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SubjectRe: [PATCH v13 03/10] mux: minimal mux subsystem and gpio-based mux controller
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On 2017-04-21 16:23, Philipp Zabel wrote:
> On Thu, 2017-04-13 at 18:43 +0200, Peter Rosin wrote:
> [...]
>> +int mux_chip_register(struct mux_chip *mux_chip)
>> +{
>> + int i;
>> + int ret;
>> +
>> + for (i = 0; i < mux_chip->controllers; ++i) {
>> + struct mux_control *mux = &mux_chip->mux[i];
>> +
>> + if (mux->idle_state == mux->cached_state)
>> + continue;
>
> I think this should be changed to
>
> - if (mux->idle_state == mux->cached_state)
> + if (mux->idle_state == mux->cached_state ||
> + mux->idle_state == MUX_IDLE_AS_IS)
> continue;
>
> or the following mux_control_set will be called with state ==
> MUX_IDLE_AS_IS. Alternatively, mux_control_set should return when passed
> this value.

That cannot happen because ->cached_state is initialized to -1
in mux_chip_alloc, so should always be == MUX_IDLE_AS_IS when
registering. And drivers are not supposed to touch ->cached_state.
I.e., ->cached_state is "owned" by the core.

Cheers,
peda

>> + ret = mux_control_set(mux, mux->idle_state);
>> + if (ret < 0) {
>> + dev_err(&mux_chip->dev, "unable to set idle state\n");
>> + return ret;
>> + }
>> + }
>> +
>> + ret = device_add(&mux_chip->dev);
>> + if (ret < 0)
>> + dev_err(&mux_chip->dev,
>> + "device_add failed in mux_chip_register: %d\n", ret);
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(mux_chip_register);
>
> regards
> Philipp
>

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