linux-kernel - Re: [PATCH 2/3] SUNRPC: We only need to call svc_delete

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Message-Id: <1228090770.7112.14.camel@heimdal.trondhjem.org>
Date:	Sun, 30 Nov 2008 19:19:30 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	linux-nfs@...r.kernel.org, Max Kellermann <mk@...all.com>,
	linux-kernel@...r.kernel.org, gcosta@...hat.com,
	Grant Coady <grant_lkml@...o.com.au>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tom Tucker <tom@...ngridcomputing.com>
Subject: Re: [PATCH 2/3] SUNRPC: We only need to call svc_delete_xprt()
 once...

Use XPT_DEAD to ensure that we only call xpo_detach & friends once.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---

 net/sunrpc/svc_xprt.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)


diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index bf5b5cd..a417064 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -838,6 +838,10 @@ void svc_delete_xprt(struct svc_xprt *xprt)
 {
 	struct svc_serv	*serv = xprt->xpt_server;
 
+	/* Only do this once */
+	if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags) != 0)
+		return;
+
 	dprintk("svc: svc_delete_xprt(%p)\n", xprt);
 	xprt->xpt_ops->xpo_detach(xprt);
 
@@ -851,13 +855,14 @@ void svc_delete_xprt(struct svc_xprt *xprt)
 	 * while still attached to a queue, the queue itself
 	 * is about to be destroyed (in svc_destroy).
 	 */
-	if (!test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) {
-		BUG_ON(atomic_read(&xprt->xpt_ref.refcount) < 2);
-		if (test_bit(XPT_TEMP, &xprt->xpt_flags))
-			serv->sv_tmpcnt--;
-		svc_xprt_put(xprt);
-	}
+	if (test_bit(XPT_TEMP, &xprt->xpt_flags))
+		serv->sv_tmpcnt--;
 	spin_unlock_bh(&serv->sv_lock);
+
+	/* FIXME: Is this really needed here? */
+	BUG_ON(atomic_read(&xprt->xpt_ref.refcount) < 2);
+
+	svc_xprt_put(xprt);
 }
 
 void svc_close_xprt(struct svc_xprt *xprt)

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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