[PATCH 1/3] resource: Make __request_region to inherit from immediate parent

__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(a)hpe.com&gt; Cc: Ingo Molnar <mingo(a)kernel.org&gt; Cc: Borislav Petkov <bp(a)suse.de&gt; Cc: Andrew Morton <akpm(a)linux-foundation.org&gt; Cc: Dan Williams <dan.j.williams(a)intel.com&gt; --- 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;