linux-kernel - [PATCH 05/11] resources: Split out __allocate

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Date:	Tue, 22 May 2012 23:34:31 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 05/11] resources: Split out __allocate_resource()

It will take bool lock, so we could use it in other functions that
hold the resource lock.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 kernel/resource.c |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 51ade23..41d7050 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -521,14 +521,14 @@ out:
  * @alignf: alignment function, optional, called if not NULL
  * @alignf_data: arbitrary data to pass to the @alignf function
  */
-int allocate_resource(struct resource *root, struct resource *new,
+static int __allocate_resource(struct resource *root, struct resource *new,
 		      resource_size_t size, resource_size_t min,
 		      resource_size_t max, resource_size_t align,
 		      resource_size_t (*alignf)(void *,
 						const struct resource *,
 						resource_size_t,
 						resource_size_t),
-		      void *alignf_data)
+		      void *alignf_data, bool lock)
 {
 	int err;
 	struct resource_constraint constraint;
@@ -542,19 +542,35 @@ int allocate_resource(struct resource *root, struct resource *new,
 	constraint.alignf = alignf;
 	constraint.alignf_data = alignf_data;
 
-	if ( new->parent ) {
+	if (new->parent && lock) {
 		/* resource is already allocated, try reallocating with
 		   the new constraints */
 		return reallocate_resource(root, new, size, &constraint);
 	}
 
-	write_lock(&resource_lock);
+	if (lock)
+		write_lock(&resource_lock);
 	err = find_resource(root, new, size, &constraint);
 	if (err >= 0 && __request_resource(root, new))
 		err = -EBUSY;
-	write_unlock(&resource_lock);
+	if (lock)
+		write_unlock(&resource_lock);
 	return err;
 }
+int allocate_resource(struct resource *root, struct resource *new,
+		      resource_size_t size, resource_size_t min,
+		      resource_size_t max, resource_size_t align,
+		      resource_size_t (*alignf)(void *,
+						const struct resource *,
+						resource_size_t,
+						resource_size_t),
+		      void *alignf_data)
+{
+	bool lock = true;
+
+	return __allocate_resource(root, new, size, min, max, align,
+				   alignf, alignf_data, lock);
+}
 
 EXPORT_SYMBOL(allocate_resource);
 
-- 
1.7.7

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