Merge drm/drm-fixes into drm-misc-fixes

[platform/kernel/linux-rpi.git] / drivers / video / fbdev / core / fb_defio.c

diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index aa5f059..274f5d0 100644 (file)
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -305,17 +305,18 @@ void fb_deferred_io_open(struct fb_info *info,
                         struct inode *inode,
                         struct file *file)
 {
+       struct fb_deferred_io *fbdefio = info->fbdefio;
+
        file->f_mapping->a_ops = &fb_deferred_io_aops;
+       fbdefio->open_count++;
 }
 EXPORT_SYMBOL_GPL(fb_deferred_io_open);
 
-void fb_deferred_io_release(struct fb_info *info)
+static void fb_deferred_io_lastclose(struct fb_info *info)
 {
-       struct fb_deferred_io *fbdefio = info->fbdefio;
        struct page *page;
        int i;
 
-       BUG_ON(!fbdefio);
        cancel_delayed_work_sync(&info->deferred_work);
 
        /* clear out the mapping that we setup */
@@ -324,13 +325,21 @@ void fb_deferred_io_release(struct fb_info *info)
                page->mapping = NULL;
        }
 }
+
+void fb_deferred_io_release(struct fb_info *info)
+{
+       struct fb_deferred_io *fbdefio = info->fbdefio;
+
+       if (!--fbdefio->open_count)
+               fb_deferred_io_lastclose(info);
+}
 EXPORT_SYMBOL_GPL(fb_deferred_io_release);
 
 void fb_deferred_io_cleanup(struct fb_info *info)
 {
        struct fb_deferred_io *fbdefio = info->fbdefio;
 
-       fb_deferred_io_release(info);
+       fb_deferred_io_lastclose(info);
 
        kvfree(info->pagerefs);
        mutex_destroy(&fbdefio->lock);