Commit af48ab8b authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

ACPI: LPIT: move to use bus_get_dev_root() 



Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20230322083646.2937580-1-gregkh@linuxfoundation.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cb4a0bec

drivers/acpi/acpi_lpit.c

+11 −5
Original line number Diff line number Diff line
@@ -98,6 +98,12 @@ EXPORT_SYMBOL_GPL(lpit_read_residency_count_address); 
static void lpit_update_residency(struct lpit_residency_info *info,

				 struct acpi_lpit_native *lpit_native)

{

	struct device *dev_root = bus_get_dev_root(&cpu_subsys);



	/* Silently fail, if cpuidle attribute group is not present */

	if (!dev_root)

		return;



	info->frequency = lpit_native->counter_frequency ?

				lpit_native->counter_frequency : tsc_khz * 1000;

	if (!info->frequency)
@@ -108,18 +114,18 @@ static void lpit_update_residency(struct lpit_residency_info *info, 
		info->iomem_addr = ioremap(info->gaddr.address,

						   info->gaddr.bit_width / 8);

		if (!info->iomem_addr)

			return;

			goto exit;



		/* Silently fail, if cpuidle attribute group is not present */

		sysfs_add_file_to_group(&cpu_subsys.dev_root->kobj,

		sysfs_add_file_to_group(&dev_root->kobj,

					&dev_attr_low_power_idle_system_residency_us.attr,

					"cpuidle");

	} else if (info->gaddr.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {

		/* Silently fail, if cpuidle attribute group is not present */

		sysfs_add_file_to_group(&cpu_subsys.dev_root->kobj,

		sysfs_add_file_to_group(&dev_root->kobj,

					&dev_attr_low_power_idle_cpu_residency_us.attr,

					"cpuidle");

	}

exit:

	put_device(dev_root);

}



static void lpit_process(u64 begin, u64 end)