Index: uspace/drv/block/usbmast/scsi_ms.h
===================================================================
--- uspace/drv/block/usbmast/scsi_ms.h	(revision 53b9f2c3825e0a362ac71ad50183265aa5d20115)
+++ uspace/drv/block/usbmast/scsi_ms.h	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
@@ -60,10 +60,10 @@
 } usbmast_inquiry_data_t;
 
-extern int usbmast_inquiry(usbmast_fun_t *, usbmast_inquiry_data_t *);
-extern int usbmast_request_sense(usbmast_fun_t *, void *, size_t);
-extern int usbmast_read_capacity(usbmast_fun_t *, uint32_t *, uint32_t *);
-extern int usbmast_read(usbmast_fun_t *, uint64_t, size_t, void *);
-extern int usbmast_write(usbmast_fun_t *, uint64_t, size_t, const void *);
-extern int usbmast_sync_cache(usbmast_fun_t *, uint64_t, size_t);
+extern errno_t usbmast_inquiry(usbmast_fun_t *, usbmast_inquiry_data_t *);
+extern errno_t usbmast_request_sense(usbmast_fun_t *, void *, size_t);
+extern errno_t usbmast_read_capacity(usbmast_fun_t *, uint32_t *, uint32_t *);
+extern errno_t usbmast_read(usbmast_fun_t *, uint64_t, size_t, void *);
+extern errno_t usbmast_write(usbmast_fun_t *, uint64_t, size_t, const void *);
+extern errno_t usbmast_sync_cache(usbmast_fun_t *, uint64_t, size_t);
 extern const char *usbmast_scsi_dev_type_str(unsigned);