Author: hselasky
Date: Mon May 23 12:06:34 2016
New Revision: 300497
URL: https://svnweb.freebsd.org/changeset/base/300497
Log:
Implement "kref_put_mutex()" for the LinuxKPI.
Obtained from: kmacy @
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/linux/kref.h
Modified: head/sys/compat/linuxkpi/common/include/linux/kref.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/kref.h Mon May 23
12:03:40 2016 (r300496)
+++ head/sys/compat/linuxkpi/common/include/linux/kref.h Mon May 23
12:06:34 2016 (r300497)
@@ -36,6 +36,9 @@
#include <sys/refcount.h>
#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+
#include <asm/atomic.h>
struct kref {
@@ -88,4 +91,20 @@ kref_get_unless_zero(struct kref *kref)
return atomic_add_unless(&kref->refcount, 1, 0);
}
+static inline int kref_put_mutex(struct kref *kref,
+ void (*release)(struct kref *kref), struct mutex *lock)
+{
+ WARN_ON(release == NULL);
+ if (unlikely(!atomic_add_unless(&kref->refcount, -1, 1))) {
+ mutex_lock(lock);
+ if (unlikely(!atomic_dec_and_test(&kref->refcount))) {
+ mutex_unlock(lock);
+ return 0;
+ }
+ release(kref);
+ return 1;
+ }
+ return 0;
+}
+
#endif /* _LINUX_KREF_H_ */
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