linux-kernel - Re: [PATCH v3] tty: serial: qcom_geni

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Date:   Mon, 03 Dec 2018 08:22:15 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Ryan Case <ryandcase@...omium.org>
Cc:     Evan Green <evgreen@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Ryan Case <ryandcase@...omium.org>
Subject: Re: [PATCH v3] tty: serial: qcom_geni_serial: Fix softlock

Quoting Ryan Case (2018-11-29 18:18:40)
> Transfers were being divided into device FIFO sized (64 byte max)
> operations which would poll for completion within a spin_lock_irqsave /
> spin_unlock_irqrestore block. This both made things slow by waiting for
> the FIFO to completely drain before adding further data and would also
> result in softlocks on large transmissions.
> 
> This patch allows larger transfers with continuous FIFO additions as
> space becomes available and removes polling from the interrupt handler.
> 
> Signed-off-by: Ryan Case <ryandcase@...omium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>