[alsa-devel] [PATCH] pcm: returning semop error code for semaphore up/down failures.

[Takashi Iwai]

On Mon, 09 Jan 2017 12:24:11 +0100,
sutar.mounesh at gmail.com wrote:
> 
> From: Mounesh Sutar <sutar.mounesh at gmail.com>
> 
> Signed-off-by: Mounesh Sutar <sutar.mounesh at gmail.com>
> 
> diff --git a/src/pcm/pcm_direct.h b/src/pcm/pcm_direct.h
> index 91e816c..a7c0439 100644
> --- a/src/pcm/pcm_direct.h
> +++ b/src/pcm/pcm_direct.h
> @@ -263,7 +263,12 @@ static inline int snd_pcm_direct_semaphore_down(snd_pcm_direct_t *dmix, int sem_
>  {
>  	struct sembuf op[2] = { { sem_num, 0, 0 }, { sem_num, 1, SEM_UNDO } };
>  	int err = semop(dmix->semid, op, 2);
> -	if (err == 0) dmix->locked[sem_num]++;
> +	if (err == 0) {
> +		dmix->locked[sem_num]++;
> +	}
> +	else if (err == -1) {
> +		err = -errno;
> +	}

Just a minor coding style preference:
no need for braces for a single line if/else in general.

	if (err == 0)
		dmix->locked[sem_num]++;
	else if (err == -1)
		err = -errno;


thanks,

Takashi


>  	return err;
>  }
>  
> @@ -271,7 +276,12 @@ static inline int snd_pcm_direct_semaphore_up(snd_pcm_direct_t *dmix, int sem_nu
>  {
>  	struct sembuf op = { sem_num, -1, SEM_UNDO | IPC_NOWAIT };
>  	int err = semop(dmix->semid, &op, 1);
> -	if (err == 0) dmix->locked[sem_num]--;
> +	if (err == 0) {
> +		dmix->locked[sem_num]--;
> +	}
> +	else if (err == -1) {
> +		err = -errno;
> +	}
>  	return err;
>  }
>  
> -- 
> 2.7.4
>