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of: Refactor node and property manipulation function locking

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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.

Link: https://lore.kernel.org/r/20230801-dt-changeset-fixes-v3-6-5f0410e007dd@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2023-08-18 15:41:01 -05:00
parent 6701c2c76a
commit fab610be30
2 changed files with 49 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/of/base.c
View File

@ -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;
}
@ -1576,18 +1587,10 @@ 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)
@ -1599,14 +1602,24 @@ 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 +1634,13 @@ 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 +1654,9 @@ 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 +1678,10 @@ 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 +1697,13 @@ 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)

51
drivers/of/dynamic.c
View File

@ -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("apply: ", 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;
}