powerpc/vas: Free send window in VAS instance after credits returned

NX may be processing requests while trying to close window. Wait until
all credits are returned and then free send window from VAS instance.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1587017256.2275.1076.camel@hbabu-laptop

diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c
index d0c07cf03f68054eeaec80c490202bb6ba176c37..e15b40596746eb6e7d3be70a4f43f95c5c0e1a9c 100644 (file)
--- a/arch/powerpc/platforms/powernv/vas-window.c
+++ b/arch/powerpc/platforms/powernv/vas-window.c
@@ -1316,14 +1316,14 @@ int vas_win_close(struct vas_window *window)
 
        unmap_paste_region(window);
 
-       clear_vinst_win(window);
-
        poll_window_busy_state(window);
 
        unpin_close_window(window);
 
        poll_window_credits(window);
 
+       clear_vinst_win(window);
+
        poll_window_castout(window);
 
        /* if send window, drop reference to matching receive window */