ethtool: Add and use ethnl_update_bool.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index deb057c4ea62..b01f7cd542c4 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -138,6 +138,32 @@ static inline void ethnl_update_bool32(u32 *dst, const struct nlattr *attr,
 }
 
 /**
+ * ethnl_update_bool() - updateb bool used as bool from NLA_U8 attribute
+ * @dst:  value to update
+ * @attr: netlink attribute with new value or null
+ * @mod:  pointer to bool for modification tracking
+ *
+ * Use the bool value from NLA_U8 netlink attribute @attr to set bool variable
+ * pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is
+ * null. Bool pointed to by @mod is set to true if this function changed the
+ * logical value of *dst, otherwise it is left as is.
+ */
+static inline void ethnl_update_bool(bool *dst, const struct nlattr *attr,
+				     bool *mod)
+{
+	u8 val;
+
+	if (!attr)
+		return;
+	val = !!nla_get_u8(attr);
+	if (!!*dst == val)
+		return;
+
+	*dst = val;
+	*mod = true;
+}
+
+/**
  * ethnl_update_binary() - update binary data from NLA_BINARY attribute
  * @dst:  value to update
  * @len:  destination buffer length