video: deferred io cleanup

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.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index e6dafeddfa5be84b9d5bdc406b30a0464748c722..06060ccd3c231b480238d81b98ac2496b69b5e17 100644 (file)
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -202,6 +202,9 @@ void fb_deferred_io_cleanup(struct fb_info *info)
                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);