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References: <20231020210751.3415723-1-dianders@chromium.org> <20231020140655.v5.6.I6405b1587446c157c6d6263957571f2b11f330a7@changeid>
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From:   Grant Grundler <grundler@chromium.org>
Date:   Sat, 21 Oct 2023 08:05:18 -0700
Message-ID: <CANEJEGudwc1=f69L5TAB4+Bdv0aa+y6BQCfLwoDgQ8dizx2=5A@mail.gmail.com>
Subject: Re: [PATCH v5 6/8] r8152: Check for unplug in r8153b_ups_en() / r8153c_ups_en()
To:     Douglas Anderson <dianders@chromium.org>
Cc:     Jakub Kicinski <kuba@kernel.org>,
        Hayes Wang <hayeswang@realtek.com>,
        "David S . Miller" <davem@davemloft.net>,
        Edward Hill <ecgh@chromium.org>,
        Laura Nao <laura.nao@collabora.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Simon Horman <horms@kernel.org>, linux-usb@vger.kernel.org,
        Grant Grundler <grundler@chromium.org>,
        =?UTF-8?Q?Bj=C3=B8rn_Mork?= <bjorn@mork.no>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org
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On Fri, Oct 20, 2023 at 2:08=E2=80=AFPM Douglas Anderson <dianders@chromium=
.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@chromium.org>

Reviewed-by: Grant Grundler <grundler@chromium.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 en=
able)
>                         int i;
>
>                         for (i =3D 0; i < 500; i++) {
> +                               if (test_bit(RTL8152_UNPLUG, &tp->flags))
> +                                       return;
>                                 if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_B=
OOT_CTRL) &
>                                     AUTOLOAD_DONE)
>                                         break;
> @@ -3703,6 +3705,8 @@ static void r8153c_ups_en(struct r8152 *tp, bool en=
able)
>                         int i;
>
>                         for (i =3D 0; i < 500; i++) {
> +                               if (test_bit(RTL8152_UNPLUG, &tp->flags))
> +                                       return;
>                                 if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_B=
OOT_CTRL) &
>                                     AUTOLOAD_DONE)
>                                         break;
> --
> 2.42.0.758.gaed0368e0e-goog
>