This is useful for drivers to find a resource inserted by, for example,
an early PCI quirk.
v2: We need to recurse through the resource tree as the named region we
are looking for may be a grandchild of the root node.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
---
include/linux/ioport.h | 2 ++
kernel/resource.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 89b7c24..acad72f 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -158,6 +158,8 @@ extern int allocate_resource(struct resource *root, struct resource *new,
resource_size_t),
void *alignf_data);
struct resource *lookup_resource(struct resource *root, resource_size_t start);
+struct resource *lookup_resource_by_name(struct resource *root,
+ const char *name);
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 3f285dc..c6dd827 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -624,6 +624,36 @@ struct resource *lookup_resource(struct resource *root, resource_size_t start)
return res;
}
+static struct resource *__lookup_resource_by_name(struct resource *res,
+ const char *name)
+{
+ while (res) {
+ struct resource *child;
+
+ if (strcmp(res->name, name) == 0)
+ return res;
+
+ child = __lookup_resource_by_name(res->child, name);
+ if (child)
+ return child;
+
+ res = res->sibling;
+ }
+
+ return NULL;
+}
+
+struct resource *lookup_resource_by_name(struct resource *root, const char *name)
+{
+ struct resource *res;
+
+ read_lock(&resource_lock);
+ res = __lookup_resource_by_name(root->child, name);
+ 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())
--
1.8.3.2
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