video: deferred io cleanup

From: Magnus Damm <[email protected]>

Make sure the mmap callback is set to NULL in the deferred io cleanup function. This way we can enable and disable deferred io on the fly.

---

 drivers/video/fb_defio.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -202,6 +202,9 @@ void fb_deferred_io_cleanup(struct fb_in
 		page = vmalloc_to_page(screen_base + i);
 		page->mapping = NULL;
 	}
+
+	info->fbops->fb_mmap = NULL;
+	mutex_destroy(&fbdefio->lock);
 }
 EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup);
 

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