lkml.org 
[lkml]   [2016]   [Feb]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/3] resource: Make __request_region to inherit from immediate parent
Date
__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@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>
---
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;
\
 
 \ /
  Last update: 2016-02-02 20:41    [W:0.057 / U:1.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site