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[69.109.179.158]) by smtp.gmail.com with ESMTPSA id q7-20020acaf207000000b0037d7f4eb7e8sm726209oih.31.2023.04.06.07.40.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Apr 2023 07:40:35 -0700 (PDT) From: William Breathitt Gray To: Jonathan Cameron , Lars-Peter Clausen Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Andy Shevchenko , William Breathitt Gray Subject: [PATCH v5 3/6] iio: addac: stx104: Use define rather than hardcoded limit for write val Date: Thu, 6 Apr 2023 10:40:12 -0400 Message-Id: <4c9f4f1b4a270d133be70c82a091351b531b5e3e.1680790580.git.william.gray@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The DAC register is 16 bits wide, so the value passed by write_raw() should be checked against that limit. Rather than hardcoding the 16-bit maximum value limit, use a define to improve readability and make the intention of the code clearer. The explicit cast is also avoided by instead explicitly checking for negative values. Suggested-by: Andy Shevchenko Signed-off-by: William Breathitt Gray --- drivers/iio/addac/stx104.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/addac/stx104.c b/drivers/iio/addac/stx104.c index 8730b79e921c..0ed5f71b18cb 100644 --- a/drivers/iio/addac/stx104.c +++ b/drivers/iio/addac/stx104.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -181,8 +182,7 @@ static int stx104_write_raw(struct iio_dev *indio_dev, return 0; case IIO_CHAN_INFO_RAW: if (chan->output) { - /* DAC can only accept up to a 16-bit value */ - if ((unsigned int)val > 65535) + if (val < 0 || val > U16_MAX) return -EINVAL; mutex_lock(&priv->lock); -- 2.39.2