svcrpc: don't hold sv_lock over svc_xprt_put()
authorJ. Bruce Fields <bfields@citi.umich.edu>
Tue, 30 Mar 2010 01:02:31 +0000 (21:02 -0400)
committerJ. Bruce Fields <bfields@citi.umich.edu>
Tue, 30 Mar 2010 01:02:31 +0000 (21:02 -0400)
svc_xprt_put() can call tcp_close(), which can sleep, so we shouldn't be
holding this lock.

In fact, only the xpt_list removal and the sv_tmpcnt decrement should
need the sv_lock here.

Reported-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
net/sunrpc/svc_xprt.c

index 8f0f1fb..c334f54 100644 (file)
@@ -892,12 +892,12 @@ void svc_delete_xprt(struct svc_xprt *xprt)
         */
        if (test_bit(XPT_TEMP, &xprt->xpt_flags))
                serv->sv_tmpcnt--;
+       spin_unlock_bh(&serv->sv_lock);
 
        while ((dr = svc_deferred_dequeue(xprt)) != NULL)
                kfree(dr);
 
        svc_xprt_put(xprt);
-       spin_unlock_bh(&serv->sv_lock);
 }
 
 void svc_close_xprt(struct svc_xprt *xprt)