[PATCH 01/18] video/hdmi: Constify 'buffer' to the unpack functions

[Hans Verkuil]

On 09/20/18 20:51, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> The unpack functions just read from the passed in buffer,
> so make it const.
> 
> Cc: Thierry Reding <thierry.reding at gmail.com>
> Cc: Hans Verkuil <hans.verkuil at cisco.com>

Acked-by: Hans Verkuil <hans.verkuil at cisco.com>

Thanks!

	Hans

> Cc: linux-media at vger.kernel.org
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/video/hdmi.c | 23 ++++++++++++-----------
>  include/linux/hdmi.h |  3 ++-
>  2 files changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
> index 38716eb50408..65b915ea4936 100644
> --- a/drivers/video/hdmi.c
> +++ b/drivers/video/hdmi.c
> @@ -31,7 +31,7 @@
>  
>  #define hdmi_log(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
>  
> -static u8 hdmi_infoframe_checksum(u8 *ptr, size_t size)
> +static u8 hdmi_infoframe_checksum(const u8 *ptr, size_t size)
>  {
>  	u8 csum = 0;
>  	size_t i;
> @@ -1016,9 +1016,9 @@ EXPORT_SYMBOL(hdmi_infoframe_log);
>   * Returns 0 on success or a negative error code on failure.
>   */
>  static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
> -				     void *buffer)
> +				     const void *buffer)
>  {
> -	u8 *ptr = buffer;
> +	const u8 *ptr = buffer;
>  	int ret;
>  
>  	if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI ||
> @@ -1079,9 +1079,9 @@ static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
>   * Returns 0 on success or a negative error code on failure.
>   */
>  static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
> -				     void *buffer)
> +				     const void *buffer)
>  {
> -	u8 *ptr = buffer;
> +	const u8 *ptr = buffer;
>  	int ret;
>  
>  	if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD ||
> @@ -1117,9 +1117,9 @@ static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
>   * Returns 0 on success or a negative error code on failure.
>   */
>  static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
> -				       void *buffer)
> +				       const void *buffer)
>  {
> -	u8 *ptr = buffer;
> +	const u8 *ptr = buffer;
>  	int ret;
>  
>  	if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO ||
> @@ -1163,9 +1163,9 @@ static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
>   */
>  static int
>  hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
> -				 void *buffer)
> +				 const void *buffer)
>  {
> -	u8 *ptr = buffer;
> +	const u8 *ptr = buffer;
>  	size_t length;
>  	int ret;
>  	u8 hdmi_video_format;
> @@ -1234,10 +1234,11 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
>   *
>   * Returns 0 on success or a negative error code on failure.
>   */
> -int hdmi_infoframe_unpack(union hdmi_infoframe *frame, void *buffer)
> +int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
> +			  const void *buffer)
>  {
>  	int ret;
> -	u8 *ptr = buffer;
> +	const u8 *ptr = buffer;
>  
>  	switch (ptr[0]) {
>  	case HDMI_INFOFRAME_TYPE_AVI:
> diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
> index d271ff23984f..d3816170c062 100644
> --- a/include/linux/hdmi.h
> +++ b/include/linux/hdmi.h
> @@ -332,7 +332,8 @@ union hdmi_infoframe {
>  
>  ssize_t
>  hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size);
> -int hdmi_infoframe_unpack(union hdmi_infoframe *frame, void *buffer);
> +int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
> +			  const void *buffer);
>  void hdmi_infoframe_log(const char *level, struct device *dev,
>  			union hdmi_infoframe *frame);
>  
>