ChangeSet 1.2050, 2005/03/09 10:00:20-08:00, [EMAIL PROTECTED]
[PATCH] kref: make kref_put return if this was the last put call.
This is needed for the upcoming klist code from Pat.
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
include/linux/kref.h | 2 +-
lib/kref.c | 11 +++++++++--
2 files changed, 10 insertions(+), 3 deletions(-)
diff -Nru a/include/linux/kref.h b/include/linux/kref.h
--- a/include/linux/kref.h 2005-03-09 16:28:38 -08:00
+++ b/include/linux/kref.h 2005-03-09 16:28:38 -08:00
@@ -26,7 +26,7 @@
void kref_init(struct kref *kref);
void kref_get(struct kref *kref);
-void kref_put(struct kref *kref, void (*release) (struct kref *kref));
+int kref_put(struct kref *kref, void (*release) (struct kref *kref));
#endif /* __KERNEL__ */
#endif /* _KREF_H_ */
diff -Nru a/lib/kref.c b/lib/kref.c
--- a/lib/kref.c 2005-03-09 16:28:38 -08:00
+++ b/lib/kref.c 2005-03-09 16:28:38 -08:00
@@ -42,14 +42,21 @@
* in as this function.
*
* Decrement the refcount, and if 0, call release().
+ * Return 1 if the object was removed, otherwise return 0. Beware, if this
+ * function returns 0, you still can not count on the kref from remaining in
+ * memory. Only use the return value if you want to see if the kref is now
+ * gone, not present.
*/
-void kref_put(struct kref *kref, void (*release) (struct kref *kref))
+int kref_put(struct kref *kref, void (*release)(struct kref *kref))
{
WARN_ON(release == NULL);
WARN_ON(release == (void (*)(struct kref *))kfree);
- if (atomic_dec_and_test(&kref->refcount))
+ if (atomic_dec_and_test(&kref->refcount)) {
release(kref);
+ return 1;
+ }
+ return 0;
}
EXPORT_SYMBOL(kref_init);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
