linux-kernel - Re: [PATCH v1 1/1] serial: 8250_pci1xxxx: Drop quirk from 8250

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Date: Sat, 17 Feb 2024 17:46:02 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Rengarajan S <rengarajan.s@...rochip.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>,
	Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
	Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v1 1/1] serial: 8250_pci1xxxx: Drop quirk from 8250_port

On Wed, Feb 14, 2024 at 03:50:09PM +0200, Andy Shevchenko wrote:
> We are not supposed to spread quirks in 8250_port module especially
> when we have a separate driver for the hardware in question.
> 
> Move quirk from generic module to the driver that uses it.
> 
> While at it, move IO to ->set_divisor() callback as it has to be from
> day 1. ->get_divisor() is not supposed to perform any IO as UART port:
> - might not be powered on
> - is not locked by a spin lock
> 
> Fixes: 1ed67ecd1349 ("8250: microchip: Add 4 Mbps support in PCI1XXXX UART")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Breaks the build:

drivers/tty/serial/8250/8250_port.c: In function ‘serial8250_get_baud_rate’:
drivers/tty/serial/8250/8250_port.c:2684:32: error: unused variable ‘up’ [-Werror=unused-variable]
 2684 |         struct uart_8250_port *up = up_to_u8250p(port);
      |                                ^~
cc1: all warnings being treated as errors