From: Ricardo Ribalda <ribalda@chromium.org>
To: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
Martin Tuma <martin.tuma@digiteqautomotive.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Hugues Fruchet <hugues.fruchet@foss.st.com>,
Alain Volmat <alain.volmat@foss.st.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Chen-Yu Tsai <wens@csie.org>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Samuel Holland <samuel@sholland.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Sowjanya Komatineni <skomatineni@nvidia.com>,
Luca Ceresoli <luca.ceresoli@bootlin.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Hans Verkuil <hverkuil@xs4all.nl>,
Sergey Kozlov <serjk@netup.ru>, Abylay Ospan <aospan@netup.ru>,
Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>,
Dmitry Osipenko <digetx@gmail.com>,
Benjamin Mugnier <benjamin.mugnier@foss.st.com>,
Sylvain Petinot <sylvain.petinot@foss.st.com>,
Stanimir Varbanov <stanimir.k.varbanov@gmail.com>,
Vikash Garodia <quic_vgarodia@quicinc.com>,
"Bryan O'Donoghue" <bryan.odonoghue@linaro.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-staging@lists.linux.dev, linux-sunxi@lists.linux.dev,
linux-tegra@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v3 26/26] media: dvb-frontends: tda10048: Make the range of z explicit.
Date: Fri, 3 May 2024 13:56:44 +0200 [thread overview]
Message-ID: <CANiDSCsU+jgYkUmHZOC8xPsL2DbgU7_sWrby1bQAXQNnp+g6Bg@mail.gmail.com> (raw)
In-Reply-To: <c4287024-8012-458d-9829-15ffbceb25cf@moroto.mountain>
I am trying to get the DS, but
https://www.nxp.com/acrobat_download/literature/9397/75015931.pdf is a
dead links now.
Anyone have access to the datasheet?
Thanks!
On Fri, 3 May 2024 at 13:55, Dan Carpenter <dan.carpenter@linaro.org> wrote:
>
> On Fri, May 03, 2024 at 11:27:58AM +0100, Mauro Carvalho Chehab wrote:
> > Em Mon, 29 Apr 2024 15:05:05 +0000
> > Ricardo Ribalda <ribalda@chromium.org> escreveu:
> >
> > > We do not expect the sample_freq to be over 613MHz.
> > >
> > > Found by cocci:
> > > drivers/media/dvb-frontends/tda10048.c:345:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_u64 instead.
> > >
> > > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > > ---
> > > drivers/media/dvb-frontends/tda10048.c | 4 +++-
> > > 1 file changed, 3 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/media/dvb-frontends/tda10048.c b/drivers/media/dvb-frontends/tda10048.c
> > > index 3e725cdcc66b..1886f733dbbf 100644
> > > --- a/drivers/media/dvb-frontends/tda10048.c
> > > +++ b/drivers/media/dvb-frontends/tda10048.c
> > > @@ -328,7 +328,8 @@ static int tda10048_set_wref(struct dvb_frontend *fe, u32 sample_freq_hz,
> > > u32 bw)
> > > {
> > > struct tda10048_state *state = fe->demodulator_priv;
> > > - u64 t, z;
> > > + u32 z;
> > > + u64 t;
> > >
> > > dprintk(1, "%s()\n", __func__);
> > >
> > > @@ -341,6 +342,7 @@ static int tda10048_set_wref(struct dvb_frontend *fe, u32 sample_freq_hz,
> > > /* t *= 2147483648 on 32bit platforms */
> > > t *= (2048 * 1024);
> > > t *= 1024;
> > > + /* Sample frequency is under 613MHz */
> >
> > Are you sure about that? Some DVB devices have very high frequency
> > clocks, specially if they're also used for satellite, so I can't
> > be sure by just looking at the driver's code.
> >
> > Also, we had already a bunch of regressions with "fixes" like this
> > that actually broke frontend drivers.
>
> This patch preserves the existing behavior. The sample_freq_hz variable
> is a u32 so, in the original code, z couldn't have been more than
> U32_MAX even though it was declared as a u64.
>
> It's possible that the original code was wrong. We have seen that in
> other places in this patchset. Adding a note about the datasheet is
> also a good idea.
>
> regards,
> dan carpenter
>
--
Ricardo Ribalda
next prev parent reply other threads:[~2024-05-03 11:57 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-29 15:04 [PATCH v3 00/26] media: Fix coccinelle warning/errors Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 01/26] media: pci: mgb4: Refactor struct resources Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 02/26] media: stb0899: Simplify check Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 03/26] media: uvcvideo: Refactor iterators Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 04/26] media: uvcvideo: Use max() macro Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 05/26] media: go7007: Use min and max macros Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 06/26] media: stm32-dcmipp: Remove redundant printk Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 07/26] media: staging: sun6i-isp: " Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 08/26] media: dvb-frontends: tda18271c2dd: Remove casting during div Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 09/26] media: v4l: async: refactor v4l2_async_create_ancillary_links Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 10/26] staging: media: tegra-video: Use swap macro Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 11/26] media: s2255: Use refcount_t instead of atomic_t for num_channels Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 12/26] media: platform: mtk-mdp3: Use refcount_t for job_count Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 13/26] media: common: saa7146: Use min macro Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 14/26] media: dvb-frontends: drx39xyj: " Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 15/26] media: netup_unidvb: " Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 16/26] media: au0828: Use umin macro Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 17/26] media: flexcop-usb: Use min macro Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 18/26] media: gspca: cpia1: " Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 19/26] media: stk1160: " Ricardo Ribalda
2024-04-29 15:04 ` [PATCH v3 20/26] media: tegra-vde: Refactor timeout handling Ricardo Ribalda
2024-04-29 15:05 ` [PATCH v3 21/26] media: i2c: st-mipid02: Use the correct div function Ricardo Ribalda
2024-04-29 15:05 ` [PATCH v3 22/26] media: tc358746: Use the correct div_ function Ricardo Ribalda
2024-04-29 15:05 ` [PATCH v3 23/26] media: venus: vdec: Make the range of us_per_frame explicit Ricardo Ribalda
2024-04-29 15:05 ` [PATCH v3 24/26] media: venus: venc: " Ricardo Ribalda
2024-04-29 15:05 ` [PATCH v3 25/26] media: dvb-frontends: tda10048: Fix integer overflow Ricardo Ribalda
2024-04-29 15:05 ` [PATCH v3 26/26] media: dvb-frontends: tda10048: Make the range of z explicit Ricardo Ribalda
2024-05-03 10:27 ` Mauro Carvalho Chehab
2024-05-03 11:55 ` Dan Carpenter
2024-05-03 11:56 ` Ricardo Ribalda [this message]
2024-05-03 14:08 ` Dragan Simic
2024-05-13 13:35 ` Ricardo Ribalda
2024-05-13 14:25 ` Michael Ira Krufky
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