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cpu/SMT: Move smt/control simple exit cases earlier

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Move the simple exit cases, i.e. those which don't depend on the value
written, earlier in the function. That makes it clearer that regardless of
the input those states cannot be transitioned out of.

That does have a user-visible effect, in that the error returned will
now always be EPERM/ENODEV for those states, regardless of the value
written. Previously writing an invalid value would return EINVAL even
when in those states.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20230705145143.40545-4-ldufour@linux.ibm.com
This commit is contained in:
Michael Ellerman 2023-07-05 16:51:36 +02:00 committed by Thomas Gleixner
parent 3f9169196b
commit c53361ce7d
1 changed files with 6 additions and 6 deletions
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12
kernel/cpu.c
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@ -2841,6 +2841,12 @@ __store_smt_control(struct device *dev, struct device_attribute *attr,
{
int ctrlval, ret;
if (cpu_smt_control == CPU_SMT_FORCE_DISABLED)
return -EPERM;
if (cpu_smt_control == CPU_SMT_NOT_SUPPORTED)
return -ENODEV;
if (sysfs_streq(buf, "on"))
ctrlval = CPU_SMT_ENABLED;
else if (sysfs_streq(buf, "off"))
@ -2850,12 +2856,6 @@ __store_smt_control(struct device *dev, struct device_attribute *attr,
else
return -EINVAL;
if (cpu_smt_control == CPU_SMT_FORCE_DISABLED)
return -EPERM;
if (cpu_smt_control == CPU_SMT_NOT_SUPPORTED)
return -ENODEV;
ret = lock_device_hotplug_sysfs();
if (ret)
return ret;