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Diffstat (limited to 'sound/pci/hda/hda_cs_dsp_ctl.c')
-rw-r--r--sound/pci/hda/hda_cs_dsp_ctl.c47
1 files changed, 31 insertions, 16 deletions
diff --git a/sound/pci/hda/hda_cs_dsp_ctl.c b/sound/pci/hda/hda_cs_dsp_ctl.c
index 463ca06036..9db45d7c17 100644
--- a/sound/pci/hda/hda_cs_dsp_ctl.c
+++ b/sound/pci/hda/hda_cs_dsp_ctl.c
@@ -8,6 +8,7 @@
#include <linux/module.h>
#include <sound/soc.h>
+#include <linux/cleanup.h>
#include <linux/firmware/cirrus/cs_dsp.h>
#include <linux/firmware/cirrus/wmfw.h>
#include "hda_cs_dsp_ctl.h"
@@ -97,11 +98,23 @@ static unsigned int wmfw_convert_flags(unsigned int in)
return out;
}
-static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char *name)
+static void hda_cs_dsp_free_kcontrol(struct snd_kcontrol *kctl)
{
+ struct hda_cs_dsp_coeff_ctl *ctl = (struct hda_cs_dsp_coeff_ctl *)snd_kcontrol_chip(kctl);
struct cs_dsp_coeff_ctl *cs_ctl = ctl->cs_ctl;
+
+ /* NULL priv to prevent a double-free in hda_cs_dsp_control_remove() */
+ cs_ctl->priv = NULL;
+ kfree(ctl);
+}
+
+static void hda_cs_dsp_add_kcontrol(struct cs_dsp_coeff_ctl *cs_ctl,
+ const struct hda_cs_dsp_ctl_info *info,
+ const char *name)
+{
struct snd_kcontrol_new kcontrol = {0};
struct snd_kcontrol *kctl;
+ struct hda_cs_dsp_coeff_ctl *ctl __free(kfree) = NULL;
int ret = 0;
if (cs_ctl->len > ADSP_MAX_STD_CTRL_SIZE) {
@@ -110,6 +123,13 @@ static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char
return;
}
+ ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
+ if (!ctl)
+ return;
+
+ ctl->cs_ctl = cs_ctl;
+ ctl->card = info->card;
+
kcontrol.name = name;
kcontrol.info = hda_cs_dsp_coeff_info;
kcontrol.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
@@ -117,20 +137,22 @@ static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char
kcontrol.get = hda_cs_dsp_coeff_get;
kcontrol.put = hda_cs_dsp_coeff_put;
- /* Save ctl inside private_data, ctl is owned by cs_dsp,
- * and will be freed when cs_dsp removes the control */
kctl = snd_ctl_new1(&kcontrol, (void *)ctl);
if (!kctl)
return;
- ret = snd_ctl_add(ctl->card, kctl);
+ kctl->private_free = hda_cs_dsp_free_kcontrol;
+ ctl->kctl = kctl;
+
+ /* snd_ctl_add() calls our private_free on error, which will kfree(ctl) */
+ cs_ctl->priv = no_free_ptr(ctl);
+ ret = snd_ctl_add(info->card, kctl);
if (ret) {
dev_err(cs_ctl->dsp->dev, "Failed to add KControl %s = %d\n", kcontrol.name, ret);
return;
}
dev_dbg(cs_ctl->dsp->dev, "Added KControl: %s\n", kcontrol.name);
- ctl->kctl = kctl;
}
static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl,
@@ -138,7 +160,6 @@ static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl,
{
struct cs_dsp *cs_dsp = cs_ctl->dsp;
char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
- struct hda_cs_dsp_coeff_ctl *ctl;
const char *region_name;
int ret;
@@ -163,15 +184,7 @@ static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl,
" %.*s", cs_ctl->subname_len - skip, cs_ctl->subname + skip);
}
- ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
- if (!ctl)
- return;
-
- ctl->cs_ctl = cs_ctl;
- ctl->card = info->card;
- cs_ctl->priv = ctl;
-
- hda_cs_dsp_add_kcontrol(ctl, name);
+ hda_cs_dsp_add_kcontrol(cs_ctl, info, name);
}
void hda_cs_dsp_add_controls(struct cs_dsp *dsp, const struct hda_cs_dsp_ctl_info *info)
@@ -203,7 +216,9 @@ void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl)
{
struct hda_cs_dsp_coeff_ctl *ctl = cs_ctl->priv;
- kfree(ctl);
+ /* ctl and kctl may already have been removed by ALSA private_free */
+ if (ctl && ctl->kctl)
+ snd_ctl_remove(ctl->card, ctl->kctl);
}
EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_control_remove, SND_HDA_CS_DSP_CONTROLS);