[PATCH v3 6/6] of: Refactor node and property manipulation function locking
From: Rob Herring
Date: Fri Aug 18 2023 - 16:47:24 EST
All callers of __of_{add,remove,update}_property() and
__of_{attach,detach}_node() wrap the call with the devtree_lock
spinlock. Let's move the spinlock into the functions. This allows moving
the sysfs update functions into those functions as well.
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
---
v3:
- Rebase due to changes in prior patch
v2:
- Re-arrange exit handling
---
drivers/of/base.c | 65 ++++++++++++++++++++++++++--------------------------
drivers/of/dynamic.c | 51 +++++++++++++----------------------------
2 files changed, 49 insertions(+), 67 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 3f9ddd18ff4b..4b24bed894ad 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1551,21 +1551,32 @@ static struct property *__of_remove_property_from_list(struct property **list, s
*/
int __of_add_property(struct device_node *np, struct property *prop)
{
+ int rc = 0;
+ unsigned long flags;
struct property **next;
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+
__of_remove_property_from_list(&np->deadprops, prop);
prop->next = NULL;
next = &np->properties;
while (*next) {
- if (strcmp(prop->name, (*next)->name) == 0)
+ if (strcmp(prop->name, (*next)->name) == 0) {
/* duplicate ! don't insert it */
- return -EEXIST;
-
+ rc = -EEXIST;
+ goto out_unlock;
+ }
next = &(*next)->next;
}
*next = prop;
+out_unlock:
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ if (rc)
+ return rc;
+
+ __of_add_property_sysfs(np, prop);
return 0;
}
@@ -1576,37 +1587,36 @@ int __of_add_property(struct device_node *np, struct property *prop)
*/
int of_add_property(struct device_node *np, struct property *prop)
{
- unsigned long flags;
int rc;
mutex_lock(&of_mutex);
-
- raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_add_property(np, prop);
- raw_spin_unlock_irqrestore(&devtree_lock, flags);
-
- if (!rc)
- __of_add_property_sysfs(np, prop);
-
mutex_unlock(&of_mutex);
- if (!rc)
- of_property_notify(OF_RECONFIG_ADD_PROPERTY, np, prop, NULL);
-
return rc;
}
EXPORT_SYMBOL_GPL(of_add_property);
int __of_remove_property(struct device_node *np, struct property *prop)
{
+ unsigned long flags;
+ int rc = -ENODEV;
+
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+
if (__of_remove_property_from_list(&np->properties, prop)) {
/* Found the property, add it to deadprops list */
prop->next = np->deadprops;
np->deadprops = prop;
- return 0;
+ rc = 0;
}
- return -ENODEV;
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ if (rc)
+ return rc;
+
+ __of_remove_property_sysfs(np, prop);
+ return 0;
}
/**
@@ -1621,21 +1631,13 @@ int __of_remove_property(struct device_node *np, struct property *prop)
*/
int of_remove_property(struct device_node *np, struct property *prop)
{
- unsigned long flags;
int rc;
if (!prop)
return -ENODEV;
mutex_lock(&of_mutex);
-
- raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_remove_property(np, prop);
- raw_spin_unlock_irqrestore(&devtree_lock, flags);
-
- if (!rc)
- __of_remove_property_sysfs(np, prop);
-
mutex_unlock(&of_mutex);
if (!rc)
@@ -1649,6 +1651,9 @@ int __of_update_property(struct device_node *np, struct property *newprop,
struct property **oldpropp)
{
struct property **next, *oldprop;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&devtree_lock, flags);
__of_remove_property_from_list(&np->deadprops, newprop);
@@ -1670,6 +1675,10 @@ int __of_update_property(struct device_node *np, struct property *newprop,
*next = newprop;
}
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+
+ __of_update_property_sysfs(np, newprop, oldprop);
+
return 0;
}
@@ -1685,21 +1694,13 @@ int __of_update_property(struct device_node *np, struct property *newprop,
int of_update_property(struct device_node *np, struct property *newprop)
{
struct property *oldprop;
- unsigned long flags;
int rc;
if (!newprop->name)
return -EINVAL;
mutex_lock(&of_mutex);
-
- raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_update_property(np, newprop, &oldprop);
- raw_spin_unlock_irqrestore(&devtree_lock, flags);
-
- if (!rc)
- __of_update_property_sysfs(np, newprop, oldprop);
-
mutex_unlock(&of_mutex);
if (!rc)
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index d3ad970ad7b8..9252641de507 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -198,6 +198,9 @@ static void __of_attach_node(struct device_node *np)
{
const __be32 *phandle;
int sz;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&devtree_lock, flags);
if (!of_node_check_flag(np, OF_OVERLAY)) {
np->name = __of_get_property(np, "name", NULL);
@@ -220,6 +223,10 @@ static void __of_attach_node(struct device_node *np)
np->parent->child = np;
of_node_clear_flag(np, OF_DETACHED);
np->fwnode.flags |= FWNODE_FLAG_NOT_DEVICE;
+
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+
+ __of_attach_node_sysfs(np);
}
/**
@@ -229,17 +236,12 @@ static void __of_attach_node(struct device_node *np)
int of_attach_node(struct device_node *np)
{
struct of_reconfig_data rd;
- unsigned long flags;
memset(&rd, 0, sizeof(rd));
rd.dn = np;
mutex_lock(&of_mutex);
- raw_spin_lock_irqsave(&devtree_lock, flags);
__of_attach_node(np);
- raw_spin_unlock_irqrestore(&devtree_lock, flags);
-
- __of_attach_node_sysfs(np);
mutex_unlock(&of_mutex);
of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
@@ -250,13 +252,15 @@ int of_attach_node(struct device_node *np)
void __of_detach_node(struct device_node *np)
{
struct device_node *parent;
+ unsigned long flags;
- if (WARN_ON(of_node_check_flag(np, OF_DETACHED)))
- return;
+ raw_spin_lock_irqsave(&devtree_lock, flags);
parent = np->parent;
- if (WARN_ON(!parent))
+ if (WARN_ON(of_node_check_flag(np, OF_DETACHED) || !parent)) {
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
return;
+ }
if (parent->child == np)
parent->child = np->sibling;
@@ -273,6 +277,10 @@ void __of_detach_node(struct device_node *np)
/* race with of_find_node_by_phandle() prevented by devtree_lock */
__of_phandle_cache_inv_entry(np->phandle);
+
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+
+ __of_detach_node_sysfs(np);
}
/**
@@ -282,17 +290,12 @@ void __of_detach_node(struct device_node *np)
int of_detach_node(struct device_node *np)
{
struct of_reconfig_data rd;
- unsigned long flags;
memset(&rd, 0, sizeof(rd));
rd.dn = np;
mutex_lock(&of_mutex);
- raw_spin_lock_irqsave(&devtree_lock, flags);
__of_detach_node(np);
- raw_spin_unlock_irqrestore(&devtree_lock, flags);
-
- __of_detach_node_sysfs(np);
mutex_unlock(&of_mutex);
of_reconfig_notify(OF_RECONFIG_DETACH_NODE, &rd);
@@ -564,12 +567,10 @@ static int __of_changeset_entry_notify(struct of_changeset_entry *ce,
static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
{
- unsigned long flags;
int ret = 0;
of_changeset_action_debug("applying: ", ce->action, ce->np, ce->prop);
- raw_spin_lock_irqsave(&devtree_lock, flags);
switch (ce->action) {
case OF_RECONFIG_ATTACH_NODE:
__of_attach_node(ce->np);
@@ -590,32 +591,12 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
default:
ret = -EINVAL;
}
- raw_spin_unlock_irqrestore(&devtree_lock, flags);
if (ret) {
of_changeset_action_err("apply failed: ", ce->action, ce->np, ce->prop);
return ret;
}
- switch (ce->action) {
- case OF_RECONFIG_ATTACH_NODE:
- __of_attach_node_sysfs(ce->np);
- break;
- case OF_RECONFIG_DETACH_NODE:
- __of_detach_node_sysfs(ce->np);
- break;
- case OF_RECONFIG_ADD_PROPERTY:
- /* ignore duplicate names */
- __of_add_property_sysfs(ce->np, ce->prop);
- break;
- case OF_RECONFIG_REMOVE_PROPERTY:
- __of_remove_property_sysfs(ce->np, ce->prop);
- break;
- case OF_RECONFIG_UPDATE_PROPERTY:
- __of_update_property_sysfs(ce->np, ce->prop, ce->old_prop);
- break;
- }
-
return 0;
}
--
2.40.1