__request_region() sets 'flags' from a given 'parent' to inherit
its attribute. When a target resource has conflict, this function
inserts a resource entry under the conflicted entry by updating
'parent'. In this case, the new resource entry needs to inherit
attribute from the updated parent.
For instance, request_mem_region() calls __request_region() with
'parent' set to &iomem_resource, which is the root entry of the
whole iomem range. When this request results in inserting a new
entry "new" under "DEV-A", "new" needs to inherit from the immediate
parent "DEV-A" as it holds specific attribute for the range.
root (&iomem_resource)
:
+ "DEV-A"
+ "new"
Change __request_region() to set 'flags' and 'desc' of a new entry
from the immediate parent.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
---
kernel/resource.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/kernel/resource.c b/kernel/resource.c
index 4983430..9df79ff 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -1085,15 +1085,16 @@ struct resource * __request_region(struct resource *parent,
res->name = name;
res->start = start;
res->end = start + n - 1;
- res->flags = resource_type(parent) | resource_ext_type(parent);
- res->flags |= IORESOURCE_BUSY | flags;
- res->desc = IORES_DESC_NONE;
write_lock(&resource_lock);
for (;;) {
struct resource *conflict;
+ res->flags = resource_type(parent) | resource_ext_type(parent);
+ res->flags |= IORESOURCE_BUSY | flags;
+ res->desc = parent->desc;
+
conflict = __request_resource(parent, res);
if (!conflict)
break;
--
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