I assume you mean wait_event_interruptible_timeout here :-)

Reviewed-by: Hans Verkuil <hans.verkuil@...co.com>

If there are no other comments, then I plan to merge this next week.

Regards,

	Hans

> which fixes potential race where the dma is complete before we
> schedule.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Mauro Carvalho Chehab <m.chehab@...sung.com>
> Cc: linux-media@...r.kernel.org
> ---
>  drivers/media/platform/omap/omap_vout_vrfb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/omap/omap_vout_vrfb.c b/drivers/media/platform/omap/omap_vout_vrfb.c
> index cf1c437..62e7e57 100644
> --- a/drivers/media/platform/omap/omap_vout_vrfb.c
> +++ b/drivers/media/platform/omap/omap_vout_vrfb.c
> @@ -270,7 +270,8 @@ int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
>  	omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE, 0x20, 0);
>  
>  	omap_start_dma(tx->dma_ch);
> -	interruptible_sleep_on_timeout(&tx->wait, VRFB_TX_TIMEOUT);
> +	wait_event_interruptible_timeout(tx->wait, tx->tx_status == 1,
> +					 VRFB_TX_TIMEOUT);
>  
>  	if (tx->tx_status == 0) {
>  		omap_stop_dma(tx->dma_ch);
> 

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