mirror of https://gitee.com/openkylin/linux.git
ALSA: hda - Fix concurrent hash accesses
The amp and caps hashes aren't protected properly for concurrent accesses. Protect them via a new mutex now. But it can't be so simple as originally thought: since the update of a hash table entry itself might trigger the power-up sequence which again accesses the hash table, we can't cover the whole function simply via mutex. Thus the update part has to be split from the mutex and revalidated. Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
parent
e3245cddcf
commit
c3b6bcc292
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@ -1255,6 +1255,7 @@ int /*__devinit*/ snd_hda_codec_new(struct hda_bus *bus,
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codec->addr = codec_addr;
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mutex_init(&codec->spdif_mutex);
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mutex_init(&codec->control_mutex);
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mutex_init(&codec->hash_mutex);
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init_hda_cache(&codec->amp_cache, sizeof(struct hda_amp_info));
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init_hda_cache(&codec->cmd_cache, sizeof(struct hda_cache_head));
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snd_array_init(&codec->mixers, sizeof(struct hda_nid_item), 32);
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@ -1605,6 +1606,60 @@ get_alloc_amp_hash(struct hda_codec *codec, u32 key)
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return (struct hda_amp_info *)get_alloc_hash(&codec->amp_cache, key);
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}
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/* overwrite the value with the key in the caps hash */
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static int write_caps_hash(struct hda_codec *codec, u32 key, unsigned int val)
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{
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struct hda_amp_info *info;
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mutex_lock(&codec->hash_mutex);
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info = get_alloc_amp_hash(codec, key);
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if (!info) {
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mutex_unlock(&codec->hash_mutex);
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return -EINVAL;
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}
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info->amp_caps = val;
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info->head.val |= INFO_AMP_CAPS;
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mutex_unlock(&codec->hash_mutex);
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return 0;
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}
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/* query the value from the caps hash; if not found, fetch the current
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* value from the given function and store in the hash
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*/
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static unsigned int
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query_caps_hash(struct hda_codec *codec, hda_nid_t nid, int dir, u32 key,
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unsigned int (*func)(struct hda_codec *, hda_nid_t, int))
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{
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struct hda_amp_info *info;
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unsigned int val;
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mutex_lock(&codec->hash_mutex);
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info = get_alloc_amp_hash(codec, key);
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if (!info) {
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mutex_unlock(&codec->hash_mutex);
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return 0;
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}
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if (!(info->head.val & INFO_AMP_CAPS)) {
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mutex_unlock(&codec->hash_mutex); /* for reentrance */
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val = func(codec, nid, dir);
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write_caps_hash(codec, key, val);
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} else {
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val = info->amp_caps;
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mutex_unlock(&codec->hash_mutex);
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}
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return val;
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}
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static unsigned int read_amp_cap(struct hda_codec *codec, hda_nid_t nid,
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int direction)
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{
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if (!(get_wcaps(codec, nid) & AC_WCAP_AMP_OVRD))
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nid = codec->afg;
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return snd_hda_param_read(codec, nid,
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direction == HDA_OUTPUT ?
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AC_PAR_AMP_OUT_CAP : AC_PAR_AMP_IN_CAP);
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}
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/**
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* query_amp_caps - query AMP capabilities
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* @codec: the HD-auio codec
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@ -1619,22 +1674,9 @@ get_alloc_amp_hash(struct hda_codec *codec, u32 key)
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*/
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u32 query_amp_caps(struct hda_codec *codec, hda_nid_t nid, int direction)
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{
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struct hda_amp_info *info;
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info = get_alloc_amp_hash(codec, HDA_HASH_KEY(nid, direction, 0));
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if (!info)
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return 0;
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if (!(info->head.val & INFO_AMP_CAPS)) {
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if (!(get_wcaps(codec, nid) & AC_WCAP_AMP_OVRD))
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nid = codec->afg;
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info->amp_caps = snd_hda_param_read(codec, nid,
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direction == HDA_OUTPUT ?
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AC_PAR_AMP_OUT_CAP :
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AC_PAR_AMP_IN_CAP);
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if (info->amp_caps)
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info->head.val |= INFO_AMP_CAPS;
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}
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return info->amp_caps;
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return query_caps_hash(codec, nid, direction,
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HDA_HASH_KEY(nid, direction, 0),
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read_amp_cap);
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}
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EXPORT_SYMBOL_HDA(query_amp_caps);
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@ -1654,34 +1696,12 @@ EXPORT_SYMBOL_HDA(query_amp_caps);
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int snd_hda_override_amp_caps(struct hda_codec *codec, hda_nid_t nid, int dir,
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unsigned int caps)
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{
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struct hda_amp_info *info;
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info = get_alloc_amp_hash(codec, HDA_HASH_KEY(nid, dir, 0));
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if (!info)
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return -EINVAL;
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info->amp_caps = caps;
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info->head.val |= INFO_AMP_CAPS;
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return 0;
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return write_caps_hash(codec, HDA_HASH_KEY(nid, dir, 0), caps);
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}
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EXPORT_SYMBOL_HDA(snd_hda_override_amp_caps);
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static unsigned int
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query_caps_hash(struct hda_codec *codec, hda_nid_t nid, u32 key,
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unsigned int (*func)(struct hda_codec *, hda_nid_t))
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{
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struct hda_amp_info *info;
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info = get_alloc_amp_hash(codec, key);
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if (!info)
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return 0;
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if (!info->head.val) {
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info->head.val |= INFO_AMP_CAPS;
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info->amp_caps = func(codec, nid);
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}
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return info->amp_caps;
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}
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static unsigned int read_pin_cap(struct hda_codec *codec, hda_nid_t nid)
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static unsigned int read_pin_cap(struct hda_codec *codec, hda_nid_t nid,
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int dir)
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{
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return snd_hda_param_read(codec, nid, AC_PAR_PIN_CAP);
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}
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@ -1699,7 +1719,7 @@ static unsigned int read_pin_cap(struct hda_codec *codec, hda_nid_t nid)
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*/
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u32 snd_hda_query_pin_caps(struct hda_codec *codec, hda_nid_t nid)
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{
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return query_caps_hash(codec, nid, HDA_HASH_PINCAP_KEY(nid),
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return query_caps_hash(codec, nid, 0, HDA_HASH_PINCAP_KEY(nid),
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read_pin_cap);
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}
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EXPORT_SYMBOL_HDA(snd_hda_query_pin_caps);
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@ -1717,41 +1737,47 @@ EXPORT_SYMBOL_HDA(snd_hda_query_pin_caps);
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int snd_hda_override_pin_caps(struct hda_codec *codec, hda_nid_t nid,
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unsigned int caps)
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{
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struct hda_amp_info *info;
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info = get_alloc_amp_hash(codec, HDA_HASH_PINCAP_KEY(nid));
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if (!info)
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return -ENOMEM;
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info->amp_caps = caps;
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info->head.val |= INFO_AMP_CAPS;
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return 0;
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return write_caps_hash(codec, HDA_HASH_PINCAP_KEY(nid), caps);
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}
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EXPORT_SYMBOL_HDA(snd_hda_override_pin_caps);
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/*
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* read the current volume to info
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* if the cache exists, read the cache value.
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/* read or sync the hash value with the current value;
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* call within hash_mutex
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*/
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static unsigned int get_vol_mute(struct hda_codec *codec,
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struct hda_amp_info *info, hda_nid_t nid,
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int ch, int direction, int index)
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static struct hda_amp_info *
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update_amp_hash(struct hda_codec *codec, hda_nid_t nid, int ch,
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int direction, int index)
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{
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u32 val, parm;
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struct hda_amp_info *info;
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unsigned int parm, val = 0;
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bool val_read = false;
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if (info->head.val & INFO_AMP_VOL(ch))
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return info->vol[ch];
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parm = ch ? AC_AMP_GET_RIGHT : AC_AMP_GET_LEFT;
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parm |= direction == HDA_OUTPUT ? AC_AMP_GET_OUTPUT : AC_AMP_GET_INPUT;
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parm |= index;
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val = snd_hda_codec_read(codec, nid, 0,
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retry:
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info = get_alloc_amp_hash(codec, HDA_HASH_KEY(nid, direction, index));
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if (!info)
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return NULL;
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if (!(info->head.val & INFO_AMP_VOL(ch))) {
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if (!val_read) {
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mutex_unlock(&codec->hash_mutex);
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parm = ch ? AC_AMP_GET_RIGHT : AC_AMP_GET_LEFT;
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parm |= direction == HDA_OUTPUT ?
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AC_AMP_GET_OUTPUT : AC_AMP_GET_INPUT;
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parm |= index;
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val = snd_hda_codec_read(codec, nid, 0,
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AC_VERB_GET_AMP_GAIN_MUTE, parm);
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info->vol[ch] = val & 0xff;
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info->head.val |= INFO_AMP_VOL(ch);
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return info->vol[ch];
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val &= 0xff;
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val_read = true;
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mutex_lock(&codec->hash_mutex);
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goto retry;
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}
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info->vol[ch] = val;
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info->head.val |= INFO_AMP_VOL(ch);
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}
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return info;
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}
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/*
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* write the current volume in info to the h/w and update the cache
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* write the current volume in info to the h/w
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*/
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static void put_vol_mute(struct hda_codec *codec, struct hda_amp_info *info,
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hda_nid_t nid, int ch, int direction, int index,
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@ -1768,7 +1794,6 @@ static void put_vol_mute(struct hda_codec *codec, struct hda_amp_info *info,
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else
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parm |= val;
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snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_AMP_GAIN_MUTE, parm);
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info->vol[ch] = val;
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}
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/**
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@ -1785,10 +1810,14 @@ int snd_hda_codec_amp_read(struct hda_codec *codec, hda_nid_t nid, int ch,
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int direction, int index)
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{
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struct hda_amp_info *info;
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info = get_alloc_amp_hash(codec, HDA_HASH_KEY(nid, direction, index));
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if (!info)
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return 0;
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return get_vol_mute(codec, info, nid, ch, direction, index);
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unsigned int val = 0;
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mutex_lock(&codec->hash_mutex);
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info = update_amp_hash(codec, nid, ch, direction, index);
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if (info)
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val = info->vol[ch];
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mutex_unlock(&codec->hash_mutex);
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return val;
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}
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EXPORT_SYMBOL_HDA(snd_hda_codec_amp_read);
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@ -1810,15 +1839,23 @@ int snd_hda_codec_amp_update(struct hda_codec *codec, hda_nid_t nid, int ch,
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{
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struct hda_amp_info *info;
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info = get_alloc_amp_hash(codec, HDA_HASH_KEY(nid, direction, idx));
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if (!info)
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return 0;
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if (snd_BUG_ON(mask & ~0xff))
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mask &= 0xff;
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val &= mask;
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val |= get_vol_mute(codec, info, nid, ch, direction, idx) & ~mask;
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if (info->vol[ch] == val)
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mutex_lock(&codec->hash_mutex);
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info = update_amp_hash(codec, nid, ch, direction, idx);
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if (!info) {
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mutex_unlock(&codec->hash_mutex);
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return 0;
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}
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val |= info->vol[ch] & ~mask;
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if (info->vol[ch] == val) {
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mutex_unlock(&codec->hash_mutex);
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return 0;
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}
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info->vol[ch] = val;
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mutex_unlock(&codec->hash_mutex);
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put_vol_mute(codec, info, nid, ch, direction, idx, val);
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return 1;
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}
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@ -3693,7 +3730,8 @@ unsigned int snd_hda_calc_stream_format(unsigned int rate,
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}
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EXPORT_SYMBOL_HDA(snd_hda_calc_stream_format);
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static unsigned int get_pcm_param(struct hda_codec *codec, hda_nid_t nid)
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static unsigned int get_pcm_param(struct hda_codec *codec, hda_nid_t nid,
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int dir)
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{
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unsigned int val = 0;
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if (nid != codec->afg &&
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@ -3708,11 +3746,12 @@ static unsigned int get_pcm_param(struct hda_codec *codec, hda_nid_t nid)
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static unsigned int query_pcm_param(struct hda_codec *codec, hda_nid_t nid)
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{
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return query_caps_hash(codec, nid, HDA_HASH_PARPCM_KEY(nid),
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return query_caps_hash(codec, nid, 0, HDA_HASH_PARPCM_KEY(nid),
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get_pcm_param);
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}
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static unsigned int get_stream_param(struct hda_codec *codec, hda_nid_t nid)
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static unsigned int get_stream_param(struct hda_codec *codec, hda_nid_t nid,
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int dir)
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{
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unsigned int streams = snd_hda_param_read(codec, nid, AC_PAR_STREAM);
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if (!streams || streams == -1)
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@ -3724,7 +3763,7 @@ static unsigned int get_stream_param(struct hda_codec *codec, hda_nid_t nid)
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static unsigned int query_stream_param(struct hda_codec *codec, hda_nid_t nid)
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{
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return query_caps_hash(codec, nid, HDA_HASH_PARSTR_KEY(nid),
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return query_caps_hash(codec, nid, 0, HDA_HASH_PARSTR_KEY(nid),
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get_stream_param);
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}
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@ -827,6 +827,7 @@ struct hda_codec {
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struct mutex spdif_mutex;
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struct mutex control_mutex;
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struct mutex hash_mutex;
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struct snd_array spdif_out;
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unsigned int spdif_in_enable; /* SPDIF input enable? */
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const hda_nid_t *slave_dig_outs; /* optional digital out slave widgets */
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