Re: [PATCH] SOLO6x10: don't do DMA from stack in solo_dma_vin_region().

[Hans Verkuil <hverkuil@xs4all.nl>]

Ismael,

Can you Ack these four patches?

Regards,

	Hans

On 09/12/2013 02:25 PM, Krzysztof Hałasa wrote:
> Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl>
> 
> diff --git a/drivers/staging/media/solo6x10/solo6x10-disp.c b/drivers/staging/media/solo6x10/solo6x10-disp.c
> index 32d9953..884512e 100644
> --- a/drivers/staging/media/solo6x10/solo6x10-disp.c
> +++ b/drivers/staging/media/solo6x10/solo6x10-disp.c
> @@ -176,18 +176,26 @@ static void solo_vout_config(struct solo_dev *solo_dev)
>  static int solo_dma_vin_region(struct solo_dev *solo_dev, u32 off,
>  			       u16 val, int reg_size)
>  {
> -	u16 buf[64];
> -	int i;
> -	int ret = 0;
> +	u16 *buf;
> +	const int n = 64, size = n * sizeof(*buf);
> +	int i, ret = 0;
> +
> +	if (!(buf = kmalloc(size, GFP_KERNEL)))
> +		return -ENOMEM;
>  
> -	for (i = 0; i < sizeof(buf) >> 1; i++)
> +	for (i = 0; i < n; i++)
>  		buf[i] = cpu_to_le16(val);
>  
> -	for (i = 0; i < reg_size; i += sizeof(buf))
> -		ret |= solo_p2m_dma(solo_dev, 1, buf,
> -				    SOLO_MOTION_EXT_ADDR(solo_dev) + off + i,
> -				    sizeof(buf), 0, 0);
> +	for (i = 0; i < reg_size; i += size) {
> +		ret = solo_p2m_dma(solo_dev, 1, buf,
> +				   SOLO_MOTION_EXT_ADDR(solo_dev) + off + i,
> +				   size, 0, 0);
> +
> +		if (ret)
> +			break;
> +	}
>  
> +	kfree(buf);
>  	return ret;
>  }
>  
> --
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