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-rw-r--r--kernel/resource.c51
1 files changed, 24 insertions, 27 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index e3f5680a56..91be1bc50b 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -56,33 +56,17 @@ struct resource_constraint {
static DEFINE_RWLOCK(resource_lock);
-static struct resource *next_resource(struct resource *p)
+static struct resource *next_resource(struct resource *p, bool skip_children)
{
- if (p->child)
+ if (!skip_children && p->child)
return p->child;
while (!p->sibling && p->parent)
p = p->parent;
return p->sibling;
}
-static struct resource *next_resource_skip_children(struct resource *p)
-{
- while (!p->sibling && p->parent)
- p = p->parent;
- return p->sibling;
-}
-
#define for_each_resource(_root, _p, _skip_children) \
- for ((_p) = (_root)->child; (_p); \
- (_p) = (_skip_children) ? next_resource_skip_children(_p) : \
- next_resource(_p))
-
-static void *r_next(struct seq_file *m, void *v, loff_t *pos)
-{
- struct resource *p = v;
- (*pos)++;
- return (void *)next_resource(p);
-}
+ for ((_p) = (_root)->child; (_p); (_p) = next_resource(_p, _skip_children))
#ifdef CONFIG_PROC_FS
@@ -91,14 +75,28 @@ enum { MAX_IORES_LEVEL = 5 };
static void *r_start(struct seq_file *m, loff_t *pos)
__acquires(resource_lock)
{
- struct resource *p = pde_data(file_inode(m->file));
- loff_t l = 0;
+ struct resource *root = pde_data(file_inode(m->file));
+ struct resource *p;
+ loff_t l = *pos;
+
read_lock(&resource_lock);
- for (p = p->child; p && l < *pos; p = r_next(m, p, &l))
- ;
+ for_each_resource(root, p, false) {
+ if (l-- == 0)
+ break;
+ }
+
return p;
}
+static void *r_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct resource *p = v;
+
+ (*pos)++;
+
+ return (void *)next_resource(p, false);
+}
+
static void r_stop(struct seq_file *m, void *v)
__releases(resource_lock)
{
@@ -336,7 +334,7 @@ static int find_next_iomem_res(resource_size_t start, resource_size_t end,
read_lock(&resource_lock);
- for (p = iomem_resource.child; p; p = next_resource(p)) {
+ for_each_resource(&iomem_resource, p, false) {
/* If we passed the resource we are looking for, stop */
if (p->start > end) {
p = NULL;
@@ -1641,13 +1639,12 @@ __setup("reserve=", reserve_setup);
*/
int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
{
- struct resource *p = &iomem_resource;
resource_size_t end = addr + size - 1;
+ struct resource *p;
int err = 0;
- loff_t l;
read_lock(&resource_lock);
- for (p = p->child; p ; p = r_next(NULL, p, &l)) {
+ for_each_resource(&iomem_resource, p, false) {
/*
* We can probably skip the resources without
* IORESOURCE_IO attribute?