[PATCH 02/11] resource: make resource flags handled properly

[Toshi Kani]

I/O resource flags consist of I/O resource types and modifier
bits.  Therefore, checking I/O resource type of the flags must
be performed with a bitwise operation.

Fix find_next_iomem_res() and region_intersects() that simply
compare the flags against a given value.

Also change __request_region() to set res->flags from
resource_type() and resource_ext_type() of the parent, so that
children nodes will inherit the extended I/O resource type.

Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reference: https://lkml.org/lkml/2015/12/3/582
Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
---
 kernel/resource.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index f150dbb..d30a175 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -358,7 +358,7 @@ static int find_next_iomem_res(struct resource *res, char *name,
 	read_lock(&resource_lock);
 
 	for (p = iomem_resource.child; p; p = next_resource(p, sibling_only)) {
-		if (p->flags != res->flags)
+		if ((p->flags & res->flags) != res->flags)
 			continue;
 		if (name && strcmp(p->name, name))
 			continue;
@@ -519,7 +519,8 @@ int region_intersects(resource_size_t start, size_t size, const char *name)
 
 	read_lock(&resource_lock);
 	for (p = iomem_resource.child; p ; p = p->sibling) {
-		bool is_type = strcmp(p->name, name) == 0 && p->flags == flags;
+		bool is_type = strcmp(p->name, name) == 0 &&
+				((p->flags & flags) == flags);
 
 		if (start >= p->start && start <= p->end)
 			is_type ? type++ : other++;
@@ -1071,7 +1072,7 @@ struct resource * __request_region(struct resource *parent,
 	res->name = name;
 	res->start = start;
 	res->end = start + n - 1;
-	res->flags = resource_type(parent);
+	res->flags = resource_type(parent) | resource_ext_type(parent);
 	res->flags |= IORESOURCE_BUSY | flags;
 
 	write_lock(&resource_lock);
--
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