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Message-ID: <20181009135913.14616-1-yuehaibing@huawei.com>
Date: Tue, 9 Oct 2018 21:59:13 +0800
From: YueHaibing <yuehaibing@...wei.com>
To: <benh@...nel.crashing.org>, <paulus@...ba.org>,
<mpe@...erman.id.au>, <nfont@...ux.vnet.ibm.com>
CC: <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v3 -next] powerpc/pseries/memory-hotplug: Fix return value type of find_aa_index
'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@...wei.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
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