Index: uspace/drv/nic/ar9271/ath.h
===================================================================
--- uspace/drv/nic/ar9271/ath.h	(revision 8a64320e304a59746f5987caeba986e6baf11dd7)
+++ uspace/drv/nic/ar9271/ath.h	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
@@ -40,8 +40,8 @@
 /** Atheros wifi operations. */
 typedef struct {
-	int (*send_ctrl_message)(struct ath *, void *, size_t);
-	int (*read_ctrl_message)(struct ath *, void *, size_t, size_t *);
-	int (*send_data_message)(struct ath *, void *, size_t);
-	int (*read_data_message)(struct ath *, void *, size_t, size_t *);
+	errno_t (*send_ctrl_message)(struct ath *, void *, size_t);
+	errno_t (*read_ctrl_message)(struct ath *, void *, size_t, size_t *);
+	errno_t (*send_data_message)(struct ath *, void *, size_t);
+	errno_t (*read_data_message)(struct ath *, void *, size_t, size_t *);
 } ath_ops_t;