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

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Date:   Thu, 29 Nov 2018 18:22:41 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     ryandcase@...omium.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Evan Green <evgreen@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-serial@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH v3] tty: serial: qcom_geni_serial: Fix softlock

Hi,

On Thu, Nov 29, 2018 at 6:19 PM Ryan Case <ryandcase@...omium.org> wrote:
>
> 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>
> ---
>
> Changes in v3:
> - Reworded comment for clarity
> - Fixed mips compiler warning
>
> Changes in v2:
> - Addressed nits raised by Stephen
>
>  drivers/tty/serial/qcom_geni_serial.c | 56 +++++++++++++++++++--------
>  1 file changed, 39 insertions(+), 17 deletions(-)

Looks happy to me now.  Thanks and sorry for misunderstanding how
"active" worked on v2.

Reviewed-by: Douglas Anderson <dianders@...omium.org>