From 02ed594e7113644c06ae3a89bc9215d839510efc Mon Sep 17 00:00:00 2001 From: Xiubo Li Date: Wed, 22 Jan 2014 13:57:40 +0800 Subject: [PATCH] of: fix of_update_property() The of_update_property() is intented to update a property in a node and if the property does not exist, will add it. The second search of the property is possibly won't be found, that maybe removed by other thread just before the second search begain. Using the __of_find_property() and __of_add_property() instead and move them into lock operations. Signed-off-by: Xiubo Li Cc: Pantelis Antoniou Signed-off-by: Grant Likely --- drivers/of/base.c | 36 ++++++++++++++---------------------- 1 file changed, 14 insertions(+), 22 deletions(-) diff --git a/drivers/of/base.c b/drivers/of/base.c index 6ad3dc976b18..239e3da9e728 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1597,7 +1597,7 @@ int of_update_property(struct device_node *np, struct property *newprop) { struct property **next, *oldprop; unsigned long flags; - int rc, found = 0; + int rc = 0; rc = of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop); if (rc) @@ -1606,36 +1606,28 @@ int of_update_property(struct device_node *np, struct property *newprop) if (!newprop->name) return -EINVAL; - oldprop = of_find_property(np, newprop->name, NULL); - if (!oldprop) - return of_add_property(np, newprop); - raw_spin_lock_irqsave(&devtree_lock, flags); - next = &np->properties; - while (*next) { - if (*next == oldprop) { - /* found the node */ - newprop->next = oldprop->next; - *next = newprop; - oldprop->next = np->deadprops; - np->deadprops = oldprop; - found = 1; - break; - } - next = &(*next)->next; + oldprop = __of_find_property(np, newprop->name, NULL); + if (!oldprop) { + /* add the node */ + rc = __of_add_property(np, newprop); + } else { + /* replace the node */ + next = &oldprop; + newprop->next = oldprop->next; + *next = newprop; + oldprop->next = np->deadprops; + np->deadprops = oldprop; } raw_spin_unlock_irqrestore(&devtree_lock, flags); - if (!found) - return -ENODEV; - #ifdef CONFIG_PROC_DEVICETREE /* try to add to proc as well if it was initialized */ - if (np->pde) + if (!rc && np->pde) proc_device_tree_update_prop(np->pde, newprop, oldprop); #endif /* CONFIG_PROC_DEVICETREE */ - return 0; + return rc; } #if defined(CONFIG_OF_DYNAMIC) -- 2.39.5