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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 09:36:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 20:25:18 +0100 |
| commit | af48ab8b39ee9e4c4593a5da6e2501ebb8f99b12 (patch) | |
| tree | 009fbdc554ba14125bc270e3383743a1eb51c76e /drivers/acpi/acpi_lpit.c | |
| parent | cb4a0bec0bb982991b27d6826f3372890cebb8ab (diff) | |
| download | linux-af48ab8b39ee9e4c4593a5da6e2501ebb8f99b12.tar.gz linux-af48ab8b39ee9e4c4593a5da6e2501ebb8f99b12.tar.bz2 linux-af48ab8b39ee9e4c4593a5da6e2501ebb8f99b12.zip | |
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: 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>
Diffstat (limited to 'drivers/acpi/acpi_lpit.c')
| -rw-r--r-- | drivers/acpi/acpi_lpit.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c index 3843d2576d3f..c5598b6d5db8 100644 --- a/drivers/acpi/acpi_lpit.c +++ b/drivers/acpi/acpi_lpit.c @@ -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) |