Re: [PATCH 3/9] ALSA: emu10k1: remove redundant variable attn

Takashi Iwai
2018-08-01T13:14:22Z

On Wed, 01 Aug 2018 15:03:45 +0200,
Walter Harms wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> Variable attn is being assigned but is never used hence it is
> redundant and can be removed.
>
> Cleans up clang warning:
> warning: variable 'attn' set but not used [-Wunused-but-set-variable]
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> sound/pci/emu10k1/emupcm.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/sound/pci/emu10k1/emupcm.c b/sound/pci/emu10k1/emupcm.c
> index 69f9b100bd24..26f6eda3e766 100644
> --- a/sound/pci/emu10k1/emupcm.c
> +++ b/sound/pci/emu10k1/emupcm.c
> @@ -290,7 +290,7 @@ static void snd_emu10k1_pcm_init_voice(struct snd_emu10k1
> *emu,
> struct snd_pcm_runtime *runtime = substream->runtime;
> unsigned int silent_page, tmp;
> int voice, stereo, w_16;
> - unsigned char attn, send_amount[8];
> + unsigned char send_amount[8];
> unsigned char send_routing[8];
> unsigned long flags;
> unsigned int pitch_target;
> @@ -313,7 +313,6 @@ static void snd_emu10k1_pcm_init_voice(struct snd_emu10k1
> *emu,
> /* volume parameters */
> if (extra) {
> - attn = 0;
> memset(send_routing, 0, sizeof(send_routing));
> send_routing[0] = 0;
> send_routing[1] = 1;
>
>
> IMHO, this code is a bit fishy.
> The memset() sould go in the init section
> and in the else branch tmp is set, maybe its an idea
> to set it here also (for symmetry)

What does it have to do with this patch...?

The code there is OK, although it could be a bit optimized with a
static array for the fixed routing. But it's pretty minor and it's no
hot path, so no need to bother complicating things.

thanks,

Takashi