From e76bf3c4b4e456fa8f2c729fa1e8c644857529a8 Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Wed, 17 May 2017 08:48:19 +0900 Subject: ALSA: pcm/oss: refer to parameters instead of copying to reduce usage of kernel stack Some functions in compatibility layer for Open Sound System interface has local variable to copy some parameters in runtime of PCM substream, while this can be replaced with reference of pointers to parameter itself. This brings an advantage to reduce usage of kernel stack. This commit applies this idea. Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/core/oss/pcm_oss.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'sound/core/oss/pcm_oss.c') diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c index 2a473513bd54..e306f05ce51d 100644 --- a/sound/core/oss/pcm_oss.c +++ b/sound/core/oss/pcm_oss.c @@ -848,7 +848,7 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream, int direct; snd_pcm_format_t format, sformat; int n; - struct snd_mask sformat_mask; + const struct snd_mask *sformat_mask; struct snd_mask mask; if (trylock) { @@ -891,18 +891,18 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream, format = snd_pcm_oss_format_from(runtime->oss.format); - sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT); + sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT); if (direct) sformat = format; else - sformat = snd_pcm_plug_slave_format(format, &sformat_mask); + sformat = snd_pcm_plug_slave_format(format, sformat_mask); if ((__force int)sformat < 0 || - !snd_mask_test(&sformat_mask, (__force int)sformat)) { + !snd_mask_test(sformat_mask, (__force int)sformat)) { for (sformat = (__force snd_pcm_format_t)0; (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST; sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) { - if (snd_mask_test(&sformat_mask, (__force int)sformat) && + if (snd_mask_test(sformat_mask, (__force int)sformat) && snd_pcm_oss_format_to(sformat) >= 0) break; } @@ -1780,7 +1780,7 @@ static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file) int direct; struct snd_pcm_hw_params *params; unsigned int formats = 0; - struct snd_mask format_mask; + const struct snd_mask *format_mask; int fmt; if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0) @@ -1802,12 +1802,12 @@ static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file) return -ENOMEM; _snd_pcm_hw_params_any(params); err = snd_pcm_hw_refine(substream, params); - format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); + format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); kfree(params); if (err < 0) return err; for (fmt = 0; fmt < 32; ++fmt) { - if (snd_mask_test(&format_mask, fmt)) { + if (snd_mask_test(format_mask, fmt)) { int f = snd_pcm_oss_format_to(fmt); if (f >= 0) formats |= f; -- cgit v1.2.1