Implement mdio_mutex_nested guard() variant.
guard() comes from the cleanup.h API that defines handy class to
handle the lifecycle of a critical section.
Several drivers use of the mutex_lock_nested()/mutex_unlock() function
call pair hence it is sensible to provide a variant of the generic
guard(mutex), guard(mdio_mutex_nested) so that drivers can be better
supported with the call variant "mutex_lock_nested(..., MDIO_MUTEX_NESTED)"
Example usage:
guard(mutex_lock_nested)(&bus->mdio_lock)
scoped_guard(mutex_lock_nested, &bus->mdio_lock) { ... }
Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
---
include/linux/mdio.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index efeca5bd7600..3f0691dee46a 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -8,6 +8,7 @@
#include <uapi/linux/mdio.h>
#include <linux/bitfield.h>
+#include <linux/mutex.h>
#include <linux/mod_devicetable.h>
struct gpio_desc;
@@ -25,6 +26,9 @@ enum mdio_mutex_lock_class {
MDIO_MUTEX_NESTED,
};
+DEFINE_GUARD(mdio_mutex_nested, struct mutex *,
+ mutex_lock_nested(_T, MDIO_MUTEX_NESTED), mutex_unlock(_T))
+
struct mdio_device {
struct device dev;
--
2.45.2
