linux-kernel - Re: [PATCH 23/26] serial: sunsu: drop low-latency workaround

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Message-Id: <20210421.095615.459544163755192519.davem@davemloft.net>
Date:   Wed, 21 Apr 2021 09:56:15 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     johan@...nel.org
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 23/26] serial: sunsu: drop low-latency workaround

From: Johan Hovold <johan@...nel.org>
Date: Wed, 21 Apr 2021 11:55:06 +0200

> The sunsu driver has been carrying a workaround for the infamous
> low_latency behaviour of tty_flip_buffer_push() by dropping and
> reacquiring the port lock in the interrupt handler since 2004.
> 
> Since commit a9c3f68f3cd8 ("tty: Fix low_latency BUG"),
> tty_flip_buffer_push() always schedules a work item to push data to the
> line discipline and there's no need to keep any low_latency hacks around.
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Acked-by: David S. Miller <davem@...emloft.net>