linux-kernel - [PATCH] kref: add function for reading kref value

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Date:	Mon, 12 Dec 2011 15:41:48 +0200
From:	Daniel Baluta <dbaluta@...acom.com>
To:	greg@...ah.com, linux-kernel@...r.kernel.org
Cc:	marek.belisko@...il.com, Daniel Baluta <dbaluta@...acom.com>
Subject: [PATCH] kref: add function for reading kref value

We can easily get kref refcount value by accesing
kref->refcount but it is better to have a function
for this.

Signed-off-by: Daniel Baluta <dbaluta@...acom.com>
---
 include/linux/kref.h |    1 +
 lib/kref.c           |    9 +++++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/kref.h b/include/linux/kref.h
index d4a62ab..f2e69c1 100644
--- a/include/linux/kref.h
+++ b/include/linux/kref.h
@@ -22,6 +22,7 @@ struct kref {
 };
 
 void kref_init(struct kref *kref);
+int kref_read(struct kref *kref);
 void kref_get(struct kref *kref);
 int kref_put(struct kref *kref, void (*release) (struct kref *kref));
 int kref_sub(struct kref *kref, unsigned int count,
diff --git a/lib/kref.c b/lib/kref.c
index 3efb882..fc7be37 100644
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -26,6 +26,15 @@ void kref_init(struct kref *kref)
 }
 
 /**
+ * kref_read - read refcount for object
+ * @kref: object.
+ */
+int kref_read(struct kref *kref)
+{
+	return atomic_read(&kref->refcount);
+}
+
+/**
  * kref_get - increment refcount for object.
  * @kref: object.
  */
-- 
1.7.1

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