This is useful for drivers to find a resource inserted by, for example,
an early PCI quirk.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
include/linux/ioport.h | 2 ++
kernel/resource.c | 14 ++++++++++++++
2 files changed, 16 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..9cc1bb8 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -624,6 +624,20 @@ struct resource *lookup_resource(struct resource *root, resource_size_t start)
return res;
}
+struct resource *lookup_resource_by_name(struct resource *root, const char *name)
+{
+ struct resource *res;
+
+ read_lock(&resource_lock);
+ for (res = root->child; res; res = res->sibling) {
+ if (strcmp(res->name, name) == 0)
+ 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())
--
1.8.3.2
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