ext4: do not reference pa_inode from group_pa

pa_inode in group_pa is set NULL in ext4_mb_new_group_pa, so
pa_inode should be not referenced.

Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 748ff7cbe555..319538bf17d2 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -573,9 +573,9 @@ TRACE_EVENT(ext4_mb_release_inode_pa,
 );
 
 TRACE_EVENT(ext4_mb_release_group_pa,
-        TP_PROTO(struct ext4_prealloc_space *pa),
+        TP_PROTO(struct super_block *sb, struct ext4_prealloc_space *pa),
 
-        TP_ARGS(pa),
+        TP_ARGS(sb, pa),
 
         TP_STRUCT__entry(
                 __field(        dev_t,  dev                     )
@@ -585,7 +585,7 @@ TRACE_EVENT(ext4_mb_release_group_pa,
         ),
 
         TP_fast_assign(
-                __entry->dev            = pa->pa_inode->i_sb->s_dev;
+                __entry->dev            = sb->s_dev;
                 __entry->pa_pstart      = pa->pa_pstart;
                 __entry->pa_len         = pa->pa_len;
         ),