linux-kernel - Re: [PATCH] media: pci: cx18: cx18-alsa-mixer.c: Remove some unused functions

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Message-ID: <CA84B402-23C7-4D88-8AB6-DCD5DC3E5529@md.metrocast.net>
Date:	Sat, 20 Dec 2014 20:58:06 -0500
From:	Andy Walls <awalls@...metrocast.net>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
CC:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	ivtv-devel@...vdriver.org, linux-media@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: pci: cx18: cx18-alsa-mixer.c: Remove some unused functions

On December 20, 2014 8:17:05 PM EST, Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> wrote:
>2014-12-21 1:06 GMT+01:00 Andy Walls <awalls@...metrocast.net>:
>> On December 20, 2014 5:35:17 PM EST, Rickard Strandqvist
><rickard_strandqvist@...ctrumdigital.se> wrote:
>>>Removes some functions that are not used anywhere:
>>>snd_cx18_mixer_tv_vol_get() snd_cx18_mixer_tv_vol_info()
>>>snd_cx18_mixer_tv_vol_put()
>>>
>>>This was partially found by using a static code analysis program
>called
>>>cppcheck.
>>>
>>>Signed-off-by: Rickard Strandqvist
>>><rickard_strandqvist@...ctrumdigital.se>
>>>---
>>>drivers/media/pci/cx18/cx18-alsa-mixer.c |   62
>>>------------------------------
>>> 1 file changed, 62 deletions(-)
>>>
>>>diff --git a/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>>b/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>>index 341bddc..e7b0a1f 100644
>>>--- a/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>>+++ b/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>>@@ -69,68 +69,6 @@ static inline int cx18_av_vol_to_dB(int v)
>>>       return (v >> 9) - 119;
>>> }
>>>
>>>-static int snd_cx18_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
>>>-                                    struct snd_ctl_elem_info *uinfo)
>>>-{
>>>-      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
>>>-      uinfo->count = 1;
>>>-      /* We're already translating values, just keep this control in
>dB */
>>>-      uinfo->value.integer.min  = -96;
>>>-      uinfo->value.integer.max  =   8;
>>>-      uinfo->value.integer.step =   1;
>>>-      return 0;
>>>-}
>>>-
>>>-static int snd_cx18_mixer_tv_vol_get(struct snd_kcontrol *kctl,
>>>-                                   struct snd_ctl_elem_value *uctl)
>>>-{
>>>-      struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
>>>-      struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
>>>-      struct v4l2_control vctrl;
>>>-      int ret;
>>>-
>>>-      vctrl.id = V4L2_CID_AUDIO_VOLUME;
>>>-      vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
>>>-
>>>-      snd_cx18_lock(cxsc);
>>>-      ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
>>>-      snd_cx18_unlock(cxsc);
>>>-
>>>-      if (!ret)
>>>-              uctl->value.integer.value[0] =
>cx18_av_vol_to_dB(vctrl.value);
>>>-      return ret;
>>>-}
>>>-
>>>-static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol *kctl,
>>>-                                   struct snd_ctl_elem_value *uctl)
>>>-{
>>>-      struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
>>>-      struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
>>>-      struct v4l2_control vctrl;
>>>-      int ret;
>>>-
>>>-      vctrl.id = V4L2_CID_AUDIO_VOLUME;
>>>-      vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
>>>-
>>>-      snd_cx18_lock(cxsc);
>>>-
>>>-      /* Fetch current state */
>>>-      ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
>>>-
>>>-      if (ret ||
>>>-          (cx18_av_vol_to_dB(vctrl.value) !=
>uctl->value.integer.value[0]))
>>>{
>>>-
>>>-              /* Set, if needed */
>>>-              vctrl.value =
>dB_to_cx18_av_vol(uctl->value.integer.value[0]);
>>>-              ret = v4l2_subdev_call(cx->sd_av, core, s_ctrl,
>&vctrl);
>>>-              if (!ret)
>>>-                      ret = 1; /* Indicate control was changed w/o
>error */
>>>-      }
>>>-      snd_cx18_unlock(cxsc);
>>>-
>>>-      return ret;
>>>-}
>>>-
>>>
>>>/* This is a bit of overkill, the slider is already in dB internally
>*/
>>>static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600,
>100,
>>>0);
>>
>> Really?  Did you try to compile the file after this patch?
>>
>>
>http://git.linuxtv.org/cgit.cgi/media_tree.git/tree/drivers/media/pci/cx18/cx18-alsa-mixer.c#n143
>>
>> They are referenced later in the same file.
>>
>> This is only half a fix.
>>
>>  You can either remove the cx18-alsa-mixer.* files and from the build
>system, or even better,you can hook-up and initialize these callbacks
>with alsa so alsa mixer controls show up for cx18.  :)
>>
>
>
>
>Hi
>
>Ok sorry :-(
>
>Sure, I compile everything as allyesconfig, allmodconfig and
>allnoconfig.
>
>So snd_cx18_mixer_tv_volume_info is the same as
>snd_cx18_mixer_tv_vol_info then.
>
>Would gladly done something a little more concrete.
>But first I want to see if as I can go through all of the
>approximately 2000 functions that are not in use.
>
>
>Kind regards
>Rickard Strandqvist

Yes they are supposed to be the same.  It is dead code with typographical errors. So it is probably not even in the Makefile.

Regards,
Andy
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