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[188.155.176.92]) by smtp.gmail.com with ESMTPSA id ce21-20020a170906b25500b006e89869cbf9sm5608802ejb.105.2022.04.19.04.34.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Apr 2022 04:34:58 -0700 (PDT) From: Krzysztof Kozlowski To: Greg Kroah-Hartman , "Rafael J. Wysocki" Cc: Stuart Yoder , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Helgaas , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Gross , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, NXP Linux Team , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-spi@vger.kernel.org, virtualization@lists.linux-foundation.org, Linus Torvalds , Rasmus Villemoes , Andy Shevchenko , Krzysztof Kozlowski , Mark Brown Subject: [PATCH v7 07/12] spi: Use helper for safer setting of driver_override Date: Tue, 19 Apr 2022 13:34:30 +0200 Message-Id: <20220419113435.246203-8-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220419113435.246203-1-krzysztof.kozlowski@linaro.org> References: <20220419113435.246203-1-krzysztof.kozlowski@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Use a helper to set driver_override to the reduce amount of duplicated code. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Mark Brown --- drivers/spi/spi.c | 26 ++++---------------------- include/linux/spi/spi.h | 2 ++ 2 files changed, 6 insertions(+), 22 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 890ff46c784a..be8f1a1e21b2 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -71,29 +71,11 @@ static ssize_t driver_override_store(struct device *dev, const char *buf, size_t count) { struct spi_device *spi = to_spi_device(dev); - const char *end = memchr(buf, '\n', count); - const size_t len = end ? end - buf : count; - const char *driver_override, *old; - - /* We need to keep extra room for a newline when displaying value */ - if (len >= (PAGE_SIZE - 1)) - return -EINVAL; - - driver_override = kstrndup(buf, len, GFP_KERNEL); - if (!driver_override) - return -ENOMEM; + int ret; - device_lock(dev); - old = spi->driver_override; - if (len) { - spi->driver_override = driver_override; - } else { - /* Empty string, disable driver override */ - spi->driver_override = NULL; - kfree(driver_override); - } - device_unlock(dev); - kfree(old); + ret = driver_set_override(dev, &spi->driver_override, buf, count); + if (ret) + return ret; return count; } diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 5f8c063ddff4..f0177f9b6e13 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -138,6 +138,8 @@ extern int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer); * for driver coldplugging, and in uevents used for hotplugging * @driver_override: If the name of a driver is written to this attribute, then * the device will bind to the named driver and only the named driver. + * Do not set directly, because core frees it; use driver_set_override() to + * set or clear it. * @cs_gpiod: gpio descriptor of the chipselect line (optional, NULL when * not using a GPIO line) * @word_delay: delay to be inserted between consecutive