linux-kernel - Re: [PATCH v2] serial: omap: fix rs485 half-duplex filtering

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Message-ID: <YHf1zaPjh8WuTFzh@kroah.com>
Date:   Thu, 15 Apr 2021 10:14:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dario Binacchi <dariobin@...ero.it>
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v2] serial: omap: fix rs485 half-duplex filtering

On Sun, Apr 11, 2021 at 11:38:55AM +0200, Dario Binacchi wrote:
> Data received during half-duplex transmission must be filtered.
> If the target device responds quickly, emptying the FIFO at the end of
> the transmission can erase not only the echo characters but also part of
> the response message.
> By keeping the receive interrupt enabled even during transmission, it
> allows you to filter each echo character and only in a number equal to
> those transmitted.
> The issue was generated by a target device that started responding
> 240us later having received a request in communication at 115200bps.
> Sometimes, some messages received by the target were missing some of the
> first bytes.
> 
> Signed-off-by: Dario Binacchi <dariobin@...ero.it>
> 

What commit id does this patch "fix"?  Please resend that and add a
"Fixes:" tag right above your signed-off-by line.

thanks,

greg k-h