[PATCH] knfsd: svcrpc: gss: simplify rsc_parse()

Adopt a simpler convention for gss_mech_put(), to simplify rsc_parse().
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: NNeil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

net/sunrpc/auth_gss/gss_mech_switch.c

@@ -224,7 +224,8 @@ EXPORT_SYMBOL(gss_service_to_auth_domain_name);
 void
 gss_mech_put(struct gss_api_mech * gm)
 {
-	module_put(gm->gm_owner);
+	if (gm)
+		module_put(gm->gm_owner);
 }
 
 EXPORT_SYMBOL(gss_mech_put);
@@ -307,8 +308,7 @@ gss_delete_sec_context(struct gss_ctx	**context_handle)
 		(*context_handle)->mech_type->gm_ops
 			->gss_delete_sec_context((*context_handle)
 							->internal_ctx_id);
-	if ((*context_handle)->mech_type)
-		gss_mech_put((*context_handle)->mech_type);
+	gss_mech_put((*context_handle)->mech_type);
 	kfree(*context_handle);
 	*context_handle=NULL;
 	return GSS_S_COMPLETE;

net/sunrpc/auth_gss/svcauth_gss.c

@@ -425,6 +425,7 @@ static int rsc_parse(struct cache_detail *cd,
 	struct rsc rsci, *rscp = NULL;
 	time_t expiry;
 	int status = -EINVAL;
+	struct gss_api_mech *gm = NULL;
 
 	memset(&rsci, 0, sizeof(rsci));
 	/* context handle */
@@ -453,7 +454,6 @@ static int rsc_parse(struct cache_detail *cd,
 		set_bit(CACHE_NEGATIVE, &rsci.h.flags);
 	else {
 		int N, i;
-		struct gss_api_mech *gm;
 
 		/* gid */
 		if (get_int(&mesg, &rsci.cred.cr_gid))
@@ -488,21 +488,17 @@ static int rsc_parse(struct cache_detail *cd,
 		status = -EINVAL;
 		/* mech-specific data: */
 		len = qword_get(&mesg, buf, mlen);
-		if (len < 0) {
-			gss_mech_put(gm);
+		if (len < 0)
 			goto out;
-		}
 		status = gss_import_sec_context(buf, len, gm, &rsci.mechctx);
-		if (status) {
-			gss_mech_put(gm);
+		if (status)
 			goto out;
-		}
-		gss_mech_put(gm);
 	}
 	rsci.h.expiry_time = expiry;
 	rscp = rsc_update(&rsci, rscp);
 	status = 0;
 out:
+	gss_mech_put(gm);
 	rsc_free(&rsci);
 	if (rscp)
 		cache_put(&rscp->h, &rsc_cache);