linux-kernel - Re: [PATCH net v2 2/5] r8152: Add RTL8152

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Message-ID: <CAD=FV=VOdj5z76Rvue93MUriGhX2Arijo-ZMifHw=qO6kxbjtQ@mail.gmail.com>
Date:   Wed, 29 Nov 2023 13:26:52 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Hayes Wang <hayeswang@...ltek.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Laura Nao <laura.nao@...labora.com>,
        Edward Hill <ecgh@...omium.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Grant Grundler <grundler@...omium.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Simon Horman <horms@...nel.org>,
        Bjørn Mork <bjorn@...k.no>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net v2 2/5] r8152: Add RTL8152_INACCESSIBLE checks to more loops

Hi,

On Wed, Nov 29, 2023 at 4:47 AM Hayes Wang <hayeswang@...ltek.com> wrote:
>
> Douglas Anderson <dianders@...omium.org>
> > Sent: Wednesday, November 29, 2023 5:38 AM
> [...]
> > @@ -3000,6 +3000,8 @@ static void rtl8152_nic_reset(struct r8152 *tp)
> >                 ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CR, CR_RST);
> >
> >                 for (i = 0; i < 1000; i++) {
> > +                       if (test_bit(RTL8152_INACCESSIBLE, &tp->flags))
> > +                               return;
> >                         if (!(ocp_read_byte(tp, MCU_TYPE_PLA, PLA_CR) & CR_RST))
> >                                 break;
> >                         usleep_range(100, 400);
> > @@ -3329,6 +3331,8 @@ static void rtl_disable(struct r8152 *tp)
> >         rxdy_gated_en(tp, true);
> >
> >         for (i = 0; i < 1000; i++) {
> > +               if (test_bit(RTL8152_INACCESSIBLE, &tp->flags))
> > +                       return;
>
> I think you have to replace return with break.
> Otherwise, rtl_stop_rx() wouldn't be called.
> And, you may free the memory which is using, when rtl8152_close () is called.
>
> >                 ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
> >                 if ((ocp_data & FIFO_EMPTY) == FIFO_EMPTY)
> >                         break;
> > @@ -3336,6 +3340,8 @@ static void rtl_disable(struct r8152 *tp)
> >         }
> >
> >         for (i = 0; i < 1000; i++) {
> > +               if (test_bit(RTL8152_INACCESSIBLE, &tp->flags))
> > +                       return;
>
> Same as above.

Good catch, thanks! I've changed all of the `return` statements in
this patch to `break` for consistency, though for the other ones it
doesn't really matter. For patch #3 I also changed the `return` to a
`break`, but for patches #4 and #5 the return was better so I left
those.

v3 posted now with this fix.

-Doug