f2fs: add NULL pointer check

[cascardo/linux.git] / fs / f2fs / data.c

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 47a2d7c..cf9ff5f 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -559,6 +559,10 @@ static int f2fs_write_data_pages(struct address_space *mapping,
        int ret;
        long excess_nrtw = 0, desired_nrtw;
 
+       /* deal with chardevs and other special file */
+       if (!mapping->a_ops->writepage)
+               return 0;
+
        if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
                desired_nrtw = MAX_DESIRED_PAGES_WP;
                excess_nrtw = desired_nrtw - wbc->nr_to_write;