From 99b5c5bb9a5435a5ae5d46445ac0f2bf6aa5ee52 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 10 May 2017 12:29:37 +0200 Subject: [PATCH] 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 Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_codec.c | 59 ++++++++++++++++++++------------------- 1 file changed, 31 insertions(+), 28 deletions(-) diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 187a9c717fb5..ff9c7968b562 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -1477,18 +1477,8 @@ int snd_hda_mixer_amp_volume_put(struct snd_kcontrol *kcontrol, } EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_volume_put); -/** - * snd_hda_mixer_amp_volume_put - TLV callback for a standard AMP mixer volume - * @kcontrol: ctl element - * @op_flag: operation flag - * @size: byte size of input TLV - * @_tlv: TLV data - * - * The control element is supposed to have the private_value field - * set up via HDA_COMPOSE_AMP_VAL*() or related macros. - */ -int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag, - unsigned int size, unsigned int __user *_tlv) +/* 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); @@ -1497,8 +1487,6 @@ int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag, bool min_mute = get_amp_min_mute(kcontrol); u32 caps, val1, val2; - 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; @@ -1507,13 +1495,31 @@ int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag, 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)) + 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 + * @op_flag: operation flag + * @size: byte size of input TLV + * @_tlv: TLV data + * + * The control element is supposed to have the private_value field + * set up via HDA_COMPOSE_AMP_VAL*() or related macros. + */ +int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag, + unsigned int size, unsigned int __user *_tlv) +{ + unsigned int tlv[4]; + + if (size < 4 * sizeof(unsigned int)) + return -ENOMEM; + 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) { -- GitLab