From: Erez_Zadok <ezk@cs.sunysb.edu>
Date: Tue, 17 Jul 2007 03:40:07 +0000 (-0400)
Subject: Unionfs: debugging: don't oops if sb->s_root is NULL
X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=bc253c73799a41b7a861df2e833ddc7373c89625;p=unionfs-2.6.34.y.git

Unionfs: debugging: don't oops if sb->s_root is NULL

If we're calling show_branch_counts very early during mount or late during
unmount, don't oops if the s_root is already NULL.

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---

diff --git a/fs/unionfs/debug.c b/fs/unionfs/debug.c
index 424c60d650b..94f0e84c0b0 100644
--- a/fs/unionfs/debug.c
+++ b/fs/unionfs/debug.c
@@ -416,7 +416,10 @@ void __show_branch_counts(const struct super_block *sb,
 
 	printk("BC:");
 	for (i=0; i<sbmax(sb); i++) {
-		mnt = UNIONFS_D(sb->s_root)->lower_paths[i].mnt;
+		if (sb->s_root)
+			mnt = UNIONFS_D(sb->s_root)->lower_paths[i].mnt;
+		else
+			mnt = NULL;
 		printk("%d:", (mnt ? atomic_read(&mnt->mnt_count) : -99));
 	}
 	printk("%s:%s:%d\n",file,fxn,line);