linux-kernel - Re: [PATCH v5 6/8] r8152: Check for unplug in r8153b_ups_en() / r8153c_ups

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Message-ID: <CANEJEGudwc1=f69L5TAB4+Bdv0aa+y6BQCfLwoDgQ8dizx2=5A@mail.gmail.com>
Date:   Sat, 21 Oct 2023 08:05:18 -0700
From:   Grant Grundler <grundler@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Hayes Wang <hayeswang@...ltek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Edward Hill <ecgh@...omium.org>,
        Laura Nao <laura.nao@...labora.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Simon Horman <horms@...nel.org>, linux-usb@...r.kernel.org,
        Grant Grundler <grundler@...omium.org>,
        Bjørn Mork <bjorn@...k.no>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v5 6/8] r8152: Check for unplug in r8153b_ups_en() / r8153c_ups_en()

On Fri, Oct 20, 2023 at 2:08 PM Douglas Anderson <dianders@...omium.org> wrote:
>
> If the adapter is unplugged while we're looping in r8153b_ups_en() /
> r8153c_ups_en() we could end up looping for 10 seconds (20 ms * 500
> loops). Add code similar to what's done in other places in the driver
> to check for unplug and bail.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Grant Grundler <grundler@...omium.org>

> ---
>
> (no changes since v2)
>
> Changes in v2:
> - ("Check for unplug in r8153b_ups_en() / r8153c_ups_en()") new for v2.
>
>  drivers/net/usb/r8152.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 9888bc43e903..982f9ca03e7a 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -3663,6 +3663,8 @@ static void r8153b_ups_en(struct r8152 *tp, bool enable)
>                         int i;
>
>                         for (i = 0; i < 500; i++) {
> +                               if (test_bit(RTL8152_UNPLUG, &tp->flags))
> +                                       return;
>                                 if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_BOOT_CTRL) &
>                                     AUTOLOAD_DONE)
>                                         break;
> @@ -3703,6 +3705,8 @@ static void r8153c_ups_en(struct r8152 *tp, bool enable)
>                         int i;
>
>                         for (i = 0; i < 500; i++) {
> +                               if (test_bit(RTL8152_UNPLUG, &tp->flags))
> +                                       return;
>                                 if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_BOOT_CTRL) &
>                                     AUTOLOAD_DONE)
>                                         break;
> --
> 2.42.0.758.gaed0368e0e-goog
>