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Description of problem:
nfs_readpage_release() causes an oops while accessing a file with NFS
debugging turned on (echo 32767 > /proc/sys/sunrpc/nfs_debug) and a kernel
built with CONFIG_DEBUG_SLAB.


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. echo 32767 > /proc/sys/sunrpc/nfs_debug
2. read a file from an NFS filesystem
3.
  

Actual Results:  the system oops

Expected Results:  The read shold work

Additional info:

The upstream patch:
This patch moves the debugging statement above nfs_release_request() to
avoid accessing freed memory.

Signed-off-by: Nick Wilson <njw>
Cc: Trond Myklebust <trond.myklebust.no>
Signed-off-by: Andrew Morton <akpm>
Signed-off-by: Linus Torvalds <torvalds>

 fs/nfs/read.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -184,14 +184,13 @@ static void nfs_readpage_release(struct
 {
     unlock_page(req->wb_page);

-    nfs_clear_request(req);
-    nfs_release_request(req);
-
     dprintk("NFS: read done (%s/%Ld %d@%Ld)\n",
             req->wb_context->dentry->d_inode->i_sb->s_id,
             (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
             req->wb_bytes,
             (long long)req_offset(req));
+    nfs_clear_request(req);
+    nfs_release_request(req);
 }

 /*