lkml.org 
[lkml]   [2011]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] [209/275] SUNRPC: Ensure we always run the tk_callback before tk_action
Date
2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Trond Myklebust <Trond.Myklebust@netapp.com>

commit e020c6800c9621a77223bf2c1ff68180e41e8ebf upstream.

This fixes a race in which the task->tk_callback() puts the rpc_task
to sleep, setting a new callback. Under certain circumstances, the current
code may end up executing the task->tk_action before it gets round to the
callback.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
net/sunrpc/sched.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

Index: linux-2.6.35.y/net/sunrpc/sched.c
===================================================================
--- linux-2.6.35.y.orig/net/sunrpc/sched.c 2011-03-29 22:50:35.157358829 -0700
+++ linux-2.6.35.y/net/sunrpc/sched.c 2011-03-29 23:03:02.613233304 -0700
@@ -637,14 +637,12 @@
save_callback = task->tk_callback;
task->tk_callback = NULL;
save_callback(task);
- }
-
- /*
- * Perform the next FSM step.
- * tk_action may be NULL when the task has been killed
- * by someone else.
- */
- if (!RPC_IS_QUEUED(task)) {
+ } else {
+ /*
+ * Perform the next FSM step.
+ * tk_action may be NULL when the task has been killed
+ * by someone else.
+ */
if (task->tk_action == NULL)
break;
task->tk_action(task);

\
 
 \ /
  Last update: 2011-03-30 23:25    [W:1.010 / U:1.016 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site