linux-kernel - Re: [PATCH 6/6] serial: imx: do not set RS485 enabled if it is not supported

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Date:   Fri, 29 Sep 2023 14:22:16 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     jirislaby@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        ilpo.jarvinen@...ux.intel.com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, l.sanfilippo@...bus.com,
        lukas@...ner.de, p.rosenberger@...bus.com
Subject: Re: [PATCH 6/6] serial: imx: do not set RS485 enabled if it is not
 supported



On 29.09.23 07:51, Greg KH wrote:
> On Fri, Sep 29, 2023 at 12:12:46AM +0200, Lino Sanfilippo wrote:
>> From: Lino Sanfilippo <l.sanfilippo@...bus.com>
>>
>> If the imx driver cannot support RS485 it sets the UARTS rs485_supported
>> structure to NULL. But it still calls uart_get_rs485_mode() which may set
>> the RS485_ENABLED flag.
>> The flag however is evaluated by the serial core in uart_configure_port()
>> at port startup and thus may lead to an attempt to configure RS485 even if
>> it is not supported.
>>
>> Avoid this by calling uart_get_rs485_mode() only if RS485 is actually
>> supported by the driver. Remove also a check for an error condition
>> that is not possible any more now.
>>
>> Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
>> ---
>>  drivers/tty/serial/imx.c | 14 ++++++--------
>>  1 file changed, 6 insertions(+), 8 deletions(-)
>
> Why is this patch not marked for stable?
>

Right, it should be, I will correct this, thanks!