From: Nathan Chancellor <natechancellor@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Jonathan Cameron <jic23@kernel.org>,
clang-built-linux@googlegroups.com,
Nick Desaulniers <ndesaulniers@google.com>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Max Krummenacher <max.krummenacher@toradex.com>,
Lee Jones <lee.jones@linaro.org>, Stefan Agner <stefan@agner.ch>,
linux-iio@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iio: stmpe-adc: avoid harmless clang warning
Date: Fri, 22 Mar 2019 07:58:28 -0700 [thread overview]
Message-ID: <20190322145828.GB6521@archlinux-ryzen> (raw)
In-Reply-To: <20190322140906.319267-1-arnd@arndb.de>
On Fri, Mar 22, 2019 at 03:08:39PM +0100, Arnd Bergmann wrote:
> Clang points out a control flow bug, which happens to be harmless:
>
> drivers/iio/adc/stmpe-adc.c:204:13: error: variable 'data' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
>
> The warning is sensible here, so let's just avoid the case by
> adding appropriate error handling.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> drivers/iio/adc/stmpe-adc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
> index 37f4b74a5d32..ed3817c5c896 100644
> --- a/drivers/iio/adc/stmpe-adc.c
> +++ b/drivers/iio/adc/stmpe-adc.c
> @@ -205,6 +205,8 @@ static irqreturn_t stmpe_adc_isr(int irq, void *dev_id)
> /* Read value */
> stmpe_block_read(info->stmpe, STMPE_REG_TEMP_DATA, 2,
> (u8 *) &data);
> + } else {
> + return IRQ_NONE;
> }
>
> info->value = (u32) be16_to_cpu(data);
> --
> 2.20.0
>
I sent a similar patch, which is sitting in Jonathan's testing branch:
https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?id=e15146e4d4349b3f309f5591ea8de8d24071265f
Nathan
next prev parent reply other threads:[~2019-03-22 14:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 14:08 [PATCH] iio: stmpe-adc: avoid harmless clang warning Arnd Bergmann
2019-03-22 14:58 ` Nathan Chancellor [this message]
2019-03-22 15:09 ` Arnd Bergmann
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