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Subject[PATCH] ALSA: hda: Use correct start/count for sysfs init
Date
The normal flow through the widget sysfs codepath is that
snd_hdac_refresh_widgets() is called once without the sysfs bool set
to set up codec->num_nodes and friends, then another time with the
bool set to actually allocate all the sysfs widgets. However, during
the first time allocation, hda_widget_sysfs_reinit() ignores the new
num_nodes passed in via parameter and just calls hda_widget_sysfs_init(),
using whatever was in codec->num_nodes before the update. This is not
correct in cases where num_nodes changes. Here's an example:

Sometime earlier:
snd_hdac_refresh_widgets(hdac, false)
sets codec->num_nodes to 2, widgets is still not allocated

Now:
snd_hdac_refresh_widgets(hdac, true)
hda_widget_sysfs_reinit(num_nodes=7)
hda_widget_sysfs_init()
widget_tree_create()
alloc(codec->num_nodes) // this is still 2
codec->num_nodes = 7

Pass num_nodes and start_nid down into widget_tree_create() so that
the right number of nodes are allocated in all cases.

Signed-off-by: Evan Green <evgreen@chromium.org>
---

sound/hda/hdac_device.c | 2 +-
sound/hda/hdac_sysfs.c | 14 ++++++++------
sound/hda/local.h | 3 ++-
3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
index 6907dbefd08c..5e74acf45c81 100644
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -144,7 +144,7 @@ int snd_hdac_device_register(struct hdac_device *codec)
if (err < 0)
return err;
mutex_lock(&codec->widget_lock);
- err = hda_widget_sysfs_init(codec);
+ err = hda_widget_sysfs_init(codec, codec->start_nid, codec->num_nodes);
mutex_unlock(&codec->widget_lock);
if (err < 0) {
device_del(&codec->dev);
diff --git a/sound/hda/hdac_sysfs.c b/sound/hda/hdac_sysfs.c
index 909d5ef1179c..1c4b98929d9c 100644
--- a/sound/hda/hdac_sysfs.c
+++ b/sound/hda/hdac_sysfs.c
@@ -358,7 +358,8 @@ static int add_widget_node(struct kobject *parent, hda_nid_t nid,
return 0;
}

-static int widget_tree_create(struct hdac_device *codec)
+static int widget_tree_create(struct hdac_device *codec,
+ hda_nid_t start_nid, int num_nodes)
{
struct hdac_widget_tree *tree;
int i, err;
@@ -372,12 +373,12 @@ static int widget_tree_create(struct hdac_device *codec)
if (!tree->root)
return -ENOMEM;

- tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
+ tree->nodes = kcalloc(num_nodes + 1, sizeof(*tree->nodes),
GFP_KERNEL);
if (!tree->nodes)
return -ENOMEM;

- for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
+ for (i = 0, nid = start_nid; i < num_nodes; i++, nid++) {
err = add_widget_node(tree->root, nid, &widget_node_group,
&tree->nodes[i]);
if (err < 0)
@@ -396,14 +397,15 @@ static int widget_tree_create(struct hdac_device *codec)
}

/* call with codec->widget_lock held */
-int hda_widget_sysfs_init(struct hdac_device *codec)
+int hda_widget_sysfs_init(struct hdac_device *codec,
+ hda_nid_t start_nid, int num_nodes)
{
int err;

if (codec->widgets)
return 0; /* already created */

- err = widget_tree_create(codec);
+ err = widget_tree_create(codec, start_nid, num_nodes);
if (err < 0) {
widget_tree_free(codec);
return err;
@@ -428,7 +430,7 @@ int hda_widget_sysfs_reinit(struct hdac_device *codec,
int i;

if (!codec->widgets)
- return hda_widget_sysfs_init(codec);
+ return hda_widget_sysfs_init(codec, start_nid, num_nodes);

tree = kmemdup(codec->widgets, sizeof(*tree), GFP_KERNEL);
if (!tree)
diff --git a/sound/hda/local.h b/sound/hda/local.h
index 877631e39373..8936120ab4d9 100644
--- a/sound/hda/local.h
+++ b/sound/hda/local.h
@@ -28,7 +28,8 @@ static inline unsigned int get_wcaps_channels(u32 wcaps)
}

extern const struct attribute_group *hdac_dev_attr_groups[];
-int hda_widget_sysfs_init(struct hdac_device *codec);
+int hda_widget_sysfs_init(struct hdac_device *codec,
+ hda_nid_t start_nid, int num_nodes);
int hda_widget_sysfs_reinit(struct hdac_device *codec, hda_nid_t start_nid,
int num_nodes);
void hda_widget_sysfs_exit(struct hdac_device *codec);
--
2.20.1
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