sunrpc: get rid of use_gssp_lock

We can achieve the same result with a cmpxchg(). This also fixes a
potential race in use_gss_proxy(). The value of sn->use_gss_proxy could
go from -1 to 1 just after we check it in use_gss_proxy() but before we
acquire the spinlock. The procfile write would end up returning success
but the value would flip to 0 soon afterward. With this method we not
only avoid locking but the first "setter" always wins.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 18 insertions, 24 deletions

diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 60dc3700b2cb..2a935404047f 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1263,41 +1263,35 @@ out:
         return ret;
 }
 
-DEFINE_SPINLOCK(use_gssp_lock);
-
-static bool use_gss_proxy(struct net *net)
+/*
+ * Try to set the sn->use_gss_proxy variable to a new value. We only allow
+ * it to be changed if it's currently undefined (-1). If it's any other value
+ * then return -EBUSY unless the type wouldn't have changed anyway.
+ */
+static int set_gss_proxy(struct net *net, int type)
 {
         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+        int ret;
 
-        if (sn->use_gss_proxy != -1)
-                return sn->use_gss_proxy;
-        spin_lock(&use_gssp_lock);
-        /*
-         * If you wanted gss-proxy, you should have said so before
-         * starting to accept requests:
-         */
-        sn->use_gss_proxy = 0;
-        spin_unlock(&use_gssp_lock);
+        WARN_ON_ONCE(type != 0 && type != 1);
+        ret = cmpxchg(&sn->use_gss_proxy, -1, type);
+        if (ret != -1 && ret != type)
+                return -EBUSY;
         return 0;
 }
 
-#ifdef CONFIG_PROC_FS
-
-static int set_gss_proxy(struct net *net, int type)
+static bool use_gss_proxy(struct net *net)
 {
         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
-        int ret = 0;
 
-        WARN_ON_ONCE(type != 0 && type != 1);
-        spin_lock(&use_gssp_lock);
-        if (sn->use_gss_proxy == -1 || sn->use_gss_proxy == type)
-                sn->use_gss_proxy = type;
-        else
-                ret = -EBUSY;
-        spin_unlock(&use_gssp_lock);
-        return ret;
+        /* If use_gss_proxy is still undefined, then try to disable it */
+        if (sn->use_gss_proxy == -1)
+                set_gss_proxy(net, 0);
+        return sn->use_gss_proxy;
 }
 
+#ifdef CONFIG_PROC_FS
+
 static ssize_t write_gssp(struct file *file, const char __user *buf,
                          size_t count, loff_t *ppos)
 {