Re: [PATCH V2 1/4] pinctrl: imx: prepare for making "group_names" in "function_desc" const

[Abel Vesa <abel.vesa@xxxxxxx>]

On 21-12-16 17:22:03, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@xxxxxxxxxx>
> 
> The plan for "struct function_desc" is to make its "group_names"
> /double/ const. That will allow drivers to use it with static const
> data.
> 
> This imx change is required to avoid:
> drivers/pinctrl/freescale/pinctrl-imx.c: In function 'imx_pinctrl_parse_functions':
> drivers/pinctrl/freescale/pinctrl-imx.c:672:24: error: assignment of read-only location '*(func->group_names + (sizetype)(i * 4))'
>   672 |   func->group_names[i] = child->name;
>       |                        ^
> 
> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
> ---
>  drivers/pinctrl/freescale/pinctrl-imx.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index daf28bc5661d..47b2ab1a14d0 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -648,6 +648,7 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
>  	struct device_node *child;
>  	struct function_desc *func;
>  	struct group_desc *grp;
> +	const char **group_names;
>  	u32 i = 0;
>  
>  	dev_dbg(pctl->dev, "parse function(%d): %pOFn\n", index, np);
> @@ -663,14 +664,16 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
>  		dev_err(ipctl->dev, "no groups defined in %pOF\n", np);
>  		return -EINVAL;
>  	}
> -	func->group_names = devm_kcalloc(ipctl->dev, func->num_group_names,
> -					 sizeof(char *), GFP_KERNEL);
> +
> +	group_names = devm_kcalloc(ipctl->dev, func->num_group_names,
> +				   sizeof(char *), GFP_KERNEL);
>  	if (!func->group_names)
This line needs to be:
  	if (!group_names)

Otherwise, the driver never probes successufully.

Linus, maybe you can squashed this fix in your tree without a resend.

>  		return -ENOMEM;
> +	for_each_child_of_node(np, child)
> +		group_names[i] = child->name;
> +	func->group_names = group_names;
>  
>  	for_each_child_of_node(np, child) {
> -		func->group_names[i] = child->name;
> -
>  		grp = devm_kzalloc(ipctl->dev, sizeof(struct group_desc),
>  				   GFP_KERNEL);
>  		if (!grp) {
> -- 
> 2.31.1
>