[PATCH v2 1/1] win32u: Allow unsetting the user driver.

[Sven Baars]

From: Sven Baars

The wayland driver does this during initialization.
---
 dlls/win32u/driver.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/driver.c b/dlls/win32u/driver.c
index 12390c026ce..e2ef78f1818 100644
--- a/dlls/win32u/driver.c
+++ b/dlls/win32u/driver.c
@@ -1314,8 +1314,16 @@ void __wine_set_user_driver( const struct user_driver_funcs *funcs, UINT version
         return;
     }

+    if (!funcs)
+    {
+        prev = InterlockedExchangePointer( (void **)&user_driver, (void *)&lazy_load_driver );
+        if (prev != &lazy_load_driver)
+            free( prev );
+        return;
+    }
+
     driver = malloc( sizeof(*driver) );
-    *driver = funcs ? *funcs : null_user_driver;
+    *driver = *funcs;

#define SET_USER_FUNC(name) \
     do { if (!driver->p##name) driver->p##name = nulldrv_##name; } while(0)