linux-kernel - Re: [PATCH] ALSA: line6: make snd_pcm

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Date:   Wed, 27 Sep 2017 15:25:48 +0900
From:   Takashi Sakamoto <o-takashi@...amocchi.jp>
To:     Bhumika Goyal <bhumirks@...il.com>, julia.lawall@...6.fr,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: line6: make snd_pcm_ops const

On Sep 27 2017 15:19, Bhumika Goyal wrote:
> Make these const as they are only passed to a const argument of the
> function snd_pcm_set_ops in the file referencing them. Also, add const
> to the declaration in the headers.
> 
> Structures found using Coccinelle and changes done by hand.
> 
> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
> ---
>   sound/usb/line6/capture.c  | 2 +-
>   sound/usb/line6/capture.h  | 2 +-
>   sound/usb/line6/playback.c | 2 +-
>   sound/usb/line6/playback.h | 2 +-
>   4 files changed, 4 insertions(+), 4 deletions(-)

This looks good to me.

Reviewed-by: Takashi Sakamoto <o-takashi@...amocchi.jp>

> diff --git a/sound/usb/line6/capture.c b/sound/usb/line6/capture.c
> index 7c81256..947d616 100644
> --- a/sound/usb/line6/capture.c
> +++ b/sound/usb/line6/capture.c
> @@ -248,7 +248,7 @@ static int snd_line6_capture_close(struct snd_pcm_substream *substream)
>   }
>   
>   /* capture operators */
> -struct snd_pcm_ops snd_line6_capture_ops = {
> +const struct snd_pcm_ops snd_line6_capture_ops = {
>   	.open = snd_line6_capture_open,
>   	.close = snd_line6_capture_close,
>   	.ioctl = snd_pcm_lib_ioctl,
> diff --git a/sound/usb/line6/capture.h b/sound/usb/line6/capture.h
> index 890b21b..b67ccc3 100644
> --- a/sound/usb/line6/capture.h
> +++ b/sound/usb/line6/capture.h
> @@ -17,7 +17,7 @@
>   #include "driver.h"
>   #include "pcm.h"
>   
> -extern struct snd_pcm_ops snd_line6_capture_ops;
> +extern const struct snd_pcm_ops snd_line6_capture_ops;
>   
>   extern void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf,
>   			       int fsize);
> diff --git a/sound/usb/line6/playback.c b/sound/usb/line6/playback.c
> index 812d181..819e9b2 100644
> --- a/sound/usb/line6/playback.c
> +++ b/sound/usb/line6/playback.c
> @@ -393,7 +393,7 @@ static int snd_line6_playback_close(struct snd_pcm_substream *substream)
>   }
>   
>   /* playback operators */
> -struct snd_pcm_ops snd_line6_playback_ops = {
> +const struct snd_pcm_ops snd_line6_playback_ops = {
>   	.open = snd_line6_playback_open,
>   	.close = snd_line6_playback_close,
>   	.ioctl = snd_pcm_lib_ioctl,
> diff --git a/sound/usb/line6/playback.h b/sound/usb/line6/playback.h
> index 51fce29..d8d3b8a 100644
> --- a/sound/usb/line6/playback.h
> +++ b/sound/usb/line6/playback.h
> @@ -27,7 +27,7 @@
>    */
>   #define USE_CLEAR_BUFFER_WORKAROUND 1
>   
> -extern struct snd_pcm_ops snd_line6_playback_ops;
> +extern const struct snd_pcm_ops snd_line6_playback_ops;
>   
>   extern int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm);
>   extern int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm);

Thanks

Takashi Sakamoto