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of: fix race between search and remove in of_update_property()

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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 <Li.Xiubo@freescale.com>
[grant.likely: conflict with another change in same function]
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Xiubo Li 2014-04-17 15:48:29 +08:00 committed by Grant Likely
parent d2d3d7cd81
commit 947fdaad06
1 changed files with 15 additions and 11 deletions
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26
drivers/of/base.c
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@ -1800,7 +1800,7 @@ int of_update_property(struct device_node *np, struct property *newprop)
{
struct property **next, *oldprop;
unsigned long flags;
int rc, found = 0;
int rc;
rc = of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop);
if (rc)
@ -1809,30 +1809,34 @@ 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) {
oldprop = __of_find_property(np, newprop->name, NULL);
if (!oldprop) {
/* add the new node */
rc = __of_add_property(np, newprop);
} else while (*next) {
/* replace the node */
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;
}
raw_spin_unlock_irqrestore(&devtree_lock, flags);
if (!found)
return -ENODEV;
if (rc)
return rc;
/* At early boot, bail out and defer setup to of_init() */
if (!of_kset)
return 0;
/* Update the sysfs attribute */
sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
if (oldprop)
sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
__of_add_property_sysfs(np, newprop);
return 0;