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ALSA: hda - Remove the use of set_fs() 

set_fs() is used in HD-audio vmaster code to retrieve the TLV data of
each slave kctl.  Since the slave is supposed to be a standard amp
kctl, we can call directly the supposed tlv callback instead of the
indirect call, so that we can remove the set_fs() hack.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2017-05-10 12:29:37 +02:00
parent 3db9e970e3
commit 99b5c5bb9a
1 changed files with 31 additions and 28 deletions
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59
sound/pci/hda/hda_codec.c
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@ -1477,6 +1477,30 @@ int snd_hda_mixer_amp_volume_put(struct snd_kcontrol *kcontrol,
}
EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_volume_put);
/* inquiry the amp caps and convert to TLV */
static void get_ctl_amp_tlv(struct snd_kcontrol *kcontrol, unsigned int *tlv)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
hda_nid_t nid = get_amp_nid(kcontrol);
int dir = get_amp_direction(kcontrol);
unsigned int ofs = get_amp_offset(kcontrol);
bool min_mute = get_amp_min_mute(kcontrol);
u32 caps, val1, val2;
caps = query_amp_caps(codec, nid, dir);
val2 = (caps & AC_AMPCAP_STEP_SIZE) >> AC_AMPCAP_STEP_SIZE_SHIFT;
val2 = (val2 + 1) * 25;
val1 = -((caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT);
val1 += ofs;
val1 = ((int)val1) * ((int)val2);
if (min_mute || (caps & AC_AMPCAP_MIN_MUTE))
val2 |= TLV_DB_SCALE_MUTE;
tlv[0] = SNDRV_CTL_TLVT_DB_SCALE;
tlv[1] = 2 * sizeof(unsigned int);
tlv[2] = val1;
tlv[3] = val2;
}
/**
* snd_hda_mixer_amp_volume_put - TLV callback for a standard AMP mixer volume
* @kcontrol: ctl element
@ -1490,30 +1514,12 @@ EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_volume_put);
int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag,
unsigned int size, unsigned int __user *_tlv)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
hda_nid_t nid = get_amp_nid(kcontrol);
int dir = get_amp_direction(kcontrol);
unsigned int ofs = get_amp_offset(kcontrol);
bool min_mute = get_amp_min_mute(kcontrol);
u32 caps, val1, val2;
unsigned int tlv[4];
if (size < 4 * sizeof(unsigned int))
return -ENOMEM;
caps = query_amp_caps(codec, nid, dir);
val2 = (caps & AC_AMPCAP_STEP_SIZE) >> AC_AMPCAP_STEP_SIZE_SHIFT;
val2 = (val2 + 1) * 25;
val1 = -((caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT);
val1 += ofs;
val1 = ((int)val1) * ((int)val2);
if (min_mute || (caps & AC_AMPCAP_MIN_MUTE))
val2 |= TLV_DB_SCALE_MUTE;
if (put_user(SNDRV_CTL_TLVT_DB_SCALE, _tlv))
return -EFAULT;
if (put_user(2 * sizeof(unsigned int), _tlv + 1))
return -EFAULT;
if (put_user(val1, _tlv + 2))
return -EFAULT;
if (put_user(val2, _tlv + 3))
get_ctl_amp_tlv(kcontrol, tlv);
if (copy_to_user(_tlv, tlv, sizeof(tlv)))
return -EFAULT;
return 0;
}
@ -1807,13 +1813,10 @@ static int get_kctl_0dB_offset(struct hda_codec *codec,
const int *tlv = NULL;
int val = -1;
if (kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
/* FIXME: set_fs() hack for obtaining user-space TLV data */
mm_segment_t fs = get_fs();
set_fs(get_ds());
if (!kctl->tlv.c(kctl, 0, sizeof(_tlv), _tlv))
tlv = _tlv;
set_fs(fs);
if ((kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) &&
kctl->tlv.c == snd_hda_mixer_amp_tlv) {
get_ctl_amp_tlv(kctl, _tlv);
tlv = _tlv;
} else if (kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)
tlv = kctl->tlv.p;
if (tlv && tlv[0] == SNDRV_CTL_TLVT_DB_SCALE) {