From: Sam Ravnborg <sam@ravnborg.org>
To: trix@redhat.com
Cc: jernej.skrabec@siol.net, jonas@kwiboo.se, airlied@linux.ie,
dri-devel@lists.freedesktop.org, narmstrong@baylibre.com,
architt@codeaurora.org, stable@vger.kernel.org,
linux-kernel@vger.kernel.org, a.hajda@samsung.com,
Laurent.pinchart@ideasonboard.com
Subject: Re: [PATCH] drm/bridge: sil_sii8620: initialize return of sii8620_readb
Date: Mon, 13 Jul 2020 18:00:10 +0200 [thread overview]
Message-ID: <20200713160010.GA1223330@ravnborg.org> (raw)
In-Reply-To: <20200712152453.27510-1-trix@redhat.com>
Hi Tom.
On Sun, Jul 12, 2020 at 08:24:53AM -0700, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
>
> clang static analysis flags this error
>
> sil-sii8620.c:184:2: warning: Undefined or garbage value
> returned to caller [core.uninitialized.UndefReturn]
> return ret;
> ^~~~~~~~~~
>
> sii8620_readb calls sii8620_read_buf.
> sii8620_read_buf can return without setting its output
> pararmeter 'ret'.
>
> So initialize ret.
>
> Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")
>
> Signed-off-by: Tom Rix <trix@redhat.com>
Thnaks, applied to drm-misc-next as the fix is not urgent.
Sam
> ---
> drivers/gpu/drm/bridge/sil-sii8620.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
> index 3540e4931383..da933d477e5f 100644
> --- a/drivers/gpu/drm/bridge/sil-sii8620.c
> +++ b/drivers/gpu/drm/bridge/sil-sii8620.c
> @@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
>
> static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
> {
> - u8 ret;
> + u8 ret = 0;
>
> sii8620_read_buf(ctx, addr, &ret, 1);
> return ret;
> --
> 2.18.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: Sam Ravnborg <sam@ravnborg.org>
To: trix@redhat.com
Cc: a.hajda@samsung.com, narmstrong@baylibre.com,
Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
jernej.skrabec@siol.net, airlied@linux.ie, daniel@ffwll.ch,
architt@codeaurora.org, stable@vger.kernel.org,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] drm/bridge: sil_sii8620: initialize return of sii8620_readb
Date: Mon, 13 Jul 2020 18:00:10 +0200 [thread overview]
Message-ID: <20200713160010.GA1223330@ravnborg.org> (raw)
In-Reply-To: <20200712152453.27510-1-trix@redhat.com>
Hi Tom.
On Sun, Jul 12, 2020 at 08:24:53AM -0700, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
>
> clang static analysis flags this error
>
> sil-sii8620.c:184:2: warning: Undefined or garbage value
> returned to caller [core.uninitialized.UndefReturn]
> return ret;
> ^~~~~~~~~~
>
> sii8620_readb calls sii8620_read_buf.
> sii8620_read_buf can return without setting its output
> pararmeter 'ret'.
>
> So initialize ret.
>
> Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")
>
> Signed-off-by: Tom Rix <trix@redhat.com>
Thnaks, applied to drm-misc-next as the fix is not urgent.
Sam
> ---
> drivers/gpu/drm/bridge/sil-sii8620.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
> index 3540e4931383..da933d477e5f 100644
> --- a/drivers/gpu/drm/bridge/sil-sii8620.c
> +++ b/drivers/gpu/drm/bridge/sil-sii8620.c
> @@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
>
> static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
> {
> - u8 ret;
> + u8 ret = 0;
>
> sii8620_read_buf(ctx, addr, &ret, 1);
> return ret;
> --
> 2.18.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-07-13 16:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200712152516eucas1p2cd883f7ccfcbfa78d452ba7a5641c363@eucas1p2.samsung.com>
2020-07-12 15:24 ` [PATCH] drm/bridge: sil_sii8620: initialize return of sii8620_readb trix
2020-07-12 15:24 ` trix
2020-07-12 15:34 ` Laurent Pinchart
2020-07-12 15:34 ` Laurent Pinchart
2020-07-13 15:29 ` Andrzej Hajda
2020-07-13 15:29 ` Andrzej Hajda
2020-07-13 16:00 ` Sam Ravnborg [this message]
2020-07-13 16:00 ` Sam Ravnborg
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