On Tue, Jan 06, 2015 at 03:48:19PM +0100, Philipp Zabel wrote:
> If the i2c device tree nodes don't contain the dmas and dma-names property, an
> error is displayed for each i2c device:
> 
>     of_dma_request_slave_channel: dma-names property of node '/soc/aips-bus@02100000/i2c@021a0000' missing or empty
> 
> This patch avoids calling dma_request_slave_channel if the dma-names property
> does not exist in the device tree in the first place.
> 
> Signed-off-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>

Aren't you curing the symptoms instead of the cause? Sending a
counterpatch in a second...

> ---
>  drivers/i2c/busses/i2c-imx.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 7f3a9fe..f0d9904 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -288,6 +288,9 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
>  	struct device *dev = &i2c_imx->adapter.dev;
>  	int ret;
>  
> +	if (!of_get_property(dev->of_node, "dma-names", NULL))
> +		return;
> +
>  	dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
>  	if (!dma)
>  		return;
> -- 
> 2.1.4
>