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;