From 677edc637c76abd45d6d9b1afcb266ce1cfe4dfc Mon Sep 17 00:00:00 2001
From: Stanislav Motylkov <x86corez@gmail.com>
Date: Sun, 20 Jan 2019 19:55:45 +0300
Subject: [PATCH] [WINMM] Load Wave/MIDI mapper drivers only after actual
 device drivers (#1241)

CORE-15620
---
 dll/win32/winmm/registry.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/dll/win32/winmm/registry.c b/dll/win32/winmm/registry.c
index 57f6605b321..563c63f84bb 100644
--- a/dll/win32/winmm/registry.c
+++ b/dll/win32/winmm/registry.c
@@ -32,6 +32,9 @@ BOOL LoadRegistryMMEDrivers(char* key)
     DWORD value_data_length = 256;
     char value_data[256];
 
+    char wavemapper[256] = { 0 };
+    char midimapper[256] = { 0 };
+
     DWORD value_type;
 
     if ( RegOpenKeyA(HKEY_LOCAL_MACHINE, key, &drivers_key) != ERROR_SUCCESS )
@@ -60,14 +63,16 @@ BOOL LoadRegistryMMEDrivers(char* key)
             if ( ! stricmp("wavemapper", value_name) )
             {
                 TRACE("Found a Wave-mapper: %s\n", value_data);
-                valid_driver = TRUE;
+                /* Delay loading Wave mapper driver */
+                strcpy(wavemapper, value_data);
                 is_mapper = TRUE;
                 driver_count ++;
             }
             else if ( ! stricmp("midimapper", value_name) )
             {
                 TRACE("Found a MIDI-mapper: %s\n", value_data);
-                valid_driver = TRUE;
+                /* Delay loading MIDI mapper driver */
+                strcpy(midimapper, value_data);
                 is_mapper = TRUE;
                 driver_count ++;
             }
@@ -125,6 +130,23 @@ BOOL LoadRegistryMMEDrivers(char* key)
         driver_index ++;
     }
 
+    /* Finally load mapper drivers, since they expect device drivers already loaded */
+    if (*wavemapper)
+    {
+        if (!MMDRV_Install("wavemapper", wavemapper, TRUE))
+        {
+            TRACE("FAILED when initializing %s\n", wavemapper);
+        }
+    }
+
+    if (*midimapper)
+    {
+        if (!MMDRV_Install("midimapper", midimapper, TRUE))
+        {
+            TRACE("FAILED when initializing %s\n", midimapper);
+        }
+    }
+
     TRACE("Found a total of %d drivers\n", driver_count);
 
     return driver_count;