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Commit ee13cbde authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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)"
parents 863da955 3581ced3

arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c

+20 −21
Original line number Diff line number Diff line
@@ -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;

}

arch/x86/kernel/cpu/cpufreq/powernow-k8.c

+5 −6
Original line number Diff line number Diff line
@@ -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;

drivers/cpufreq/cpufreq.c

+2 −10
Original line number Diff line number Diff line
@@ -1077,6 +1077,7 @@ static int cpufreq_add_dev(struct sys_device *sys_dev) 


err_unlock_policy:

	unlock_policy_rwsem_write(cpu);

	free_cpumask_var(policy->related_cpus);

err_free_cpumask:

	free_cpumask_var(policy->cpus);

err_free_policy:
@@ -1762,17 +1763,8 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data, 
			dprintk("governor switch\n");



			/* end old governor */

			if (data->governor) {

				/*

				 * Need to release the rwsem around governor

				 * stop due to lock dependency between

				 * cancel_delayed_work_sync and the read lock

				 * taken in the delayed work handler.

				 */

				unlock_policy_rwsem_write(data->cpu);

			if (data->governor)

				__cpufreq_governor(data, CPUFREQ_GOV_STOP);

				lock_policy_rwsem_write(data->cpu);

			}



			/* start new governor */

			data->governor = policy->governor;