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ALSA: pcm: use helper function to refer parameter as read-only

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ALSA pcm core has hw_param_interval_c() to pick up parameter with const
qualifier for safe programming.

This commit applies it to the cases.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2017-05-17 08:48:20 +09:00 committed by Takashi Iwai
parent 8b674308a2
commit b55f9fdcd3
4 changed files with 10 additions and 8 deletions
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4
sound/core/oss/pcm_oss.c
View File

@ -799,7 +799,7 @@ static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
static int choose_rate(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, unsigned int best_rate)
{
struct snd_interval *it;
const struct snd_interval *it;
struct snd_pcm_hw_params *save;
unsigned int rate, prev;
@ -807,7 +807,7 @@ static int choose_rate(struct snd_pcm_substream *substream,
if (save == NULL)
return -ENOMEM;
*save = *params;
it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
/* try multiples of the best rate */
rate = best_rate;

8
sound/core/pcm_drm_eld.c
View File

@ -29,13 +29,13 @@ static int eld_limit_rates(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval *r = hw_param_interval(params, rule->var);
struct snd_interval *c;
const struct snd_interval *c;
unsigned int rate_mask = 7, i;
const u8 *sad, *eld = rule->private;
sad = drm_eld_sad(eld);
if (sad) {
c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
c = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3) {
unsigned max_channels = sad_max_channels(sad);
@ -57,7 +57,7 @@ static int eld_limit_channels(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval *c = hw_param_interval(params, rule->var);
struct snd_interval *r;
const struct snd_interval *r;
struct snd_interval t = { .min = 1, .max = 2, .integer = 1, };
unsigned int i;
const u8 *sad, *eld = rule->private;
@ -67,7 +67,7 @@ static int eld_limit_channels(struct snd_pcm_hw_params *params,
unsigned int rate_mask = 0;
/* Convert the rate interval to a mask */
r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
r = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
for (i = 0; i < ARRAY_SIZE(eld_rates); i++)
if (r->min <= eld_rates[i] && r->max >= eld_rates[i])
rate_mask |= BIT(i);

3
sound/core/pcm_lib.c
View File

@ -1415,7 +1415,8 @@ static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
unsigned int l = (unsigned long) rule->private;
int width = l & 0xffff;
unsigned int msbits = l >> 16;
struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
const struct snd_interval *i =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
if (!snd_interval_single(i))
return 0;

3
sound/core/pcm_native.c
View File

@ -1940,7 +1940,8 @@ static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
unsigned int k;
struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
const struct snd_interval *i =
hw_param_interval_c(params, rule->deps[0]);
struct snd_mask m;
struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
snd_mask_any(&m);