tty: fix up usb serial console for termios change.

[karo-tx-linux.git] / fs / ext4 / mmp.c

diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index f99a1311e84765296b0a0a04534e0be0536915bc..fe7c63f4717e09616b92f7d3b4850ab99671cff6 100644 (file)
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -44,6 +44,11 @@ static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)
 {
        struct mmp_struct *mmp = (struct mmp_struct *)(bh->b_data);
 
+       /*
+        * We protect against freezing so that we don't create dirty buffers
+        * on frozen filesystem.
+        */
+       sb_start_write(sb);
        ext4_mmp_csum_set(sb, mmp);
        mark_buffer_dirty(bh);
        lock_buffer(bh);
@@ -51,6 +56,7 @@ static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)
        get_bh(bh);
        submit_bh(WRITE_SYNC, bh);
        wait_on_buffer(bh);
+       sb_end_write(sb);
        if (unlikely(!buffer_uptodate(bh)))
                return 1;