Index: uspace/drv/nic/ar9271/ar9271.c
===================================================================
--- uspace/drv/nic/ar9271/ar9271.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/ar9271/ar9271.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -734,5 +734,5 @@
  * @param ar9271 AR9271 device structure
  *
- * @return EOK if succeed, negative error code otherwise
+ * @return EOK if succeed, error code otherwise
  *
  */
@@ -877,5 +877,5 @@
  * @param dev The device structure.
  *
- * @return EOK if succeed, negative error code otherwise
+ * @return EOK if succeed, error code otherwise
  */
 static int ar9271_add_device(ddf_dev_t *dev)
Index: uspace/drv/nic/ar9271/ath_usb.c
===================================================================
--- uspace/drv/nic/ar9271/ath_usb.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/ar9271/ath_usb.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -56,5 +56,5 @@
  * @param usb_device  Connected USB device.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -91,5 +91,5 @@
  * @param buffer_size Buffer size.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -111,5 +111,5 @@
  * @param transferred_size Real size of read data.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -130,5 +130,5 @@
  * @param buffer_size Buffer size.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -166,5 +166,5 @@
  * @param transferred_size Real size of read data.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
Index: uspace/drv/nic/ar9271/htc.c
===================================================================
--- uspace/drv/nic/ar9271/htc.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/ar9271/htc.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -150,5 +150,5 @@
  * @param endpoint_id Destination endpoint.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -173,5 +173,5 @@
  * @param endpoint_id Destination endpoint.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -196,5 +196,5 @@
  * @param transferred_size Real size of read data.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -216,5 +216,5 @@
  * @param transferred_size Real size of read data.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -236,5 +236,5 @@
  *
  * @return EOK if succeed, EINVAL when failed to connect service,
- *         negative error code otherwise.
+ *         error code otherwise.
  *
  */
@@ -309,5 +309,5 @@
  * @param htc_device HTC device structure.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -357,5 +357,5 @@
  * @param htc_device HTC device structure.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -391,5 +391,5 @@
  *
  * @return EOK if succeed, EINVAL if response error,
- *         negative error code otherwise.
+ *         error code otherwise.
  *
  */
@@ -427,5 +427,5 @@
  * @param htc_device HTC device structure to be initialized.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -448,5 +448,5 @@
  * @param htc_device HTC device structure.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
Index: uspace/drv/nic/ar9271/hw.c
===================================================================
--- uspace/drv/nic/ar9271/hw.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/ar9271/hw.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -49,5 +49,5 @@
  *
  * @return EOK if succeed, ETIMEOUT on timeout,
- *         negative error code otherwise.
+ *         error code otherwise.
  *
  */
@@ -215,5 +215,5 @@
  * @param ar9271 Device structure.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -636,5 +636,5 @@
  * @param ar9271 Device structure.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  */
 int hw_init(ar9271_t *ar9271)
Index: uspace/drv/nic/ar9271/wmi.c
===================================================================
--- uspace/drv/nic/ar9271/wmi.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/ar9271/wmi.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -47,5 +47,5 @@
  * @param res        Stored result.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -79,5 +79,5 @@
  * @param val        Value to be written
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -112,5 +112,5 @@
  * @param clear_bit  Bit to be cleared.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -146,5 +146,5 @@
  * @param set_bit    Bit to be set.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -161,5 +161,5 @@
  * @param clear_bit  Bit to be cleared.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -176,5 +176,5 @@
  * @param elements   Number of elements in array.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
@@ -220,5 +220,5 @@
  * @param response_buffer Buffer with response data.
  *
- * @return EOK if succeed, negative error code otherwise.
+ * @return EOK if succeed, error code otherwise.
  *
  */
Index: uspace/drv/nic/e1k/e1k.c
===================================================================
--- uspace/drv/nic/e1k/e1k.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/e1k/e1k.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -1261,5 +1261,5 @@
  * @param[out] handle  IRQ capability handle if the handler was registered
  *
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -1370,5 +1370,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -1524,5 +1524,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -1940,5 +1940,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -1965,5 +1965,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -1993,5 +1993,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -2107,5 +2107,5 @@
  *
  * @return EOK if successed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -2255,5 +2255,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  *
  */
@@ -2289,5 +2289,5 @@
  *
  * @return EOK if succeed
- * @return Negative error code otherwise
+ * @return An error code otherwise
  */
 static int e1000_set_addr(ddf_fun_t *fun, const nic_address_t *addr)
Index: uspace/drv/nic/rtl8139/driver.c
===================================================================
--- uspace/drv/nic/rtl8139/driver.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/rtl8139/driver.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -217,5 +217,5 @@
  *  @param address  The place to store the address
  *
- *  @return EOK if succeed, negative error code otherwise
+ *  @return EOK if succeed, error code otherwise
  */
 inline static void rtl8139_hw_get_addr(rtl8139_t *rtl8139,
@@ -844,5 +844,5 @@
  *  @param[out] handle  IRQ capability handle if the handler was registered.
  *
- *  @return Negative error code otherwise.
+ *  @return An error code otherwise.
  */
 inline static int rtl8139_register_int_handler(nic_t *nic_data, cap_handle_t *handle)
@@ -1025,5 +1025,5 @@
  *  @param hw_resources  Devices hardware resources
  *
- *  @return EOK if succeed, negative error code otherwise
+ *  @return EOK if succeed, error code otherwise
  */
 static int rtl8139_fill_resource_info(ddf_dev_t *dev, const hw_res_list_parsed_t
@@ -1065,5 +1065,5 @@
  *  @param dev  The device structure
  *
- *  @return EOK if succeed, negative error code otherwise
+ *  @return EOK if succeed, error code otherwise
  */
 static int rtl8139_get_resource_info(ddf_dev_t *dev)
@@ -1147,5 +1147,5 @@
  *  @param dev  The device information
  *
- *  @return EOK if succeed, negative error code otherwise
+ *  @return EOK if succeed, error code otherwise
  */
 static int rtl8139_device_initialize(ddf_dev_t *dev)
@@ -1206,5 +1206,5 @@
  * @param dev  The RTL8139 device.
  *
- * @return EOK if successed, negative error code otherwise
+ * @return EOK if successed, error code otherwise
  */
 static int rtl8139_pio_enable(ddf_dev_t *dev)
@@ -1256,5 +1256,5 @@
  * @param dev  The RTL8139 device.
  *
- * @return EOK if added successfully, negative error code otherwise
+ * @return EOK if added successfully, error code otherwise
  */
 int rtl8139_dev_add(ddf_dev_t *dev)
@@ -1339,5 +1339,5 @@
  *  @param max_len  Maximal addresss length to store
  *
- *  @return EOK if succeed, negative error code otherwise
+ *  @return EOK if succeed, error code otherwise
  */
 static int rtl8139_set_addr(ddf_fun_t *fun, const nic_address_t *addr)
Index: uspace/drv/nic/rtl8139/general.c
===================================================================
--- uspace/drv/nic/rtl8139/general.c	(revision dd8ab1cacb307cb1ac01aa4918c789d13e112e56)
+++ uspace/drv/nic/rtl8139/general.c	(revision 3d95c9d298f9fdd9a38e39d934b2aaea1c837cee)
@@ -81,5 +81,5 @@
  *  @param time        The requested time
  *
- *  @return EOK if succeed, negative error code otherwise
+ *  @return EOK if succeed, error code otherwise
  */
 int rtl8139_timer_act_init(rtl8139_timer_act_t * ta, uint32_t timer_freq,