fs/super.c: fix race between freeze_super() and thaw_super()

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / super.c

diff --git a/fs/super.c b/fs/super.c
index 97280e76179c5f5dd79d109a527e23103c62b1b6..fd3281d1ec45f749bfbc83ca684e321b2905dd38 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -1327,8 +1327,8 @@ int freeze_super(struct super_block *sb)
                }
        }
        /*
-        * This is just for debugging purposes so that fs can warn if it
-        * sees write activity when frozen is set to SB_FREEZE_COMPLETE.
+        * For debugging purposes so that fs can warn if it sees write activity
+        * when frozen is set to SB_FREEZE_COMPLETE, and for thaw_super().
         */
        sb->s_writers.frozen = SB_FREEZE_COMPLETE;
        up_write(&sb->s_umount);
@@ -1347,7 +1347,7 @@ int thaw_super(struct super_block *sb)
        int error;
 
        down_write(&sb->s_umount);
-       if (sb->s_writers.frozen == SB_UNFROZEN) {
+       if (sb->s_writers.frozen != SB_FREEZE_COMPLETE) {
                up_write(&sb->s_umount);
                return -EINVAL;
        }