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commit 1c388919d89ca35741e9c4d3255adf87f76f0c06
Author: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Sat May 7 20:53:16 2011 +0200
resources: Add lookup_resource()
Add a function to find an existing resource by a resource start address.
This allows to implement simple allocators (with a malloc/free-alike API)
on top of the resource system.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index e9bb22c..63eb429 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -132,6 +132,7 @@ extern int allocate_resource(struct resource *root, struct resource *new,
resource_size_t,
resource_size_t),
void *alignf_data);
+struct resource *lookup_resource(struct resource *root, resource_size_t start);
int adjust_resource(struct resource *res, resource_size_t start,
resource_size_t size);
resource_size_t resource_alignment(struct resource *res);
diff --git a/kernel/resource.c b/kernel/resource.c
index 3ff4017..3b3cedc 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -553,6 +553,27 @@ int allocate_resource(struct resource *root, struct resource *new,
EXPORT_SYMBOL(allocate_resource);
+/**
+ * lookup_resource - find an existing resource by a resource start address
+ * @root: root resource descriptor
+ * @start: resource start address
+ *
+ * Returns a pointer to the resource if found, NULL otherwise
+ */
+struct resource *lookup_resource(struct resource *root, resource_size_t start)
+{
+ struct resource *res;
+
+ read_lock(&resource_lock);
+ for (res = root->child; res; res = res->sibling) {
+ if (res->start == start)
+ break;
+ }
+ read_unlock(&resource_lock);
+
+ return res;
+}
+
/*
* Insert a resource into the resource tree. If successful, return NULL,
* otherwise return the conflicting resource (compare to __request_resource())
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