linux-kernel - Re: [PATCH v5 5/8] r8152: Check for unplug in rtl_phy_patch

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Date:   Sat, 21 Oct 2023 08:03:21 -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 5/8] r8152: Check for unplug in rtl_phy_patch_request()

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
> rtl_phy_patch_request() we could end up looping for 10 seconds (2 ms *
> 5000 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 rtl_phy_patch_request()") new for v2.
>
>  drivers/net/usb/r8152.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 656fe90734fc..9888bc43e903 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -4046,6 +4046,9 @@ static int rtl_phy_patch_request(struct r8152 *tp, bool request, bool wait)
>         for (i = 0; wait && i < 5000; i++) {
>                 u32 ocp_data;
>
> +               if (test_bit(RTL8152_UNPLUG, &tp->flags))
> +                       break;
> +
>                 usleep_range(1000, 2000);
>                 ocp_data = ocp_reg_read(tp, OCP_PHY_PATCH_STAT);
>                 if ((ocp_data & PATCH_READY) ^ check)
> --
> 2.42.0.758.gaed0368e0e-goog
>