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ACPI: LPIT: move to use bus_get_dev_root()

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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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20230322083646.2937580-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2023-03-22 09:36:46 +01:00
parent cb4a0bec0b
commit af48ab8b39
1 changed files with 11 additions and 5 deletions
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16
drivers/acpi/acpi_lpit.c
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@ -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)