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resource: Change __request_region to inherit from immediate parent 

__request_region() sets 'flags' of a new resource from @parent
as it inherits the parent's attribute.  When a target resource
has a conflict, this function inserts the new resource entry
under the conflicted entry by updating @parent.  In this case,
the new resource entry needs to inherit attribute from the updated
parent.  This conflict is a typical case since __request_region()
is used to allocate a new resource from a specific resource range.

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 "DEV-A" under "BUS-1", "DEV-A" needs to inherit from the
immediate parent "BUS-1" as it holds specific attribute for the
range.

root (&iomem_resource)
 :
 + "BUS-1"
    + "DEV-A"

Change __request_region() to set 'flags' and 'desc' of a new entry
from the immediate parent.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Toshi Kani 2016-03-09 12:47:03 -07:00 committed by Dan Williams
parent 45f68802f2
commit 4e0d8f7eff
1 changed files with 4 additions and 3 deletions
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7
kernel/resource.c
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@ -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;