Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] powernow-k8: Limit Pstate transition latency check
  [CPUFREQ] Fix PCC driver error path
  [CPUFREQ] fix double freeing in error path of pcc-cpufreq
  [CPUFREQ] pcc driver should check for pcch method before calling _OSC
  [CPUFREQ] fix memory leak in cpufreq_add_dev
  [CPUFREQ] revert "[CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)"

2 files changed, 25 insertions, 27 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
index ce7cde713e71..a36de5bbb622 100644
--- a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
@@ -368,22 +368,16 @@ static int __init pcc_cpufreq_do_osc(acpi_handle *handle)
                 return -ENODEV;
 
         out_obj = output.pointer;
-        if (out_obj->type != ACPI_TYPE_BUFFER) {
-                ret = -ENODEV;
-                goto out_free;
-        }
+        if (out_obj->type != ACPI_TYPE_BUFFER)
+                return -ENODEV;
 
         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
-        if (errors) {
-                ret = -ENODEV;
-                goto out_free;
-        }
+        if (errors)
+                return -ENODEV;
 
         supported = *((u32 *)(out_obj->buffer.pointer + 4));
-        if (!(supported & 0x1)) {
-                ret = -ENODEV;
-                goto out_free;
-        }
+        if (!(supported & 0x1))
+                return -ENODEV;
 
 out_free:
         kfree(output.pointer);
@@ -397,13 +391,17 @@ static int __init pcc_cpufreq_probe(void)
         struct pcc_memory_resource *mem_resource;
         struct pcc_register_resource *reg_resource;
         union acpi_object *out_obj, *member;
-        acpi_handle handle, osc_handle;
+        acpi_handle handle, osc_handle, pcch_handle;
         int ret = 0;
 
         status = acpi_get_handle(NULL, "\\_SB", &handle);
         if (ACPI_FAILURE(status))
                 return -ENODEV;
 
+        status = acpi_get_handle(handle, "PCCH", &pcch_handle);
+        if (ACPI_FAILURE(status))
+                return -ENODEV;
+
         status = acpi_get_handle(handle, "_OSC", &osc_handle);
         if (ACPI_SUCCESS(status)) {
                 ret = pcc_cpufreq_do_osc(&osc_handle);
@@ -543,13 +541,13 @@ static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
         if (!pcch_virt_addr) {
                 result = -1;
-                goto pcch_null;
+                goto out;
         }
 
         result = pcc_get_offset(cpu);
         if (result) {
                 dprintk("init: PCCP evaluation failed\n");
-                goto free;
+                goto out;
         }
 
         policy->max = policy->cpuinfo.max_freq =
@@ -558,14 +556,15 @@ static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy)
                 ioread32(&pcch_hdr->minimum_frequency) * 1000;
         policy->cur = pcc_get_freq(cpu);
 
+        if (!policy->cur) {
+                dprintk("init: Unable to get current CPU frequency\n");
+                result = -EINVAL;
+                goto out;
+        }
+
         dprintk("init: policy->max is %d, policy->min is %d\n",
                 policy->max, policy->min);
-
-        return 0;
-free:
-        pcc_clear_mapping();
-        free_percpu(pcc_cpu_info);
-pcch_null:
+out:
         return result;
 }
 
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 7ec2123838e6..3e90cce3dc8b 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -1023,13 +1023,12 @@ static int get_transition_latency(struct powernow_k8_data *data)
         }
         if (max_latency == 0) {
                 /*
-                 * Fam 11h always returns 0 as transition latency.
-                 * This is intended and means "very fast". While cpufreq core
-                 * and governors currently can handle that gracefully, better
-                 * set it to 1 to avoid problems in the future.
-                 * For all others it's a BIOS bug.
+                 * Fam 11h and later may return 0 as transition latency. This
+                 * is intended and means "very fast". While cpufreq core and
+                 * governors currently can handle that gracefully, better set it
+                 * to 1 to avoid problems in the future.
                  */
-                if (boot_cpu_data.x86 != 0x11)
+                if (boot_cpu_data.x86 < 0x11)
                         printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
                                 "latency\n");
                 max_latency = 1;