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From 236c6fa18598ae8b914238bba620cb72320e7c4b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 13 Aug 2009 09:04:10 +0200
Subject: [PATCH] OF: Fixup resursive locking code paths
commit 925df9b36dc9abe0bab32cbd2ac544d773da71ff in tip.
The conversion of devtree_lock from rwlock to spinlock unearthed
recursive locking pathes. Instead of going down the hassle of having
an atomic_rwlock implementation fixup the code pathes to avoid the
recursive locking.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
drivers/of/base.c | 93 ++++++++++++++++++++++++++++++++++++++++------------
1 files changed, 71 insertions(+), 22 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 4e40618..a05713e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -138,16 +138,14 @@ void of_node_put(struct device_node *node)
EXPORT_SYMBOL(of_node_put);
#endif /* !CONFIG_SPARC */
-struct property *of_find_property(const struct device_node *np,
- const char *name,
- int *lenp)
+static struct property *__of_find_property(const struct device_node *np,
+ const char *name, int *lenp)
{
struct property *pp;
if (!np)
return NULL;
- raw_spin_lock(&devtree_lock);
for (pp = np->properties; pp != 0; pp = pp->next) {
if (of_prop_cmp(pp->name, name) == 0) {
if (lenp != 0)
@@ -155,6 +153,18 @@ struct property *of_find_property(const struct device_node *np,
break;
}
}
+
+ return pp;
+}
+
+struct property *of_find_property(const struct device_node *np,
+ const char *name,
+ int *lenp)
+{
+ struct property *pp;
+
+ raw_spin_lock(&devtree_lock);
+ pp = __of_find_property(np, name, lenp);
raw_spin_unlock(&devtree_lock);
return pp;
@@ -188,8 +198,20 @@ EXPORT_SYMBOL(of_find_all_nodes);
* Find a property with a given name for a given node
* and return the value.
*/
+static const void *__of_get_property(const struct device_node *np,
+ const char *name, int *lenp)
+{
+ struct property *pp = __of_find_property(np, name, lenp);
+
+ return pp ? pp->value : NULL;
+}
+
+/*
+ * Find a property with a given name for a given node
+ * and return the value.
+ */
const void *of_get_property(const struct device_node *np, const char *name,
- int *lenp)
+ int *lenp)
{
struct property *pp = of_find_property(np, name, lenp);
@@ -200,13 +222,13 @@ EXPORT_SYMBOL(of_get_property);
/** Checks if the given "compat" string matches one of the strings in
* the device's "compatible" property
*/
-int of_device_is_compatible(const struct device_node *device,
- const char *compat)
+static int __of_device_is_compatible(const struct device_node *device,
+ const char *compat)
{
const char* cp;
- int cplen, l;
+ int uninitialized_var(cplen), l;
- cp = of_get_property(device, "compatible", &cplen);
+ cp = __of_get_property(device, "compatible", &cplen);
if (cp == NULL)
return 0;
while (cplen > 0) {
@@ -219,6 +241,20 @@ int of_device_is_compatible(const struct device_node *device,
return 0;
}
+
+/** Checks if the given "compat" string matches one of the strings in
+ * the device's "compatible" property
+ */
+int of_device_is_compatible(const struct device_node *device,
+ const char *compat)
+{
+ int res;
+
+ raw_spin_lock(&devtree_lock);
+ res = __of_device_is_compatible(device, compat);
+ raw_spin_unlock(&devtree_lock);
+ return res;
+}
EXPORT_SYMBOL(of_device_is_compatible);
/**
@@ -442,7 +478,8 @@ struct device_node *of_find_compatible_node(struct device_node *from,
if (type
&& !(np->type && (of_node_cmp(np->type, type) == 0)))
continue;
- if (of_device_is_compatible(np, compatible) && of_node_get(np))
+ if (__of_device_is_compatible(np, compatible) &&
+ of_node_get(np))
break;
}
of_node_put(from);
@@ -486,15 +523,9 @@ out:
}
EXPORT_SYMBOL(of_find_node_with_property);
-/**
- * of_match_node - Tell if an device_node has a matching of_match structure
- * @matches: array of of device match structures to search in
- * @node: the of device structure to match against
- *
- * Low level utility function used by device matching.
- */
-const struct of_device_id *of_match_node(const struct of_device_id *matches,
- const struct device_node *node)
+static const struct of_device_id *
+__of_match_node(const struct of_device_id *matches,
+ const struct device_node *node)
{
while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
int match = 1;
@@ -505,14 +536,32 @@ const struct of_device_id *of_match_node(const struct of_device_id *matches,
match &= node->type
&& !strcmp(matches->type, node->type);
if (matches->compatible[0])
- match &= of_device_is_compatible(node,
- matches->compatible);
+ match &= __of_device_is_compatible(node,
+ matches->compatible);
if (match)
return matches;
matches++;
}
return NULL;
}
+
+/**
+ * of_match_node - Tell if an device_node has a matching of_match structure
+ * @matches: array of of device match structures to search in
+ * @node: the of device structure to match against
+ *
+ * Low level utility function used by device matching.
+ */
+const struct of_device_id *of_match_node(const struct of_device_id *matches,
+ const struct device_node *node)
+{
+ const struct of_device_id *match;
+
+ raw_spin_lock(&devtree_lock);
+ match = __of_match_node(matches, node);
+ raw_spin_unlock(&devtree_lock);
+ return match;
+}
EXPORT_SYMBOL(of_match_node);
/**
@@ -535,7 +584,7 @@ struct device_node *of_find_matching_node(struct device_node *from,
raw_spin_lock(&devtree_lock);
np = from ? from->allnext : allnodes;
for (; np; np = np->allnext) {
- if (of_match_node(matches, np) && of_node_get(np))
+ if (__of_match_node(matches, np) && of_node_get(np))
break;
}
of_node_put(from);
--
1.7.0.4
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