We have two identical copies of resource_contains() already, and more
places that could use it. This moves it to ioport.h where it can be
shared.
resource_contains(struct resource *r1, struct resource *r2) returns true
iff r1 and r2 are the same type (most callers already checked this
separately) and the r1 address range completely contains r2.
In addition, the new resource_contains() checks that both r1 and r2 have
addresses assigned to them. If a resource is IORESOURCE_UNSET, it doesn't
have a valid address and can't contain or be contained by another resource.
Some callers already check this or for res->start.
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/pci/host-bridge.c | 8 --------
include/linux/ioport.h | 10 ++++++++++
kernel/resource.c | 8 ++------
3 files changed, 12 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 06ace6248c61..47aaf22d814e 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c
@@ -32,11 +32,6 @@ void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
bridge->release_data = release_data;
}
-static bool resource_contains(struct resource *res1, struct resource *res2)
-{
- return res1->start <= res2->start && res1->end >= res2->end;
-}
-
void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
struct resource *res)
{
@@ -45,9 +40,6 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
resource_size_t offset = 0;
list_for_each_entry(window, &bridge->windows, list) {
- if (resource_type(res) != resource_type(window->res))
- continue;
-
if (resource_contains(window->res, res)) {
offset = window->offset;
break;
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 89b7c24a36e9..9fcaac8bc4f6 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -169,6 +169,16 @@ static inline unsigned long resource_type(const struct resource *res)
{
return res->flags & IORESOURCE_TYPE_BITS;
}
+/* True iff r1 completely contains r2 */
+static inline bool resource_contains(struct resource *r1, struct resource *r2)
+{
+ if (resource_type(r1) != resource_type(r2))
+ return false;
+ if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
+ return false;
+ return r1->start <= r2->start && r1->end >= r2->end;
+}
+
/* Convenience shorthand with allocation */
#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
diff --git a/kernel/resource.c b/kernel/resource.c
index 3f285dce9347..a8344dda7049 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -432,11 +432,6 @@ static void resource_clip(struct resource *res, resource_size_t min,
res->end = max;
}
-static bool resource_contains(struct resource *res1, struct resource *res2)
-{
- return res1->start <= res2->start && res1->end >= res2->end;
-}
-
/*
* Find empty slot in the resource tree with the given range and
* alignment constraints
@@ -471,10 +466,11 @@ static int __find_resource(struct resource *root, struct resource *old,
arch_remove_reservations(&tmp);
/* Check for overflow after ALIGN() */
- avail = *new;
avail.start = ALIGN(tmp.start, constraint->align);
avail.end = tmp.end;
+ avail.flags = new->flags & ~IORESOURCE_UNSET;
if (avail.start >= tmp.start) {
+ alloc.flags = avail.flags;
alloc.start = constraint->alignf(constraint->alignf_data, &avail,
size, constraint->align);
alloc.end = alloc.start + size - 1;
--
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