[PATCH v2 09/12] video/vesa: unmap frame buffer when relinquishing console

[Jan Beulich <jbeulich@xxxxxxxx>]

There's no point in keeping the VA space occupied when no further output
will occur.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/drivers/video/lfb.c
+++ b/xen/drivers/video/lfb.c
@@ -168,4 +168,5 @@ void lfb_free(void)
     xfree(lfb.lbuf);
     xfree(lfb.text_buf);
     xfree(lfb.line_len);
+    lfb.lfbp.lfb = ZERO_BLOCK_PTR;
 }
--- a/xen/drivers/video/vesa.c
+++ b/xen/drivers/video/vesa.c
@@ -197,5 +197,7 @@ void __init vesa_endboot(bool_t keep)
                    vlfb_info.width * bpp);
         lfb_flush();
         lfb_free();
+        iounmap(lfb);
+        lfb = ZERO_BLOCK_PTR;
     }
 }