From: Dan Carpenter <dan.carpenter@oracle.com>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Rob Clark <robdclark@gmail.com>, Hai Li <hali@codeaurora.org>,
Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
Daniel Vetter <daniel@ffwll.ch>,
Abhinav Kumar <abhinavk@codeaurora.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Jonathan Marek <jonathan@marek.ca>,
Yangtao Li <tiny.windzz@gmail.com>,
Nicolas Boichat <drinkcat@chromium.org>,
linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
freedreno@lists.freedesktop.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH 3/3] drm/msm/dsi: fix signedness bug in msm_dsi_host_cmd_rx()
Date: Mon, 4 Oct 2021 09:18:35 +0300 [thread overview]
Message-ID: <20211004061835.GQ2048@kadam> (raw)
In-Reply-To: <a61cad95-d81d-6f6d-33d4-f5259d9814cb@linaro.org>
On Sat, Oct 02, 2021 at 01:59:56AM +0300, Dmitry Baryshkov wrote:
> On 01/10/2021 15:36, Dan Carpenter wrote:
> > The "msg->tx_len" variable is type size_t so if dsi_cmds2buf_tx()
> > returns a negative error code that it type promoted to a high positive
> > value and treat as a success. The second problem with this code is
> > that it can return meaningless positive values on error.
>
> It looks to me that this piece of code is not fully correct at all.
> dsi_cmds2bus_tx would return the size of DSI packet, not the size of the DSI
> buffer.
>
> Could you please be more specific, which 'meaningless positive values' were
> you receiving?
>
Sorry, I misread the code. I thought it returned negatives or the
number of bytes copied. (This is from static analysis btw). Anyway,
returning only negatives is a much better way.
I will fix this patch and resend.
regards,
dan carpenter
next prev parent reply other threads:[~2021-10-04 6:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 12:33 [PATCH 1/3] drm/msm/dsi: Fix an error code in msm_dsi_modeset_init() Dan Carpenter
2021-10-01 12:34 ` [PATCH 2/3] drm/msm/dsi: fix off by one in dsi_bus_clk_enable error handling Dan Carpenter
2021-10-01 22:47 ` Dmitry Baryshkov
2021-10-01 12:36 ` [PATCH 3/3] drm/msm/dsi: fix signedness bug in msm_dsi_host_cmd_rx() Dan Carpenter
2021-10-01 22:59 ` Dmitry Baryshkov
2021-10-04 6:18 ` Dan Carpenter [this message]
2021-10-04 6:45 ` Dan Carpenter
2021-10-01 22:45 ` [PATCH 1/3] drm/msm/dsi: Fix an error code in msm_dsi_modeset_init() Dmitry Baryshkov
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