From: Neil Armstrong <narmstrong@baylibre.com>
To: Nathan Chancellor <natechancellor@gmail.com>,
Felipe Balbi <balbi@kernel.org>
Cc: Hanjie Lin <hanjie.lin@amlogic.com>,
kbuild test robot <lkp@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Yue Wang <yue.wang@amlogic.com>,
clang-built-linux@googlegroups.com,
Kevin Hilman <khilman@baylibre.com>,
linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] usb: dwc3: meson-g12a: Don't use ret uninitialized in dwc3_meson_g12a_otg_init
Date: Wed, 19 Feb 2020 15:14:06 +0100 [thread overview]
Message-ID: <d47c9cb2-9458-afc7-e91b-1a56ad87d1be@baylibre.com> (raw)
In-Reply-To: <20200210225816.36598-1-natechancellor@gmail.com>
On 10/02/2020 23:58, Nathan Chancellor wrote:
> Clang warns:
>
> ../drivers/usb/dwc3/dwc3-meson-g12a.c:421:6: warning: variable 'ret' is
> used uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
> if (priv->otg_mode == USB_DR_MODE_OTG) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/usb/dwc3/dwc3-meson-g12a.c:455:9: note: uninitialized use
> occurs here
> return ret;
> ^~~
> ../drivers/usb/dwc3/dwc3-meson-g12a.c:421:2: note: remove the 'if' if
> its condition is always true
> if (priv->otg_mode == USB_DR_MODE_OTG) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/usb/dwc3/dwc3-meson-g12a.c:415:9: note: initialize the
> variable 'ret' to silence this warning
> int ret, irq;
> ^
> = 0
> 1 warning generated.
>
> It is not wrong, ret is only used when that if statement is true. Just
> directly return 0 at the end to avoid this.
>
> Fixes: 729149c53f04 ("usb: dwc3: Add Amlogic A1 DWC3 glue")
> Reported-by: kbuild test robot <lkp@intel.com>
> Link: https://groups.google.com/d/msg/clang-built-linux/w5iBENco_m4/PPuXreAxBQAJ
> Link: https://github.com/ClangBuiltLinux/linux/issues/869
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> ---
>
> Note: This patch is against Felipe's testing/next branch.
>
> drivers/usb/dwc3/dwc3-meson-g12a.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
> index 70d24b98fcad..902553f39889 100644
> --- a/drivers/usb/dwc3/dwc3-meson-g12a.c
> +++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
> @@ -452,7 +452,7 @@ static int dwc3_meson_g12a_otg_init(struct platform_device *pdev,
> if (IS_ERR(priv->role_switch))
> dev_warn(dev, "Unable to register Role Switch\n");
>
> - return ret;
> + return 0;
> }
>
> static int dwc3_meson_g12a_probe(struct platform_device *pdev)
>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
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next prev parent reply other threads:[~2020-02-19 14:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 22:58 [PATCH] usb: dwc3: meson-g12a: Don't use ret uninitialized in dwc3_meson_g12a_otg_init Nathan Chancellor
2020-02-19 14:14 ` Neil Armstrong [this message]
2020-04-16 16:08 ` patchwork-bot+linux-amlogic
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