Re: [PATCH] serial: don't announce CIR serial ports
From: Maciej S. Szmigiero
Date: Tue Aug 04 2015 - 19:25:43 EST
Hi Peter,
Thanks for looking into it.
On 04.08.2015 03:46, Peter Hurley wrote:
> Hi Maciej,
>
> On 08/02/2015 05:09 PM, Maciej S. Szmigiero wrote:
>> CIR type serial ports aren't real serial ports.
>> This is just a way to prevent legacy serial driver
>> from probing and eventually binding some resources
>> so don't announce them like normal serial ports.
>
> I'd like to keep some form of reporting so that we know the
> port was properly probed; what about extending uart_report_port()
> to including CIR + disabled status?
Currently the printed message looks like this:
"00:01: ttyS2 at I/O 0x3e8 (irq = 7, base_baud = 115200) is a CIR port".
I think it would be best to skip a device file name in this case,
since this is how user sees (and uses) a real serial port.
The message would be then:
"00:01 at I/O 0x3e8 (irq = 7, base_baud = 115200) is a CIR port".
The dev name will always be present since the only current
"source" of CIR ports is PNP 8250 driver which sets
dev pointer uncondtionally.
> Secondly, good catch! Because we should not be trying to
> register a console on this port, nor driving modem signals.
>
> So maybe an early exit after uart_report_port?
All right, I will resubmit updated patch tomorrow.
> Regards,
> Peter Hurley
Best regards,
Maciej Szmigiero
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/