linux-kernel - Re: [PATCH] media: dvb_ringbuffer : Fix a bug in dvb

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Date:   Wed, 3 Aug 2022 21:04:51 +0900
From:   유용수 <yongsuyoo0215@...il.com>
To:     Hans Petter Selasky <hps@...asky.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        mchehab@...nel.org
Cc:     유용수 <yongsuyoo0215@...il.com>,
        0215yys@...mail.net
Subject: Re: [PATCH] media: dvb_ringbuffer : Fix a bug in dvb_ringbuffer.c

Dear All.
Too much time has already passed since I first sent this Email.
Can you share how this patch is going ?

2022년 6월 23일 (목) 오후 6:11, 유용수 <yongsuyoo0215@...il.com>님이 작성:
>
> Dear Kieran Bingham
>
> I sent E-mail again by Linux terminal by using the command " ... git
> send-email .."
> I believe that you will surely get the diff file.
>
> Thank you
>
> 2022년 6월 22일 (수) 오후 10:12, Hans Petter Selasky <hps@...asky.org>님이 작성:
> >
> > Hi Kieran,
> >
> > The consumed variable should not be negative. This bug has been there
> > since the beginning of the GIT at Linux from what I can see.
> >
> > +1
> >
> > --HPS
> >
> >  From 108c6acb2cc4bc4314b96f6f254a04b2873a096c Mon Sep 17 00:00:00 2001
> > From: YongSu Yoo <yongsuyoo0215@...il.com>
> > Date: Sun, 22 May 2022 04:53:12 +0000
> > Subject: [PATCH] media: dvb_ringbuffer : Fix a bug in dvb_ringbuffer.c
> >
> > Signed-off-by:Yongsu Yoo <yongsuyoo0215@...il.com>
> >
> > The function dvb_ringbuffer_pkt_next in
> > /linux-next/drviers/media/dvb-core/dvb_ringbuffer.c,
> > which searches the idx of the next valid packet in the ring
> > buffer of the ca->slot_info[slot].rx_buffer at
> > /linux-next/drivers/media/dvb-core/dvb_ca_en50221.c,
> > has the following problem.
> > In calculating the amounts of the consumed address of the ring
> > buffer, if the read address(rbuf->pread) of the ring buffer is
> > smaller than the idx, the amounts of the searched address
> > should be (idx - rbuf->pread),
> > whereas if the read address(rbuf->pread) of the ring buffer is
> > larger than the idx, the amounts of the consumed address should
> > be (idx - rbuf->pread + rbug->size). But there exists an
> > incorrect logic that the rbug-size was not properly added on
> > (idx - rbug->pread) in the later case. With this commit, we
> > fixed this bug.
> > ---
> >   drivers/media/dvb-core/dvb_ringbuffer.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/dvb-core/dvb_ringbuffer.c
> > b/drivers/media/dvb-core/dvb_ringbuffer.c
> > index d1d471af0636..7d4558de8e83 100644
> > --- a/drivers/media/dvb-core/dvb_ringbuffer.c
> > +++ b/drivers/media/dvb-core/dvb_ringbuffer.c
> > @@ -335,7 +335,9 @@ ssize_t dvb_ringbuffer_pkt_next(struct
> > dvb_ringbuffer *rbuf, size_t idx, size_t*
> >                 idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
> >         }
> >
> > -       consumed = (idx - rbuf->pread) % rbuf->size;
> > +       consumed = (idx - rbuf->pread);
> > +       if (consumed < 0)
> > +               consumed += rbuf->size;
> >
> >         while((dvb_ringbuffer_avail(rbuf) - consumed) >
> > DVB_RINGBUFFER_PKTHDRSIZE) {
> >
> > --
> > 2.17.1