resources: add a default alignf to simplify find_resource()

This removes a test from find_resource(), which is getting cluttered.
No functional change.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 13 insertions, 2 deletions

diff --git a/kernel/resource.c b/kernel/resource.c
index 7b36976e5de..7dc8ad24f91 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -357,6 +357,14 @@ int __weak page_is_ram(unsigned long pfn)
         return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;
 }
 
+static resource_size_t simple_align_resource(void *data,
+                                             const struct resource *avail,
+                                             resource_size_t size,
+                                             resource_size_t align)
+{
+        return avail->start;
+}
+
 /*
  * Find empty slot in the resource tree given range and alignment.
  */
@@ -391,8 +399,8 @@ static int find_resource(struct resource *root, struct resource *new,
                 if (tmp.end > max)
                         tmp.end = max;
                 tmp.start = ALIGN(tmp.start, align);
-                if (alignf)
-                        tmp.start = alignf(alignf_data, &tmp, size, align);
+
+                tmp.start = alignf(alignf_data, &tmp, size, align);
                 if (tmp.start < tmp.end && tmp.end - tmp.start >= size - 1) {
                         new->start = tmp.start;
                         new->end = tmp.start + size - 1;
@@ -428,6 +436,9 @@ int allocate_resource(struct resource *root, struct resource *new,
 {
         int err;
 
+        if (!alignf)
+                alignf = simple_align_resource;
+
         write_lock(&resource_lock);
         err = find_resource(root, new, size, min, max, align, alignf, alignf_data);
         if (err >= 0 && __request_resource(root, new))