diff options
author | Ingo Molnar <mingo@elte.hu> | 2011-08-05 10:32:54 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2011-08-05 10:33:55 +0200 |
commit | 3272cab4063467410802367a8d69f06c65b2a866 (patch) | |
tree | 1c665f8572b0aab2a5343d32b5eaa6713669b04f /kernel/resource.c | |
parent | f629299b544b6cc12b4e3e85fec96f4ce5809482 (diff) | |
parent | 140d0b2108faebc77c6523296e211e509cb9f5f9 (diff) |
Merge branch 'linus' into perf/urgent
Merge reason: Include most of the merge window trees, to do fixes on top.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/resource.c')
-rw-r--r-- | kernel/resource.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 3ff40178dce7..3b3cedc52592 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()) |