Re: [PATCH v2] ALSA: bebob: constify snd_bebob_rate_spec structures

[Takashi Sakamoto]

Hi,

On Oct 11 2015 06:24, Julia Lawall wrote:
> The structures of type snd_bebob_clock_spec, snd_bebob_rate_spec,
> snd_bebob_meter_spec, and snd_bebob_spec are never modified after they are
> initialized.  Make them all const.
> 
> Done with the help of Coccinelle.
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx>
> 
> ---
> 
> v2: extend to snd_bebob_clock_spec, snd_bebob_meter_spec, and 
> snd_bebob_spec structures.
> 
>  sound/firewire/bebob/bebob.c           |    2 +-
>  sound/firewire/bebob/bebob.h           |   32 ++++++++++++++++----------------
>  sound/firewire/bebob/bebob_focusrite.c |   26 +++++++++++++-------------
>  sound/firewire/bebob/bebob_maudio.c    |   32 ++++++++++++++++----------------
>  sound/firewire/bebob/bebob_pcm.c       |    2 +-
>  sound/firewire/bebob/bebob_proc.c      |    6 +++---
>  sound/firewire/bebob/bebob_stream.c    |    6 +++---
>  sound/firewire/bebob/bebob_terratec.c  |   10 +++++-----
>  sound/firewire/bebob/bebob_yamaha.c    |    6 +++---
>  9 files changed, 61 insertions(+), 61 deletions(-)

Tested-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
Reviewed-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>

Thank you to include my extra request and spend more time for this patch ;)

But I prefer to change the title of this patch to 'ALSA: bebob: constify
some structures because they are never modified' or something like it
because this patch is not only for 'struct snd_bebob_rate_spec'.


Thanks

Takashi Sakamoto

> diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c
> index 0ed5e5f..091290d 100644
> --- a/sound/firewire/bebob/bebob.c
> +++ b/sound/firewire/bebob/bebob.c
> @@ -335,7 +335,7 @@ static void bebob_remove(struct fw_unit *unit)
>  	snd_card_free_when_closed(bebob->card);
>  }
>  
> -static struct snd_bebob_rate_spec normal_rate_spec = {
> +static const struct snd_bebob_rate_spec normal_rate_spec = {
>  	.get	= &snd_bebob_stream_get_rate,
>  	.set	= &snd_bebob_stream_set_rate
>  };
> diff --git a/sound/firewire/bebob/bebob_focusrite.c b/sound/firewire/bebob/bebob_focusrite.c
> index a1a3949..f110900 100644
> --- a/sound/firewire/bebob/bebob_focusrite.c
> +++ b/sound/firewire/bebob/bebob_focusrite.c
> @@ -200,7 +200,7 @@ end:
>  	return err;
>  }
>  
> -struct snd_bebob_spec saffire_le_spec;
> +const struct snd_bebob_spec saffire_le_spec;
>  static enum snd_bebob_clock_type saffire_both_clk_src_types[] = {
>  	SND_BEBOB_CLOCK_TYPE_INTERNAL,
>  	SND_BEBOB_CLOCK_TYPE_EXTERNAL,
> @@ -229,7 +229,7 @@ static const char *const saffire_meter_labels[] = {
>  static int
>  saffire_meter_get(struct snd_bebob *bebob, u32 *buf, unsigned int size)
>  {
> -	struct snd_bebob_meter_spec *spec = bebob->spec->meter;
> +	const struct snd_bebob_meter_spec *spec = bebob->spec->meter;
>  	unsigned int channels;
>  	u64 offset;
>  	int err;
> @@ -260,60 +260,60 @@ saffire_meter_get(struct snd_bebob *bebob, u32 *buf, unsigned int size)
>  	return err;
>  }
>  
> -static struct snd_bebob_rate_spec saffirepro_both_rate_spec = {
> +static const struct snd_bebob_rate_spec saffirepro_both_rate_spec = {
>  	.get	= &saffirepro_both_clk_freq_get,
>  	.set	= &saffirepro_both_clk_freq_set,
>  };
>  /* Saffire Pro 26 I/O  */
> -static struct snd_bebob_clock_spec saffirepro_26_clk_spec = {
> +static const struct snd_bebob_clock_spec saffirepro_26_clk_spec = {
>  	.num	= ARRAY_SIZE(saffirepro_26_clk_src_types),
>  	.types	= saffirepro_26_clk_src_types,
>  	.get	= &saffirepro_both_clk_src_get,
>  };
> -struct snd_bebob_spec saffirepro_26_spec = {
> +const struct snd_bebob_spec saffirepro_26_spec = {
>  	.clock	= &saffirepro_26_clk_spec,
>  	.rate	= &saffirepro_both_rate_spec,
>  	.meter	= NULL
>  };
>  /* Saffire Pro 10 I/O */
> -static struct snd_bebob_clock_spec saffirepro_10_clk_spec = {
> +static const struct snd_bebob_clock_spec saffirepro_10_clk_spec = {
>  	.num	= ARRAY_SIZE(saffirepro_10_clk_src_types),
>  	.types	= saffirepro_10_clk_src_types,
>  	.get	= &saffirepro_both_clk_src_get,
>  };
> -struct snd_bebob_spec saffirepro_10_spec = {
> +const struct snd_bebob_spec saffirepro_10_spec = {
>  	.clock	= &saffirepro_10_clk_spec,
>  	.rate	= &saffirepro_both_rate_spec,
>  	.meter	= NULL
>  };
>  
> -static struct snd_bebob_rate_spec saffire_both_rate_spec = {
> +static const struct snd_bebob_rate_spec saffire_both_rate_spec = {
>  	.get	= &snd_bebob_stream_get_rate,
>  	.set	= &snd_bebob_stream_set_rate,
>  };
> -static struct snd_bebob_clock_spec saffire_both_clk_spec = {
> +static const struct snd_bebob_clock_spec saffire_both_clk_spec = {
>  	.num	= ARRAY_SIZE(saffire_both_clk_src_types),
>  	.types	= saffire_both_clk_src_types,
>  	.get	= &saffire_both_clk_src_get,
>  };
>  /* Saffire LE */
> -static struct snd_bebob_meter_spec saffire_le_meter_spec = {
> +static const struct snd_bebob_meter_spec saffire_le_meter_spec = {
>  	.num	= ARRAY_SIZE(saffire_le_meter_labels),
>  	.labels	= saffire_le_meter_labels,
>  	.get	= &saffire_meter_get,
>  };
> -struct snd_bebob_spec saffire_le_spec = {
> +const struct snd_bebob_spec saffire_le_spec = {
>  	.clock	= &saffire_both_clk_spec,
>  	.rate	= &saffire_both_rate_spec,
>  	.meter	= &saffire_le_meter_spec
>  };
>  /* Saffire */
> -static struct snd_bebob_meter_spec saffire_meter_spec = {
> +static const struct snd_bebob_meter_spec saffire_meter_spec = {
>  	.num	= ARRAY_SIZE(saffire_meter_labels),
>  	.labels	= saffire_meter_labels,
>  	.get	= &saffire_meter_get,
>  };
> -struct snd_bebob_spec saffire_spec = {
> +const struct snd_bebob_spec saffire_spec = {
>  	.clock	= &saffire_both_clk_spec,
>  	.rate	= &saffire_both_rate_spec,
>  	.meter	= &saffire_meter_spec
> diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
> index d3c9d8d..4d8fcc7 100644
> --- a/sound/firewire/bebob/bebob.h
> +++ b/sound/firewire/bebob/bebob.h
> @@ -70,9 +70,9 @@ struct snd_bebob_meter_spec {
>  	int (*get)(struct snd_bebob *bebob, u32 *target, unsigned int size);
>  };
>  struct snd_bebob_spec {
> -	struct snd_bebob_clock_spec *clock;
> -	struct snd_bebob_rate_spec *rate;
> -	struct snd_bebob_meter_spec *meter;
> +	const struct snd_bebob_clock_spec *clock;
> +	const struct snd_bebob_rate_spec *rate;
> +	const struct snd_bebob_meter_spec *meter;
>  };
>  
>  struct snd_bebob {
> @@ -235,19 +235,19 @@ int snd_bebob_create_pcm_devices(struct snd_bebob *bebob);
>  int snd_bebob_create_hwdep_device(struct snd_bebob *bebob);
>  
>  /* model specific operations */
> -extern struct snd_bebob_spec phase88_rack_spec;
> -extern struct snd_bebob_spec phase24_series_spec;
> -extern struct snd_bebob_spec yamaha_go_spec;
> -extern struct snd_bebob_spec saffirepro_26_spec;
> -extern struct snd_bebob_spec saffirepro_10_spec;
> -extern struct snd_bebob_spec saffire_le_spec;
> -extern struct snd_bebob_spec saffire_spec;
> -extern struct snd_bebob_spec maudio_fw410_spec;
> -extern struct snd_bebob_spec maudio_audiophile_spec;
> -extern struct snd_bebob_spec maudio_solo_spec;
> -extern struct snd_bebob_spec maudio_ozonic_spec;
> -extern struct snd_bebob_spec maudio_nrv10_spec;
> -extern struct snd_bebob_spec maudio_special_spec;
> +extern const struct snd_bebob_spec phase88_rack_spec;
> +extern const struct snd_bebob_spec phase24_series_spec;
> +extern const struct snd_bebob_spec yamaha_go_spec;
> +extern const struct snd_bebob_spec saffirepro_26_spec;
> +extern const struct snd_bebob_spec saffirepro_10_spec;
> +extern const struct snd_bebob_spec saffire_le_spec;
> +extern const struct snd_bebob_spec saffire_spec;
> +extern const struct snd_bebob_spec maudio_fw410_spec;
> +extern const struct snd_bebob_spec maudio_audiophile_spec;
> +extern const struct snd_bebob_spec maudio_solo_spec;
> +extern const struct snd_bebob_spec maudio_ozonic_spec;
> +extern const struct snd_bebob_spec maudio_nrv10_spec;
> +extern const struct snd_bebob_spec maudio_special_spec;
>  int snd_bebob_maudio_special_discover(struct snd_bebob *bebob, bool is1814);
>  int snd_bebob_maudio_load_firmware(struct fw_unit *unit);
>  
> diff --git a/sound/firewire/bebob/bebob_maudio.c b/sound/firewire/bebob/bebob_maudio.c
> index 057495d..7b86a6b 100644
> --- a/sound/firewire/bebob/bebob_maudio.c
> +++ b/sound/firewire/bebob/bebob_maudio.c
> @@ -687,7 +687,7 @@ static const char *const nrv10_meter_labels[] = {
>  static int
>  normal_meter_get(struct snd_bebob *bebob, u32 *buf, unsigned int size)
>  {
> -	struct snd_bebob_meter_spec *spec = bebob->spec->meter;
> +	const struct snd_bebob_meter_spec *spec = bebob->spec->meter;
>  	unsigned int c, channels;
>  	int err;
>  
> @@ -712,85 +712,85 @@ end:
>  }
>  
>  /* for special customized devices */
> -static struct snd_bebob_rate_spec special_rate_spec = {
> +static const struct snd_bebob_rate_spec special_rate_spec = {
>  	.get	= &special_get_rate,
>  	.set	= &special_set_rate,
>  };
> -static struct snd_bebob_clock_spec special_clk_spec = {
> +static const struct snd_bebob_clock_spec special_clk_spec = {
>  	.num	= ARRAY_SIZE(special_clk_types),
>  	.types	= special_clk_types,
>  	.get	= &special_clk_get,
>  };
> -static struct snd_bebob_meter_spec special_meter_spec = {
> +static const struct snd_bebob_meter_spec special_meter_spec = {
>  	.num	= ARRAY_SIZE(special_meter_labels),
>  	.labels	= special_meter_labels,
>  	.get	= &special_meter_get
>  };
> -struct snd_bebob_spec maudio_special_spec = {
> +const struct snd_bebob_spec maudio_special_spec = {
>  	.clock	= &special_clk_spec,
>  	.rate	= &special_rate_spec,
>  	.meter	= &special_meter_spec
>  };
>  
>  /* Firewire 410 specification */
> -static struct snd_bebob_rate_spec usual_rate_spec = {
> +static const struct snd_bebob_rate_spec usual_rate_spec = {
>  	.get	= &snd_bebob_stream_get_rate,
>  	.set	= &snd_bebob_stream_set_rate,
>  };
> -static struct snd_bebob_meter_spec fw410_meter_spec = {
> +static const struct snd_bebob_meter_spec fw410_meter_spec = {
>  	.num	= ARRAY_SIZE(fw410_meter_labels),
>  	.labels	= fw410_meter_labels,
>  	.get	= &normal_meter_get
>  };
> -struct snd_bebob_spec maudio_fw410_spec = {
> +const struct snd_bebob_spec maudio_fw410_spec = {
>  	.clock	= NULL,
>  	.rate	= &usual_rate_spec,
>  	.meter	= &fw410_meter_spec
>  };
>  
>  /* Firewire Audiophile specification */
> -static struct snd_bebob_meter_spec audiophile_meter_spec = {
> +static const struct snd_bebob_meter_spec audiophile_meter_spec = {
>  	.num	= ARRAY_SIZE(audiophile_meter_labels),
>  	.labels	= audiophile_meter_labels,
>  	.get	= &normal_meter_get
>  };
> -struct snd_bebob_spec maudio_audiophile_spec = {
> +const struct snd_bebob_spec maudio_audiophile_spec = {
>  	.clock	= NULL,
>  	.rate	= &usual_rate_spec,
>  	.meter	= &audiophile_meter_spec
>  };
>  
>  /* Firewire Solo specification */
> -static struct snd_bebob_meter_spec solo_meter_spec = {
> +static const struct snd_bebob_meter_spec solo_meter_spec = {
>  	.num	= ARRAY_SIZE(solo_meter_labels),
>  	.labels	= solo_meter_labels,
>  	.get	= &normal_meter_get
>  };
> -struct snd_bebob_spec maudio_solo_spec = {
> +const struct snd_bebob_spec maudio_solo_spec = {
>  	.clock	= NULL,
>  	.rate	= &usual_rate_spec,
>  	.meter	= &solo_meter_spec
>  };
>  
>  /* Ozonic specification */
> -static struct snd_bebob_meter_spec ozonic_meter_spec = {
> +static const struct snd_bebob_meter_spec ozonic_meter_spec = {
>  	.num	= ARRAY_SIZE(ozonic_meter_labels),
>  	.labels	= ozonic_meter_labels,
>  	.get	= &normal_meter_get
>  };
> -struct snd_bebob_spec maudio_ozonic_spec = {
> +const struct snd_bebob_spec maudio_ozonic_spec = {
>  	.clock	= NULL,
>  	.rate	= &usual_rate_spec,
>  	.meter	= &ozonic_meter_spec
>  };
>  
>  /* NRV10 specification */
> -static struct snd_bebob_meter_spec nrv10_meter_spec = {
> +static const struct snd_bebob_meter_spec nrv10_meter_spec = {
>  	.num	= ARRAY_SIZE(nrv10_meter_labels),
>  	.labels	= nrv10_meter_labels,
>  	.get	= &normal_meter_get
>  };
> -struct snd_bebob_spec maudio_nrv10_spec = {
> +const struct snd_bebob_spec maudio_nrv10_spec = {
>  	.clock	= NULL,
>  	.rate	= &usual_rate_spec,
>  	.meter	= &nrv10_meter_spec
> diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
> index 2fdc1f1..ef224d6 100644
> --- a/sound/firewire/bebob/bebob_pcm.c
> +++ b/sound/firewire/bebob/bebob_pcm.c
> @@ -155,7 +155,7 @@ static int
>  pcm_open(struct snd_pcm_substream *substream)
>  {
>  	struct snd_bebob *bebob = substream->private_data;
> -	struct snd_bebob_rate_spec *spec = bebob->spec->rate;
> +	const struct snd_bebob_rate_spec *spec = bebob->spec->rate;
>  	unsigned int sampling_rate;
>  	enum snd_bebob_clock_type src;
>  	int err;
> diff --git a/sound/firewire/bebob/bebob_proc.c b/sound/firewire/bebob/bebob_proc.c
> index 301cc6a..ec24f96 100644
> --- a/sound/firewire/bebob/bebob_proc.c
> +++ b/sound/firewire/bebob/bebob_proc.c
> @@ -73,7 +73,7 @@ proc_read_meters(struct snd_info_entry *entry,
>  		 struct snd_info_buffer *buffer)
>  {
>  	struct snd_bebob *bebob = entry->private_data;
> -	struct snd_bebob_meter_spec *spec = bebob->spec->meter;
> +	const struct snd_bebob_meter_spec *spec = bebob->spec->meter;
>  	u32 *buf;
>  	unsigned int i, c, channels, size;
>  
> @@ -138,8 +138,8 @@ proc_read_clock(struct snd_info_entry *entry,
>  		"SYT-Match",
>  	};
>  	struct snd_bebob *bebob = entry->private_data;
> -	struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
> -	struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
> +	const struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
> +	const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
>  	enum snd_bebob_clock_type src;
>  	unsigned int rate;
>  
> diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
> index a2baa47..926e5dc 100644
> --- a/sound/firewire/bebob/bebob_stream.c
> +++ b/sound/firewire/bebob/bebob_stream.c
> @@ -119,7 +119,7 @@ end:
>  int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
>  				   enum snd_bebob_clock_type *src)
>  {
> -	struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
> +	const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
>  	u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
>  	unsigned int id;
>  	enum avc_bridgeco_plug_type type;
> @@ -580,7 +580,7 @@ end:
>  
>  int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate)
>  {
> -	struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
> +	const struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
>  	struct amdtp_stream *master, *slave;
>  	enum cip_flags sync_mode;
>  	unsigned int curr_rate;
> @@ -967,7 +967,7 @@ end:
>  
>  int snd_bebob_stream_discover(struct snd_bebob *bebob)
>  {
> -	struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
> +	const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
>  	u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
>  	enum avc_bridgeco_plug_type type;
>  	unsigned int i;
> diff --git a/sound/firewire/bebob/bebob_terratec.c b/sound/firewire/bebob/bebob_terratec.c
> index 9242e33..c38358b 100644
> --- a/sound/firewire/bebob/bebob_terratec.c
> +++ b/sound/firewire/bebob/bebob_terratec.c
> @@ -55,30 +55,30 @@ phase24_series_clk_src_get(struct snd_bebob *bebob, unsigned int *id)
>  	return 0;
>  }
>  
> -static struct snd_bebob_rate_spec phase_series_rate_spec = {
> +static const struct snd_bebob_rate_spec phase_series_rate_spec = {
>  	.get	= &snd_bebob_stream_get_rate,
>  	.set	= &snd_bebob_stream_set_rate,
>  };
>  
>  /* PHASE 88 Rack FW */
> -static struct snd_bebob_clock_spec phase88_rack_clk = {
> +static const struct snd_bebob_clock_spec phase88_rack_clk = {
>  	.num	= ARRAY_SIZE(phase88_rack_clk_src_types),
>  	.types	= phase88_rack_clk_src_types,
>  	.get	= &phase88_rack_clk_src_get,
>  };
> -struct snd_bebob_spec phase88_rack_spec = {
> +const struct snd_bebob_spec phase88_rack_spec = {
>  	.clock	= &phase88_rack_clk,
>  	.rate	= &phase_series_rate_spec,
>  	.meter	= NULL
>  };
>  
>  /* 'PHASE 24 FW' and 'PHASE X24 FW' */
> -static struct snd_bebob_clock_spec phase24_series_clk = {
> +static const struct snd_bebob_clock_spec phase24_series_clk = {
>  	.num	= ARRAY_SIZE(phase24_series_clk_src_types),
>  	.types	= phase24_series_clk_src_types,
>  	.get	= &phase24_series_clk_src_get,
>  };
> -struct snd_bebob_spec phase24_series_spec = {
> +const struct snd_bebob_spec phase24_series_spec = {
>  	.clock	= &phase24_series_clk,
>  	.rate	= &phase_series_rate_spec,
>  	.meter	= NULL
> diff --git a/sound/firewire/bebob/bebob_yamaha.c b/sound/firewire/bebob/bebob_yamaha.c
> index 5810170..90d4404 100644
> --- a/sound/firewire/bebob/bebob_yamaha.c
> +++ b/sound/firewire/bebob/bebob_yamaha.c
> @@ -46,16 +46,16 @@ clk_src_get(struct snd_bebob *bebob, unsigned int *id)
>  
>  	return 0;
>  }
> -static struct snd_bebob_clock_spec clock_spec = {
> +static const struct snd_bebob_clock_spec clock_spec = {
>  	.num	= ARRAY_SIZE(clk_src_types),
>  	.types	= clk_src_types,
>  	.get	= &clk_src_get,
>  };
> -static struct snd_bebob_rate_spec rate_spec = {
> +static const struct snd_bebob_rate_spec rate_spec = {
>  	.get	= &snd_bebob_stream_get_rate,
>  	.set	= &snd_bebob_stream_set_rate,
>  };
> -struct snd_bebob_spec yamaha_go_spec = {
> +const struct snd_bebob_spec yamaha_go_spec = {
>  	.clock	= &clock_spec,
>  	.rate	= &rate_spec,
>  	.meter	= NULL

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