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x86/umwait: 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: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: x86@kernel.org Cc: "H. Peter Anvin" <hpa@zytor.com> Link: https://lore.kernel.org/r/20230313182918.1312597-10-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -232,7 +232,11 @@ static int __init umwait_init(void)
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* Add umwait control interface. Ignore failure, so at least the
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* default values are set up in case the machine manages to boot.
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*/
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dev = cpu_subsys.dev_root;
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return sysfs_create_group(&dev->kobj, &umwait_attr_group);
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dev = bus_get_dev_root(&cpu_subsys);
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if (dev) {
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ret = sysfs_create_group(&dev->kobj, &umwait_attr_group);
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put_device(dev);
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}
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return ret;
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}
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device_initcall(umwait_init);
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