[PATCH v2 1/3] ALSA: ice1712: remove unneeded return statement

[PATCH v2 1/3] ALSA: ice1712: remove unneeded return statement

[Sudip Mukherjee]

the functions:
        snd_ice1712_akm4xxx_build_controls
        snd_ice1712_build_pro_mixer
        snd_ctl_add
        snd_ak4114_build
        prodigy192_ak4114_init
        snd_ak4113_build
are all returning either 0 or a negetive error value.
so we can easily remove the check for a negative value and return
the value instead.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---

change in v2: returning the return value of the function directly.

 sound/pci/ice1712/hoontech.c   |  6 +-----
 sound/pci/ice1712/ice1712.c    | 19 ++++++-------------
 sound/pci/ice1712/ice1724.c    |  7 ++-----
 sound/pci/ice1712/juli.c       |  5 +----
 sound/pci/ice1712/prodigy192.c |  4 +---
 sound/pci/ice1712/quartet.c    |  5 +----
 6 files changed, 12 insertions(+), 34 deletions(-)

diff --git a/sound/pci/ice1712/hoontech.c b/sound/pci/ice1712/hoontech.c
index 59e37c5..a40001c 100644
--- a/sound/pci/ice1712/hoontech.c
+++ b/sound/pci/ice1712/hoontech.c
@@ -309,11 +309,7 @@ static int snd_ice1712_value_init(struct snd_ice1712 *ice)
 		return err;
 
 	/* ak4524 controls */
-	err = snd_ice1712_akm4xxx_build_controls(ice);
-	if (err < 0)
-		return err;
-
-	return 0;
+	return snd_ice1712_akm4xxx_build_controls(ice);
 }
 
 static int snd_ice1712_ez8_init(struct snd_ice1712 *ice)
diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
index 48a0c33..5975334 100644
--- a/sound/pci/ice1712/ice1712.c
+++ b/sound/pci/ice1712/ice1712.c
@@ -1295,10 +1295,7 @@ static int snd_ice1712_pcm_profi(struct snd_ice1712 *ice, int device, struct snd
 			return err;
 	}
 
-	err = snd_ice1712_build_pro_mixer(ice);
-	if (err < 0)
-		return err;
-	return 0;
+	return snd_ice1712_build_pro_mixer(ice);
 }
 
 /*
@@ -1545,10 +1542,9 @@ static int snd_ice1712_ac97_mixer(struct snd_ice1712 *ice)
 			dev_warn(ice->card->dev,
 				 "cannot initialize ac97 for consumer, skipped\n");
 		else {
-			err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_digmix_route_ac97, ice));
-			if (err < 0)
-				return err;
-			return 0;
+			return snd_ctl_add(ice->card,
+			snd_ctl_new1(&snd_ice1712_mixer_digmix_route_ac97,
+				     ice));
 		}
 	}
 
@@ -2497,11 +2493,8 @@ static int snd_ice1712_build_controls(struct snd_ice1712 *ice)
 	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_pro_volume_rate, ice));
 	if (err < 0)
 		return err;
-	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_pro_peak, ice));
-	if (err < 0)
-		return err;
-
-	return 0;
+	return snd_ctl_add(ice->card,
+			   snd_ctl_new1(&snd_ice1712_mixer_pro_peak, ice));
 }
 
 static int snd_ice1712_free(struct snd_ice1712 *ice)
diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
index f633e3b..ea53167 100644
--- a/sound/pci/ice1712/ice1724.c
+++ b/sound/pci/ice1712/ice1724.c
@@ -2497,11 +2497,8 @@ static int snd_vt1724_build_controls(struct snd_ice1712 *ice)
 			return err;
 	}
 
-	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_vt1724_mixer_pro_peak, ice));
-	if (err < 0)
-		return err;
-
-	return 0;
+	return snd_ctl_add(ice->card,
+			   snd_ctl_new1(&snd_vt1724_mixer_pro_peak, ice));
 }
 
 static int snd_vt1724_free(struct snd_ice1712 *ice)
diff --git a/sound/pci/ice1712/juli.c b/sound/pci/ice1712/juli.c
index 7a6c078..a1536c1 100644
--- a/sound/pci/ice1712/juli.c
+++ b/sound/pci/ice1712/juli.c
@@ -475,11 +475,8 @@ static int juli_add_controls(struct snd_ice1712 *ice)
 		return err;
 
 	/* only capture SPDIF over AK4114 */
-	err = snd_ak4114_build(spec->ak4114, NULL,
+	return snd_ak4114_build(spec->ak4114, NULL,
 			ice->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
-	if (err < 0)
-		return err;
-	return 0;
 }
 
 /*
diff --git a/sound/pci/ice1712/prodigy192.c b/sound/pci/ice1712/prodigy192.c
index 1eb151aa..3919aed 100644
--- a/sound/pci/ice1712/prodigy192.c
+++ b/sound/pci/ice1712/prodigy192.c
@@ -758,10 +758,8 @@ static int prodigy192_init(struct snd_ice1712 *ice)
 			"AK4114 initialized with status %d\n", err);
 	} else
 		dev_dbg(ice->card->dev, "AK4114 not found\n");
-	if (err < 0)
-		return err;
 
-	return 0;
+	return err;
 }
 
 
diff --git a/sound/pci/ice1712/quartet.c b/sound/pci/ice1712/quartet.c
index d4caf9d..6f55e02 100644
--- a/sound/pci/ice1712/quartet.c
+++ b/sound/pci/ice1712/quartet.c
@@ -833,11 +833,8 @@ static int qtet_add_controls(struct snd_ice1712 *ice)
 	if (err < 0)
 		return err;
 	/* only capture SPDIF over AK4113 */
-	err = snd_ak4113_build(spec->ak4113,
+	return snd_ak4113_build(spec->ak4113,
 			ice->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
-	if (err < 0)
-		return err;
-	return 0;
 }
 
 static inline int qtet_is_spdif_master(struct snd_ice1712 *ice)
-- 
1.8.1.2

[PATCH v2 2/3] ALSA: ice1712: consider error value

[Sudip Mukherjee]

earlier we were ignoring the return value of snd_ak4114_create and
always returning 0.
now we are returning the actual status. revo_init is calling this
function, and revo_init is checking the return value.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---
 sound/pci/ice1712/revo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
index 1112ec1..2835196 100644
--- a/sound/pci/ice1712/revo.c
+++ b/sound/pci/ice1712/revo.c
@@ -498,7 +498,7 @@ static int ap192_ak4114_init(struct snd_ice1712 *ice)
 	 * No reason to stop capture stream due to incorrect checks */
 	spec->ak4114->check_flags = AK4114_CHECK_NO_RATE;
 
-	return 0; /* error ignored; it's no fatal error */
+	return err;
 }
 
 static int revo_init(struct snd_ice1712 *ice)
-- 
1.8.1.2

Re: [PATCH v2 2/3] ALSA: ice1712: consider error value

[Takashi Iwai]

At Fri, 14 Nov 2014 16:09:06 +0530,
Sudip Mukherjee wrote:
> 
> earlier we were ignoring the return value of snd_ak4114_create and
> always returning 0.
> now we are returning the actual status. revo_init is calling this
> function, and revo_init is checking the return value.

It's not enough only to change there.  The problem is that
spec->ak4114 is dereferenced after snd_ak4114_create(), and this might
be NULL.  So it should return the error before that point.


Takashi


> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
> ---
>  sound/pci/ice1712/revo.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
> index 1112ec1..2835196 100644
> --- a/sound/pci/ice1712/revo.c
> +++ b/sound/pci/ice1712/revo.c
> @@ -498,7 +498,7 @@ static int ap192_ak4114_init(struct snd_ice1712 *ice)
>  	 * No reason to stop capture stream due to incorrect checks */
>  	spec->ak4114->check_flags = AK4114_CHECK_NO_RATE;
>  
> -	return 0; /* error ignored; it's no fatal error */
> +	return err;
>  }
>  
>  static int revo_init(struct snd_ice1712 *ice)
> -- 
> 1.8.1.2
> 

Re: [PATCH v2 2/3] ALSA: ice1712: consider error value

[Sudip Mukherjee]

On Fri, Nov 14, 2014 at 11:43:31AM +0100, Takashi Iwai wrote:
> At Fri, 14 Nov 2014 16:09:06 +0530,
> Sudip Mukherjee wrote:
> > 
> > earlier we were ignoring the return value of snd_ak4114_create and
> > always returning 0.
> > now we are returning the actual status. revo_init is calling this
> > function, and revo_init is checking the return value.
> 
> It's not enough only to change there.  The problem is that
> spec->ak4114 is dereferenced after snd_ak4114_create(), and this might
> be NULL.  So it should return the error before that point.
> 

oops .. i should have looked carefully.

one more thought:
shouldn't we also do a kfree(spec) on error ?

thanks
sudip

> 
> Takashi
> 
> 
> > Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
> > ---
> >  sound/pci/ice1712/revo.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
> > index 1112ec1..2835196 100644
> > --- a/sound/pci/ice1712/revo.c
> > +++ b/sound/pci/ice1712/revo.c
> > @@ -498,7 +498,7 @@ static int ap192_ak4114_init(struct snd_ice1712 *ice)
> >  	 * No reason to stop capture stream due to incorrect checks */
> >  	spec->ak4114->check_flags = AK4114_CHECK_NO_RATE;
> >  
> > -	return 0; /* error ignored; it's no fatal error */
> > +	return err;
> >  }
> >  
> >  static int revo_init(struct snd_ice1712 *ice)
> > -- 
> > 1.8.1.2
> > 

Re: [PATCH v2 2/3] ALSA: ice1712: consider error value

[Takashi Iwai]

At Fri, 14 Nov 2014 16:29:15 +0530,
Sudip Mukherjee wrote:
> 
> On Fri, Nov 14, 2014 at 11:43:31AM +0100, Takashi Iwai wrote:
> > At Fri, 14 Nov 2014 16:09:06 +0530,
> > Sudip Mukherjee wrote:
> > > 
> > > earlier we were ignoring the return value of snd_ak4114_create and
> > > always returning 0.
> > > now we are returning the actual status. revo_init is calling this
> > > function, and revo_init is checking the return value.
> > 
> > It's not enough only to change there.  The problem is that
> > spec->ak4114 is dereferenced after snd_ak4114_create(), and this might
> > be NULL.  So it should return the error before that point.
> > 
> 
> oops .. i should have looked carefully.
> 
> one more thought:
> shouldn't we also do a kfree(spec) on error ?

Not necessary.  It's freed in the card's destructor.


Takashi

> 
> thanks
> sudip
> 
> > 
> > Takashi
> > 
> > 
> > > Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
> > > ---
> > >  sound/pci/ice1712/revo.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
> > > index 1112ec1..2835196 100644
> > > --- a/sound/pci/ice1712/revo.c
> > > +++ b/sound/pci/ice1712/revo.c
> > > @@ -498,7 +498,7 @@ static int ap192_ak4114_init(struct snd_ice1712 *ice)
> > >  	 * No reason to stop capture stream due to incorrect checks */
> > >  	spec->ak4114->check_flags = AK4114_CHECK_NO_RATE;
> > >  
> > > -	return 0; /* error ignored; it's no fatal error */
> > > +	return err;
> > >  }
> > >  
> > >  static int revo_init(struct snd_ice1712 *ice)
> > > -- 
> > > 1.8.1.2
> > > 
> 

[PATCH v2 3/3] ALSA: ice1712: remove unused variable

[Sudip Mukherjee]

buf_size was initialized with snd_pcm_lib_buffer_bytes,
but never used. and so it is safe to be deleted.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---
 sound/pci/ice1712/ice1712.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
index 5975334..6525191 100644
--- a/sound/pci/ice1712/ice1712.c
+++ b/sound/pci/ice1712/ice1712.c
@@ -620,10 +620,9 @@ static int snd_ice1712_playback_ds_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_ice1712 *ice = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	u32 period_size, buf_size, rate, tmp, chn;
+	u32 period_size, rate, tmp, chn;
 
 	period_size = snd_pcm_lib_period_bytes(substream) - 1;
-	buf_size = snd_pcm_lib_buffer_bytes(substream) - 1;
 	tmp = 0x0064;
 	if (snd_pcm_format_width(runtime->format) == 16)
 		tmp &= ~0x04;
-- 
1.8.1.2

Re: [PATCH v2 3/3] ALSA: ice1712: remove unused variable

[Takashi Iwai]

At Fri, 14 Nov 2014 16:09:07 +0530,
Sudip Mukherjee wrote:
> 
> buf_size was initialized with snd_pcm_lib_buffer_bytes,
> but never used. and so it is safe to be deleted.
> 
> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>

Thanks, applied.


Takashi

> ---
>  sound/pci/ice1712/ice1712.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
> index 5975334..6525191 100644
> --- a/sound/pci/ice1712/ice1712.c
> +++ b/sound/pci/ice1712/ice1712.c
> @@ -620,10 +620,9 @@ static int snd_ice1712_playback_ds_prepare(struct snd_pcm_substream *substream)
>  {
>  	struct snd_ice1712 *ice = snd_pcm_substream_chip(substream);
>  	struct snd_pcm_runtime *runtime = substream->runtime;
> -	u32 period_size, buf_size, rate, tmp, chn;
> +	u32 period_size, rate, tmp, chn;
>  
>  	period_size = snd_pcm_lib_period_bytes(substream) - 1;
> -	buf_size = snd_pcm_lib_buffer_bytes(substream) - 1;
>  	tmp = 0x0064;
>  	if (snd_pcm_format_width(runtime->format) == 16)
>  		tmp &= ~0x04;
> -- 
> 1.8.1.2
> 

Re: [PATCH v2 1/3] ALSA: ice1712: remove unneeded return statement

[Takashi Iwai]

At Fri, 14 Nov 2014 16:09:05 +0530,
Sudip Mukherjee wrote:
> 
> the functions:
>         snd_ice1712_akm4xxx_build_controls
>         snd_ice1712_build_pro_mixer
>         snd_ctl_add
>         snd_ak4114_build
>         prodigy192_ak4114_init
>         snd_ak4113_build
> are all returning either 0 or a negetive error value.
> so we can easily remove the check for a negative value and return
> the value instead.
> 
> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
> ---
> 
> change in v2: returning the return value of the function directly.

Thanks, applied this one.


Takashi

> 
>  sound/pci/ice1712/hoontech.c   |  6 +-----
>  sound/pci/ice1712/ice1712.c    | 19 ++++++-------------
>  sound/pci/ice1712/ice1724.c    |  7 ++-----
>  sound/pci/ice1712/juli.c       |  5 +----
>  sound/pci/ice1712/prodigy192.c |  4 +---
>  sound/pci/ice1712/quartet.c    |  5 +----
>  6 files changed, 12 insertions(+), 34 deletions(-)
> 
> diff --git a/sound/pci/ice1712/hoontech.c b/sound/pci/ice1712/hoontech.c
> index 59e37c5..a40001c 100644
> --- a/sound/pci/ice1712/hoontech.c
> +++ b/sound/pci/ice1712/hoontech.c
> @@ -309,11 +309,7 @@ static int snd_ice1712_value_init(struct snd_ice1712 *ice)
>  		return err;
>  
>  	/* ak4524 controls */
> -	err = snd_ice1712_akm4xxx_build_controls(ice);
> -	if (err < 0)
> -		return err;
> -
> -	return 0;
> +	return snd_ice1712_akm4xxx_build_controls(ice);
>  }
>  
>  static int snd_ice1712_ez8_init(struct snd_ice1712 *ice)
> diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
> index 48a0c33..5975334 100644
> --- a/sound/pci/ice1712/ice1712.c
> +++ b/sound/pci/ice1712/ice1712.c
> @@ -1295,10 +1295,7 @@ static int snd_ice1712_pcm_profi(struct snd_ice1712 *ice, int device, struct snd
>  			return err;
>  	}
>  
> -	err = snd_ice1712_build_pro_mixer(ice);
> -	if (err < 0)
> -		return err;
> -	return 0;
> +	return snd_ice1712_build_pro_mixer(ice);
>  }
>  
>  /*
> @@ -1545,10 +1542,9 @@ static int snd_ice1712_ac97_mixer(struct snd_ice1712 *ice)
>  			dev_warn(ice->card->dev,
>  				 "cannot initialize ac97 for consumer, skipped\n");
>  		else {
> -			err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_digmix_route_ac97, ice));
> -			if (err < 0)
> -				return err;
> -			return 0;
> +			return snd_ctl_add(ice->card,
> +			snd_ctl_new1(&snd_ice1712_mixer_digmix_route_ac97,
> +				     ice));
>  		}
>  	}
>  
> @@ -2497,11 +2493,8 @@ static int snd_ice1712_build_controls(struct snd_ice1712 *ice)
>  	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_pro_volume_rate, ice));
>  	if (err < 0)
>  		return err;
> -	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_pro_peak, ice));
> -	if (err < 0)
> -		return err;
> -
> -	return 0;
> +	return snd_ctl_add(ice->card,
> +			   snd_ctl_new1(&snd_ice1712_mixer_pro_peak, ice));
>  }
>  
>  static int snd_ice1712_free(struct snd_ice1712 *ice)
> diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
> index f633e3b..ea53167 100644
> --- a/sound/pci/ice1712/ice1724.c
> +++ b/sound/pci/ice1712/ice1724.c
> @@ -2497,11 +2497,8 @@ static int snd_vt1724_build_controls(struct snd_ice1712 *ice)
>  			return err;
>  	}
>  
> -	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_vt1724_mixer_pro_peak, ice));
> -	if (err < 0)
> -		return err;
> -
> -	return 0;
> +	return snd_ctl_add(ice->card,
> +			   snd_ctl_new1(&snd_vt1724_mixer_pro_peak, ice));
>  }
>  
>  static int snd_vt1724_free(struct snd_ice1712 *ice)
> diff --git a/sound/pci/ice1712/juli.c b/sound/pci/ice1712/juli.c
> index 7a6c078..a1536c1 100644
> --- a/sound/pci/ice1712/juli.c
> +++ b/sound/pci/ice1712/juli.c
> @@ -475,11 +475,8 @@ static int juli_add_controls(struct snd_ice1712 *ice)
>  		return err;
>  
>  	/* only capture SPDIF over AK4114 */
> -	err = snd_ak4114_build(spec->ak4114, NULL,
> +	return snd_ak4114_build(spec->ak4114, NULL,
>  			ice->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
> -	if (err < 0)
> -		return err;
> -	return 0;
>  }
>  
>  /*
> diff --git a/sound/pci/ice1712/prodigy192.c b/sound/pci/ice1712/prodigy192.c
> index 1eb151aa..3919aed 100644
> --- a/sound/pci/ice1712/prodigy192.c
> +++ b/sound/pci/ice1712/prodigy192.c
> @@ -758,10 +758,8 @@ static int prodigy192_init(struct snd_ice1712 *ice)
>  			"AK4114 initialized with status %d\n", err);
>  	} else
>  		dev_dbg(ice->card->dev, "AK4114 not found\n");
> -	if (err < 0)
> -		return err;
>  
> -	return 0;
> +	return err;
>  }
>  
>  
> diff --git a/sound/pci/ice1712/quartet.c b/sound/pci/ice1712/quartet.c
> index d4caf9d..6f55e02 100644
> --- a/sound/pci/ice1712/quartet.c
> +++ b/sound/pci/ice1712/quartet.c
> @@ -833,11 +833,8 @@ static int qtet_add_controls(struct snd_ice1712 *ice)
>  	if (err < 0)
>  		return err;
>  	/* only capture SPDIF over AK4113 */
> -	err = snd_ak4113_build(spec->ak4113,
> +	return snd_ak4113_build(spec->ak4113,
>  			ice->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
> -	if (err < 0)
> -		return err;
> -	return 0;
>  }
>  
>  static inline int qtet_is_spdif_master(struct snd_ice1712 *ice)
> -- 
> 1.8.1.2
>