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From:   YueHaibing <yuehaibing@huawei.com>
To:     <benh@kernel.crashing.org>, <paulus@samba.org>,
        <mpe@ellerman.id.au>, <nfont@linux.vnet.ibm.com>
CC:     <linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>,
        YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH v3 -next] powerpc/pseries/memory-hotplug: Fix return value type of find_aa_index
Date:   Tue, 9 Oct 2018 21:59:13 +0800
Message-ID: <20181009135913.14616-1-yuehaibing@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

'aa_index' is defined as an unsigned value, but find_aa_index
may return -1 when dlpar_clone_property fails. So change 
find_aa_index return value type to bool, which indicate 'aa_index'
whether found or not.

Fixes: c05a5a40969e ("powerpc/pseries: Dynamic add entires to associativity lookup array")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
v3: change find_aa_index return type to bool
v2: use 'rc' track the validation of aa_index
---
 arch/powerpc/platforms/pseries/hotplug-memory.c | 61 ++++++++++++-------------
 1 file changed, 28 insertions(+), 33 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index d26a771..4db510f 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -101,11 +101,12 @@ static struct property *dlpar_clone_property(struct property *prop,
 	return new_prop;
 }
 
-static u32 find_aa_index(struct device_node *dr_node,
-			 struct property *ala_prop, const u32 *lmb_assoc)
+static bool find_aa_index(struct device_node *dr_node,
+			 struct property *ala_prop,
+			 const u32 *lmb_assoc, u32 *aa_index)
 {
-	u32 *assoc_arrays;
-	u32 aa_index;
+	u32 *assoc_arrays, new_prop_size;
+	struct property *new_prop;
 	int aa_arrays, aa_array_entries, aa_array_sz;
 	int i, index;
 
@@ -121,46 +122,39 @@ static u32 find_aa_index(struct device_node *dr_node,
 	aa_array_entries = be32_to_cpu(assoc_arrays[1]);
 	aa_array_sz = aa_array_entries * sizeof(u32);
 
-	aa_index = -1;
 	for (i = 0; i < aa_arrays; i++) {
 		index = (i * aa_array_entries) + 2;
 
 		if (memcmp(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz))
 			continue;
 
-		aa_index = i;
-		break;
+		*aa_index = i;
+		return true;
 	}
 
-	if (aa_index == -1) {
-		struct property *new_prop;
-		u32 new_prop_size;
-
-		new_prop_size = ala_prop->length + aa_array_sz;
-		new_prop = dlpar_clone_property(ala_prop, new_prop_size);
-		if (!new_prop)
-			return -1;
-
-		assoc_arrays = new_prop->value;
+	new_prop_size = ala_prop->length + aa_array_sz;
+	new_prop = dlpar_clone_property(ala_prop, new_prop_size);
+	if (!new_prop)
+		return false;
 
-		/* increment the number of entries in the lookup array */
-		assoc_arrays[0] = cpu_to_be32(aa_arrays + 1);
+	assoc_arrays = new_prop->value;
 
-		/* copy the new associativity into the lookup array */
-		index = aa_arrays * aa_array_entries + 2;
-		memcpy(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz);
+	/* increment the number of entries in the lookup array */
+	assoc_arrays[0] = cpu_to_be32(aa_arrays + 1);
 
-		of_update_property(dr_node, new_prop);
+	/* copy the new associativity into the lookup array */
+	index = aa_arrays * aa_array_entries + 2;
+	memcpy(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz);
 
-		/*
-		 * The associativity lookup array index for this lmb is
-		 * number of entries - 1 since we added its associativity
-		 * to the end of the lookup array.
-		 */
-		aa_index = be32_to_cpu(assoc_arrays[0]) - 1;
-	}
+	of_update_property(dr_node, new_prop);
 
-	return aa_index;
+	/*
+	 * The associativity lookup array index for this lmb is
+	 * number of entries - 1 since we added its associativity
+	 * to the end of the lookup array.
+	 */
+	*aa_index = be32_to_cpu(assoc_arrays[0]) - 1;
+	return true;
 }
 
 static int update_lmb_associativity_index(struct drmem_lmb *lmb)
@@ -169,6 +163,7 @@ static int update_lmb_associativity_index(struct drmem_lmb *lmb)
 	struct property *ala_prop;
 	const u32 *lmb_assoc;
 	u32 aa_index;
+	bool is_found;
 
 	parent = of_find_node_by_path("/");
 	if (!parent)
@@ -200,11 +195,11 @@ static int update_lmb_associativity_index(struct drmem_lmb *lmb)
 		return -ENODEV;
 	}
 
-	aa_index = find_aa_index(dr_node, ala_prop, lmb_assoc);
+	is_found = find_aa_index(dr_node, ala_prop, lmb_assoc, &aa_index);
 
 	dlpar_free_cc_nodes(lmb_node);
 
-	if (aa_index < 0) {
+	if (!is_found) {
 		pr_err("Could not find LMB associativity\n");
 		return -1;
 	}
-- 
2.7.0