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authorPatrice Chotard <patrice.chotard@st.com>2013-04-11 13:01:27 +0400
committerLinus Walleij <linus.walleij@linaro.org>2013-04-26 19:01:35 +0400
commit42fed7ba44e4e8c1fb27b28ad14490cb1daff3c7 (patch)
tree3caafd69ed9807e9a15f14d6c482fa1f1a697a8b /drivers/pinctrl/core.c
parentcb6d315dc36ce56bc017051befa9ac9391300eb9 (diff)
downloadlinux-42fed7ba44e4e8c1fb27b28ad14490cb1daff3c7.tar.xz
pinctrl: move subsystem mutex to pinctrl_dev struct
This mutex avoids deadlock in case of use of multiple pin controllers. Before this modification, by using a global mutex, deadlock appeared when, for example, a call to pinctrl_pins_show() locked the pinctrl_mutex, called the ops->pin_dbg_show of a particular pin controller. If this pin controller needs I2C access to retrieve configuration information and I2C driver is using pinctrl to drive its pins, a call to pinctrl_select_state() try to lock again pinctrl_mutex which leads to a deadlock. Notice that the mutex grab from the two direction functions was moved into pinctrl_gpio_direction(). For several cases, we can't replace pinctrl_mutex by pctldev->mutex, because at this stage, pctldev is not accessible : - pinctrl_get()/pinctrl_put() - pinctrl_register_maps() So add respectively pinctrl_list_mutex and pinctrl_maps_mutex in order to protect pinctrl_list and pinctrl_maps list instead. Reintroduce pinctrldev_list_mutex in find_pinctrl_by_of_node(), pinctrl_find_and_add_gpio_range() pinctrl_request_gpio(), pinctrl_free_gpio(), pinctrl_gpio_direction(), pinctrl_devices_show(), pinctrl_register() and pinctrl_unregister() to protect pinctrldev_list. Changes v2->v3: - Fix a missing EXPORT_SYMBOL_GPL() for pinctrl_select_state(). Changes v1->v2: - pinctrl_select_state_locked() is removed, all lock mechanism is located inside pinctrl_select_state(). When parsing the state->setting list, take the per-pin-controller driver lock. (Patrice). - Introduce pinctrldev_list_mutex to protect pinctrldev_list in all functions which parse or modify pictrldev_list. (Patrice). - move find_pinctrl_by_of_node() from pinctrl/devicetree.c to pinctrl/core.c in order to protect pinctrldev_list. (Patrice). - Sink mutex:es into some functions and remove some _locked variants down to where the lists are actually accessed to make things simpler. (Linus) - Drop *all* mutexes completely from pinctrl_lookup_state() and pinctrl_select_state() - no relevant mutex was taken and it was unclear what this was protecting against. (Linus) Reported by : Seraphin Bonnaffe <seraphin.bonnaffe@stericsson.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/core.c')
-rw-r--r--drivers/pinctrl/core.c265
1 files changed, 142 insertions, 123 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 8b832ce6a8e3..c3d222ed39a2 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -40,11 +40,17 @@
static bool pinctrl_dummy_state;
-/* Mutex taken by all entry points */
-DEFINE_MUTEX(pinctrl_mutex);
+/* Mutex taken to protect pinctrl_list */
+DEFINE_MUTEX(pinctrl_list_mutex);
+
+/* Mutex taken to protect pinctrl_maps */
+DEFINE_MUTEX(pinctrl_maps_mutex);
+
+/* Mutex taken to protect pinctrldev_list */
+DEFINE_MUTEX(pinctrldev_list_mutex);
/* Global list of pin control devices (struct pinctrl_dev) */
-LIST_HEAD(pinctrldev_list);
+static LIST_HEAD(pinctrldev_list);
/* List of pin controller handles (struct pinctrl) */
static LIST_HEAD(pinctrl_list);
@@ -111,6 +117,23 @@ struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
return found ? pctldev : NULL;
}
+struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
+{
+ struct pinctrl_dev *pctldev;
+
+ mutex_lock(&pinctrldev_list_mutex);
+
+ list_for_each_entry(pctldev, &pinctrldev_list, node)
+ if (pctldev->dev->of_node == np) {
+ mutex_unlock(&pinctrldev_list_mutex);
+ return pctldev;
+ }
+
+ mutex_lock(&pinctrldev_list_mutex);
+
+ return NULL;
+}
+
/**
* pin_get_from_name() - look up a pin number from a name
* @pctldev: the pin control device to lookup the pin on
@@ -170,9 +193,9 @@ bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
if (pin < 0)
return false;
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pctldev->mutex);
pindesc = pin_desc_get(pctldev, pin);
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
return pindesc != NULL;
}
@@ -269,15 +292,17 @@ pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
{
struct pinctrl_gpio_range *range = NULL;
+ mutex_lock(&pctldev->mutex);
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if (gpio >= range->base &&
gpio < range->base + range->npins) {
+ mutex_unlock(&pctldev->mutex);
return range;
}
}
-
+ mutex_unlock(&pctldev->mutex);
return NULL;
}
@@ -361,9 +386,9 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pctldev->mutex);
list_add_tail(&range->node, &pctldev->gpio_ranges);
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
@@ -381,17 +406,25 @@ EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
struct pinctrl_gpio_range *range)
{
- struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname);
+ struct pinctrl_dev *pctldev;
+
+ mutex_lock(&pinctrldev_list_mutex);
+
+ pctldev = get_pinctrl_dev_from_devname(devname);
/*
* If we can't find this device, let's assume that is because
* it has not probed yet, so the driver trying to register this
* range need to defer probing.
*/
- if (!pctldev)
+ if (!pctldev) {
+ mutex_unlock(&pinctrldev_list_mutex);
return ERR_PTR(-EPROBE_DEFER);
-
+ }
pinctrl_add_gpio_range(pctldev, range);
+
+ mutex_unlock(&pinctrldev_list_mutex);
+
return pctldev;
}
EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
@@ -407,14 +440,17 @@ pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
{
struct pinctrl_gpio_range *range = NULL;
+ mutex_lock(&pctldev->mutex);
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if (pin >= range->pin_base &&
pin < range->pin_base + range->npins) {
+ mutex_unlock(&pctldev->mutex);
return range;
}
}
+ mutex_unlock(&pctldev->mutex);
return NULL;
}
@@ -428,9 +464,9 @@ EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pctldev->mutex);
list_del(&range->node);
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
@@ -481,13 +517,13 @@ int pinctrl_request_gpio(unsigned gpio)
int ret;
int pin;
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pinctrldev_list_mutex);
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
if (pinctrl_ready_for_gpio_range(gpio))
ret = 0;
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
return ret;
}
@@ -496,7 +532,7 @@ int pinctrl_request_gpio(unsigned gpio)
ret = pinmux_request_gpio(pctldev, range, pin, gpio);
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
@@ -516,20 +552,22 @@ void pinctrl_free_gpio(unsigned gpio)
int ret;
int pin;
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pinctrldev_list_mutex);
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
return;
}
+ mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
pinmux_free_gpio(pctldev, pin, range);
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
@@ -540,14 +578,24 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
int ret;
int pin;
+ mutex_lock(&pinctrldev_list_mutex);
+
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
- if (ret)
+ if (ret) {
+ mutex_unlock(&pinctrldev_list_mutex);
return ret;
+ }
+
+ mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
+ ret = pinmux_gpio_direction(pctldev, range, pin, input);
+
+ mutex_unlock(&pctldev->mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
- return pinmux_gpio_direction(pctldev, range, pin, input);
+ return ret;
}
/**
@@ -560,11 +608,7 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
*/
int pinctrl_gpio_direction_input(unsigned gpio)
{
- int ret;
- mutex_lock(&pinctrl_mutex);
- ret = pinctrl_gpio_direction(gpio, true);
- mutex_unlock(&pinctrl_mutex);
- return ret;
+ return pinctrl_gpio_direction(gpio, true);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
@@ -578,11 +622,7 @@ EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
*/
int pinctrl_gpio_direction_output(unsigned gpio)
{
- int ret;
- mutex_lock(&pinctrl_mutex);
- ret = pinctrl_gpio_direction(gpio, false);
- mutex_unlock(&pinctrl_mutex);
- return ret;
+ return pinctrl_gpio_direction(gpio, false);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
@@ -685,14 +725,18 @@ static struct pinctrl *find_pinctrl(struct device *dev)
{
struct pinctrl *p;
+ mutex_lock(&pinctrl_list_mutex);
list_for_each_entry(p, &pinctrl_list, node)
- if (p->dev == dev)
+ if (p->dev == dev) {
+ mutex_unlock(&pinctrl_list_mutex);
return p;
+ }
+ mutex_unlock(&pinctrl_list_mutex);
return NULL;
}
-static void pinctrl_put_locked(struct pinctrl *p, bool inlist);
+static void pinctrl_free(struct pinctrl *p, bool inlist);
static struct pinctrl *create_pinctrl(struct device *dev)
{
@@ -725,6 +769,7 @@ static struct pinctrl *create_pinctrl(struct device *dev)
devname = dev_name(dev);
+ mutex_lock(&pinctrl_maps_mutex);
/* Iterate over the pin control maps to locate the right ones */
for_each_maps(maps_node, i, map) {
/* Map must be for this device */
@@ -746,13 +791,16 @@ static struct pinctrl *create_pinctrl(struct device *dev)
* an -EPROBE_DEFER later, as that is the worst case.
*/
if (ret == -EPROBE_DEFER) {
- pinctrl_put_locked(p, false);
+ pinctrl_free(p, false);
+ mutex_unlock(&pinctrl_maps_mutex);
return ERR_PTR(ret);
}
}
+ mutex_unlock(&pinctrl_maps_mutex);
+
if (ret < 0) {
/* If some other error than deferral occured, return here */
- pinctrl_put_locked(p, false);
+ pinctrl_free(p, false);
return ERR_PTR(ret);
}
@@ -764,7 +812,11 @@ static struct pinctrl *create_pinctrl(struct device *dev)
return p;
}
-static struct pinctrl *pinctrl_get_locked(struct device *dev)
+/**
+ * pinctrl_get() - retrieves the pinctrl handle for a device
+ * @dev: the device to obtain the handle for
+ */
+struct pinctrl *pinctrl_get(struct device *dev)
{
struct pinctrl *p;
@@ -785,21 +837,6 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev)
return create_pinctrl(dev);
}
-
-/**
- * pinctrl_get() - retrieves the pinctrl handle for a device
- * @dev: the device to obtain the handle for
- */
-struct pinctrl *pinctrl_get(struct device *dev)
-{
- struct pinctrl *p;
-
- mutex_lock(&pinctrl_mutex);
- p = pinctrl_get_locked(dev);
- mutex_unlock(&pinctrl_mutex);
-
- return p;
-}
EXPORT_SYMBOL_GPL(pinctrl_get);
static void pinctrl_free_setting(bool disable_setting,
@@ -820,11 +857,12 @@ static void pinctrl_free_setting(bool disable_setting,
}
}
-static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
+static void pinctrl_free(struct pinctrl *p, bool inlist)
{
struct pinctrl_state *state, *n1;
struct pinctrl_setting *setting, *n2;
+ mutex_lock(&pinctrl_list_mutex);
list_for_each_entry_safe(state, n1, &p->states, node) {
list_for_each_entry_safe(setting, n2, &state->settings, node) {
pinctrl_free_setting(state == p->state, setting);
@@ -840,6 +878,7 @@ static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
if (inlist)
list_del(&p->node);
kfree(p);
+ mutex_unlock(&pinctrl_list_mutex);
}
/**
@@ -850,7 +889,7 @@ static void pinctrl_release(struct kref *kref)
{
struct pinctrl *p = container_of(kref, struct pinctrl, users);
- pinctrl_put_locked(p, true);
+ pinctrl_free(p, true);
}
/**
@@ -859,14 +898,17 @@ static void pinctrl_release(struct kref *kref)
*/
void pinctrl_put(struct pinctrl *p)
{
- mutex_lock(&pinctrl_mutex);
kref_put(&p->users, pinctrl_release);
- mutex_unlock(&pinctrl_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_put);
-static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
- const char *name)
+/**
+ * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
+ * @p: the pinctrl handle to retrieve the state from
+ * @name: the state name to retrieve
+ */
+struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
+ const char *name)
{
struct pinctrl_state *state;
@@ -883,26 +925,14 @@ static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
return state;
}
+EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
/**
- * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
- * @p: the pinctrl handle to retrieve the state from
- * @name: the state name to retrieve
+ * pinctrl_select_state() - select/activate/program a pinctrl state to HW
+ * @p: the pinctrl handle for the device that requests configuration
+ * @state: the state handle to select/activate/program
*/
-struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name)
-{
- struct pinctrl_state *s;
-
- mutex_lock(&pinctrl_mutex);
- s = pinctrl_lookup_state_locked(p, name);
- mutex_unlock(&pinctrl_mutex);
-
- return s;
-}
-EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
-
-static int pinctrl_select_state_locked(struct pinctrl *p,
- struct pinctrl_state *state)
+int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
{
struct pinctrl_setting *setting, *setting2;
struct pinctrl_state *old_state = p->state;
@@ -956,8 +986,9 @@ static int pinctrl_select_state_locked(struct pinctrl *p,
break;
}
- if (ret < 0)
+ if (ret < 0) {
goto unapply_new_state;
+ }
}
p->state = state;
@@ -983,23 +1014,7 @@ unapply_new_state:
/* There's no infinite recursive loop here because p->state is NULL */
if (old_state)
- pinctrl_select_state_locked(p, old_state);
-
- return ret;
-}
-
-/**
- * pinctrl_select() - select/activate/program a pinctrl state to HW
- * @p: the pinctrl handle for the device that requests configuratio
- * @state: the state handle to select/activate/program
- */
-int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
-{
- int ret;
-
- mutex_lock(&pinctrl_mutex);
- ret = pinctrl_select_state_locked(p, state);
- mutex_unlock(&pinctrl_mutex);
+ pinctrl_select_state(p, old_state);
return ret;
}
@@ -1129,10 +1144,10 @@ int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
}
if (!locked)
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pinctrl_maps_mutex);
list_add_tail(&maps_node->node, &pinctrl_maps);
if (!locked)
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrl_maps_mutex);
return 0;
}
@@ -1154,12 +1169,15 @@ void pinctrl_unregister_map(struct pinctrl_map const *map)
{
struct pinctrl_maps *maps_node;
+ mutex_lock(&pinctrl_maps_mutex);
list_for_each_entry(maps_node, &pinctrl_maps, node) {
if (maps_node->maps == map) {
list_del(&maps_node->node);
+ mutex_unlock(&pinctrl_maps_mutex);
return;
}
}
+ mutex_unlock(&pinctrl_maps_mutex);
}
/**
@@ -1196,7 +1214,7 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pctldev->mutex);
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
@@ -1218,7 +1236,7 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
seq_puts(s, "\n");
}
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
return 0;
}
@@ -1229,8 +1247,9 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
unsigned ngroups, selector = 0;
+ mutex_lock(&pctldev->mutex);
+
ngroups = ops->get_groups_count(pctldev);
- mutex_lock(&pinctrl_mutex);
seq_puts(s, "registered pin groups:\n");
while (selector < ngroups) {
@@ -1251,7 +1270,7 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
for (i = 0; i < num_pins; i++) {
pname = pin_get_name(pctldev, pins[i]);
if (WARN_ON(!pname)) {
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
return -EINVAL;
}
seq_printf(s, "pin %d (%s)\n", pins[i], pname);
@@ -1261,7 +1280,7 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
selector++;
}
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
return 0;
}
@@ -1273,7 +1292,7 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
seq_puts(s, "GPIO ranges handled:\n");
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pctldev->mutex);
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
@@ -1284,7 +1303,7 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
(range->pin_base + range->npins - 1));
}
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pctldev->mutex);
return 0;
}
@@ -1295,7 +1314,7 @@ static int pinctrl_devices_show(struct seq_file *s, void *what)
seq_puts(s, "name [pinmux] [pinconf]\n");
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
seq_printf(s, "%s ", pctldev->desc->name);
@@ -1310,7 +1329,7 @@ static int pinctrl_devices_show(struct seq_file *s, void *what)
seq_puts(s, "\n");
}
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
return 0;
}
@@ -1339,8 +1358,7 @@ static int pinctrl_maps_show(struct seq_file *s, void *what)
seq_puts(s, "Pinctrl maps:\n");
- mutex_lock(&pinctrl_mutex);
-
+ mutex_lock(&pinctrl_maps_mutex);
for_each_maps(maps_node, i, map) {
seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
map->dev_name, map->name, map_type(map->type),
@@ -1364,8 +1382,7 @@ static int pinctrl_maps_show(struct seq_file *s, void *what)
seq_printf(s, "\n");
}
-
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrl_maps_mutex);
return 0;
}
@@ -1378,7 +1395,7 @@ static int pinctrl_show(struct seq_file *s, void *what)
seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
- mutex_lock(&pinctrl_mutex);
+ mutex_lock(&pinctrl_list_mutex);
list_for_each_entry(p, &pinctrl_list, node) {
seq_printf(s, "device: %s current state: %s\n",
@@ -1410,7 +1427,7 @@ static int pinctrl_show(struct seq_file *s, void *what)
}
}
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrl_list_mutex);
return 0;
}
@@ -1596,6 +1613,7 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
INIT_LIST_HEAD(&pctldev->gpio_ranges);
pctldev->dev = dev;
+ mutex_init(&pctldev->mutex);
/* check core ops for sanity */
if (pinctrl_check_ops(pctldev)) {
@@ -1625,38 +1643,37 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
goto out_err;
}
- mutex_lock(&pinctrl_mutex);
-
+ mutex_lock(&pinctrldev_list_mutex);
list_add_tail(&pctldev->node, &pinctrldev_list);
+ mutex_unlock(&pinctrldev_list_mutex);
+
+ pctldev->p = pinctrl_get(pctldev->dev);
- pctldev->p = pinctrl_get_locked(pctldev->dev);
if (!IS_ERR(pctldev->p)) {
pctldev->hog_default =
- pinctrl_lookup_state_locked(pctldev->p,
- PINCTRL_STATE_DEFAULT);
+ pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
if (IS_ERR(pctldev->hog_default)) {
dev_dbg(dev, "failed to lookup the default state\n");
} else {
- if (pinctrl_select_state_locked(pctldev->p,
+ if (pinctrl_select_state(pctldev->p,
pctldev->hog_default))
dev_err(dev,
"failed to select default state\n");
}
pctldev->hog_sleep =
- pinctrl_lookup_state_locked(pctldev->p,
+ pinctrl_lookup_state(pctldev->p,
PINCTRL_STATE_SLEEP);
if (IS_ERR(pctldev->hog_sleep))
dev_dbg(dev, "failed to lookup the sleep state\n");
}
- mutex_unlock(&pinctrl_mutex);
-
pinctrl_init_device_debugfs(pctldev);
return pctldev;
out_err:
+ mutex_destroy(&pctldev->mutex);
kfree(pctldev);
return NULL;
}
@@ -1674,12 +1691,13 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
if (pctldev == NULL)
return;
- pinctrl_remove_device_debugfs(pctldev);
+ mutex_lock(&pinctrldev_list_mutex);
+ mutex_lock(&pctldev->mutex);
- mutex_lock(&pinctrl_mutex);
+ pinctrl_remove_device_debugfs(pctldev);
if (!IS_ERR(pctldev->p))
- pinctrl_put_locked(pctldev->p, true);
+ pinctrl_put(pctldev->p);
/* TODO: check that no pinmuxes are still active? */
list_del(&pctldev->node);
@@ -1690,9 +1708,10 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
list_del(&range->node);
+ mutex_unlock(&pctldev->mutex);
+ mutex_destroy(&pctldev->mutex);
kfree(pctldev);
-
- mutex_unlock(&pinctrl_mutex);
+ mutex_unlock(&pinctrldev_list_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_unregister);