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cpufreq: Return 0 from ->fast_switch() on errors

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CPUFREQ_ENTRY_INVALID is a special symbol which is used to specify that
an entry in the cpufreq table is invalid. But using it outside of the
scope of the cpufreq table looks a bit incorrect.

We can represent an invalid frequency by writing it as 0 instead if we
need. Note that it is already done that way for the return value of the
->get() callback.

Lets do the same for ->fast_switch() and not use CPUFREQ_ENTRY_INVALID
outside of the scope of cpufreq table.

Also update the comment over cpufreq_driver_fast_switch() to clearly
mention what this returns.

None of the drivers return CPUFREQ_ENTRY_INVALID as of now from
->fast_switch() callback and so we don't need to update any of those.

Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Viresh Kumar 2017-08-09 10:21:46 +05:30 • committed by Rafael J. Wysocki
commit 209887e6b9
2 changed files with 5 additions and 4 deletions
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7
drivers/cpufreq/cpufreq.c
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@ -1817,9 +1817,10 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier);
* twice in parallel for the same policy and that it will never be called in
* parallel with either ->target() or ->target_index() for the same policy.
*
* If CPUFREQ_ENTRY_INVALID is returned by the driver's ->fast_switch()
* callback to indicate an error condition, the hardware configuration must be
* preserved.
* Returns the actual frequency set for the CPU.
*
* If 0 is returned by the driver's ->fast_switch() callback to indicate an
* error condition, the hardware configuration must be preserved.
*/
unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
unsigned int target_freq)