sunrpc: remove unnecessary svc_xprt_put

commit ab1b18f70a007ea6caeb007d269abb75b131a410 upstream.

The 'struct svc_deferred_req's on the xpt_deferred queue do not
own a reference to the owning xprt.  This is seen in svc_revisit
which is where things are added to this queue.  dr->xprt is set to
NULL and the reference to the xprt it put.

So when this list is cleaned up in svc_delete_xprt, we mustn't
put the reference.

Also, replace the 'for' with a 'while' which is arguably
simpler and more likely to compile efficiently.

Cc: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 0266ccada52af7eabbc833cc912c75f63cae49c4..dafd3414e7113a342ffe91c918b9f8e6f7f0dac4 100644 (file)
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -901,11 +901,8 @@ void svc_delete_xprt(struct svc_xprt *xprt)
        if (test_bit(XPT_TEMP, &xprt->xpt_flags))
                serv->sv_tmpcnt--;
 
-       for (dr = svc_deferred_dequeue(xprt); dr;
-            dr = svc_deferred_dequeue(xprt)) {
-               svc_xprt_put(xprt);
+       while ((dr = svc_deferred_dequeue(xprt)) != NULL)
                kfree(dr);
-       }
 
        svc_xprt_put(xprt);
        spin_unlock_bh(&serv->sv_lock);