cpufreq: use kzalloc() to allocate memory for cpufreq_frequency_table

Few drivers are using kmalloc() to allocate memory for frequency
tables and since we will have an additional field '.flags' in
'struct cpufreq_frequency_table', these might become unstable.
Better get these fixed by replacing kmalloc() by kzalloc() instead.

Along with that we also remove use of .driver_data from SPEAr driver
as it doesn't use it at all. Also, writing zero to .driver_data is not
required for powernow-k8 as it is already zero.

Reported-and-reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

6 files changed, 9 insertions, 13 deletions

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 822ca03a87f7..c91ef5785dfa 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -754,7 +754,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
                 goto err_unreg;
         }
 
-        data->freq_table = kmalloc(sizeof(*data->freq_table) *
+        data->freq_table = kzalloc(sizeof(*data->freq_table) *
                     (perf->state_count+1), GFP_KERNEL);
         if (!data->freq_table) {
                 result = -ENOMEM;
diff --git a/drivers/cpufreq/ia64-acpi-cpufreq.c b/drivers/cpufreq/ia64-acpi-cpufreq.c
index beb191b589d4..c30aaa6a54e8 100644
--- a/drivers/cpufreq/ia64-acpi-cpufreq.c
+++ b/drivers/cpufreq/ia64-acpi-cpufreq.c
@@ -254,7 +254,7 @@ acpi_cpufreq_cpu_init (
         }
 
         /* alloc freq_table */
-        data->freq_table = kmalloc(sizeof(*data->freq_table) *
+        data->freq_table = kzalloc(sizeof(*data->freq_table) *
                                    (data->acpi_data.state_count + 1),
                                    GFP_KERNEL);
         if (!data->freq_table) {
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index 5c440f87ba8a..d00e5d1abd25 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -475,7 +475,7 @@ static int longhaul_get_ranges(void)
                 return -EINVAL;
         }
 
-        longhaul_table = kmalloc((numscales + 1) * sizeof(*longhaul_table),
+        longhaul_table = kzalloc((numscales + 1) * sizeof(*longhaul_table),
                         GFP_KERNEL);
         if (!longhaul_table)
                 return -ENOMEM;
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index 770a9e1b3468..1b6ae6b57c11 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -623,7 +623,7 @@ static int fill_powernow_table(struct powernow_k8_data *data,
         if (check_pst_table(data, pst, maxvid))
                 return -EINVAL;
 
-        powernow_table = kmalloc((sizeof(*powernow_table)
+        powernow_table = kzalloc((sizeof(*powernow_table)
                 * (data->numps + 1)), GFP_KERNEL);
         if (!powernow_table) {
                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
@@ -793,7 +793,7 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
         }
 
         /* fill in data->powernow_table */
-        powernow_table = kmalloc((sizeof(*powernow_table)
+        powernow_table = kzalloc((sizeof(*powernow_table)
                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
         if (!powernow_table) {
                 pr_debug("powernow_table memory alloc failure\n");
@@ -810,7 +810,6 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 
         powernow_table[data->acpi_data.state_count].frequency =
                 CPUFREQ_TABLE_END;
-        powernow_table[data->acpi_data.state_count].driver_data = 0;
         data->powernow_table = powernow_table;
 
         if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
diff --git a/drivers/cpufreq/s3c24xx-cpufreq.c b/drivers/cpufreq/s3c24xx-cpufreq.c
index a3dc192d21f9..be1b2b5c9753 100644
--- a/drivers/cpufreq/s3c24xx-cpufreq.c
+++ b/drivers/cpufreq/s3c24xx-cpufreq.c
@@ -586,7 +586,7 @@ static int s3c_cpufreq_build_freq(void)
         size = cpu_cur.info->calc_freqtable(&cpu_cur, NULL, 0);
         size++;
 
-        ftab = kmalloc(sizeof(*ftab) * size, GFP_KERNEL);
+        ftab = kzalloc(sizeof(*ftab) * size, GFP_KERNEL);
         if (!ftab) {
                 printk(KERN_ERR "%s: no memory for tables\n", __func__);
                 return -ENOMEM;
@@ -664,7 +664,7 @@ int __init s3c_plltab_register(struct cpufreq_frequency_table *plls,
 
         size = sizeof(*vals) * (plls_no + 1);
 
-        vals = kmalloc(size, GFP_KERNEL);
+        vals = kzalloc(size, GFP_KERNEL);
         if (vals) {
                 memcpy(vals, plls, size);
                 pll_reg = vals;
diff --git a/drivers/cpufreq/spear-cpufreq.c b/drivers/cpufreq/spear-cpufreq.c
index 4cfdcff8a310..38678396636d 100644
--- a/drivers/cpufreq/spear-cpufreq.c
+++ b/drivers/cpufreq/spear-cpufreq.c
@@ -195,18 +195,15 @@ static int spear_cpufreq_probe(struct platform_device *pdev)
         cnt = prop->length / sizeof(u32);
         val = prop->value;
 
-        freq_tbl = kmalloc(sizeof(*freq_tbl) * (cnt + 1), GFP_KERNEL);
+        freq_tbl = kzalloc(sizeof(*freq_tbl) * (cnt + 1), GFP_KERNEL);
         if (!freq_tbl) {
                 ret = -ENOMEM;
                 goto out_put_node;
         }
 
-        for (i = 0; i < cnt; i++) {
-                freq_tbl[i].driver_data = i;
+        for (i = 0; i < cnt; i++)
                 freq_tbl[i].frequency = be32_to_cpup(val++);
-        }
 
-        freq_tbl[i].driver_data = i;
         freq_tbl[i].frequency = CPUFREQ_TABLE_END;
 
         spear_cpufreq.freq_tbl = freq_tbl;