Re: [PATCH 3/5 v7] usb: musb: core: added missing const qualifier to musb_hdrc_platform_data::config

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Petr Kulhavy <petr@xxxxxxxxx> writes:

> The musb_hdrc_platform_data::config was defined as a non-const pointer.
> However some drivers (e.g. the ux500) set up this pointer to point to a
> static structure, which is potentially dangerous. Since the musb core
> uses the pointer in a read-only manner the const qualifier was added to
> protect the content of the config.
>
> Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx>
> Acked-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>

Bin, any inputs ?

> ---
> v5: <initial>
>
> v6:
>  - whitespace formatting corrected
>
> v7: <no change>
>
>  drivers/usb/musb/musb_core.c | 2 +-
>  drivers/usb/musb/musb_core.h | 2 +-
>  include/linux/usb/musb.h     | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index ff7f5d0..7e94d65 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -1938,7 +1938,7 @@ static void musb_recover_from_babble(struct musb *musb)
>   */
>
>  static struct musb *allocate_instance(struct device *dev,
> -		struct musb_hdrc_config *config, void __iomem *mbase)
> +		const struct musb_hdrc_config *config, void __iomem *mbase)
>  {
>  	struct musb		*musb;
>  	struct musb_hw_ep	*ep;
> diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
> index c2ee702..1d57f5c 100644
> --- a/drivers/usb/musb/musb_core.h
> +++ b/drivers/usb/musb/musb_core.h
> @@ -438,7 +438,7 @@ struct musb {
>  	 */
>  	unsigned                double_buffer_not_ok:1;
>
> -	struct musb_hdrc_config	*config;
> +	const struct musb_hdrc_config *config;
>
>  	int			xceiv_old_state;
>  #ifdef CONFIG_DEBUG_FS
> diff --git a/include/linux/usb/musb.h b/include/linux/usb/musb.h
> index 96ddfb7..0b3da40 100644
> --- a/include/linux/usb/musb.h
> +++ b/include/linux/usb/musb.h
> @@ -124,7 +124,7 @@ struct musb_hdrc_platform_data {
>  	int		(*set_power)(int state);
>
>  	/* MUSB configuration-specific details */
> -	struct musb_hdrc_config	*config;
> +	const struct musb_hdrc_config *config;
>
>  	/* Architecture specific board data	*/
>  	void		*board_data;
> --
> 1.9.1
>

-- 
balbi

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