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SubjectRe: [PATCH v12 1/1] serial: core: Start managing serial controllers to enable runtime PM
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On 01/06/2023 11:44, Tony Lindgren wrote:
> Hi,
>
> * Steven Price <steven.price@arm.com> [230601 10:04]:
>> I haven't studied this change in detail, but I assume the bug is that
>> serial_base_port_device_remove() shouldn't be dropping port_mutex. The
>> below hack gets my board booting again.
>
> You're right. I wonder how I managed to miss that.. Care to post a proper
> fix for this or do you want me to post it?

I'll post a proper fix shortly. Thanks for the confirmation of the fix.

>> Thanks,
>>
>> Steve
>>
>> Hack fix:
>> ----8<----
>> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
>> index 29bd5ede0b25..044e4853341a 100644
>> --- a/drivers/tty/serial/serial_core.c
>> +++ b/drivers/tty/serial/serial_core.c
>> @@ -3234,8 +3234,7 @@ static void serial_core_remove_one_port(struct uart_driver *drv,
>> wait_event(state->remove_wait, !atomic_read(&state->refcount));
>> state->uart_port = NULL;
>> mutex_unlock(&port->mutex);
>> -out:
>> - mutex_unlock(&port_mutex);
>> +out:;
>> }
>
> Seems you can remove out here and just do a return earlier instead of goto.

Yes, this was just the smallest change. I'll do it properly with an
early return in the proper patch.

Thanks,

Steve

> Regards,
>
> Tony

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