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[106.69.191.222]) by smtp.gmail.com with ESMTPSA id gx23sm3821951pjb.39.2020.07.07.21.20.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2020 21:20:04 -0700 (PDT) From: Kent Gibson To: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com, linus.walleij@linaro.org Cc: Kent Gibson Subject: [PATCH 11/17] gpiolib: cdev: remove recalculation of offset Date: Wed, 8 Jul 2020 12:15:54 +0800 Message-Id: <20200708041600.768775-12-warthog618@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200708041600.768775-1-warthog618@gmail.com> References: <20200708041600.768775-1-warthog618@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Remove recalculation of offset from desc, where desc itself was calculated from offset. There is no benefit from the desc -> hwgpio conversion in this context. The only implicit benefit of the offset -> desc -> hwgpio is the range check in the offset -> desc, but where desc is required you still get that, and where desc isn't required it is simpler to perform the range check directly. Signed-off-by: Kent Gibson --- drivers/gpio/gpiolib-cdev.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index b2b26dc25051..c86fb9305681 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -832,7 +832,6 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) void __user *ip = (void __user *)arg; struct gpio_desc *desc; __u32 offset; - int hwgpio; /* We fail any subsequent ioctl():s when the chip is gone */ if (!gc) @@ -860,12 +859,11 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) return -EFAULT; + /* this doubles as a range check on line_offset */ desc = gpiochip_get_desc(gc, lineinfo.line_offset); if (IS_ERR(desc)) return PTR_ERR(desc); - hwgpio = gpio_chip_hwgpio(desc); - gpio_desc_to_lineinfo(desc, &lineinfo); if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) @@ -881,19 +879,18 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) return -EFAULT; + /* this doubles as a range check on line_offset */ desc = gpiochip_get_desc(gc, lineinfo.line_offset); if (IS_ERR(desc)) return PTR_ERR(desc); - hwgpio = gpio_chip_hwgpio(desc); - - if (test_and_set_bit(hwgpio, cdev->watched_lines)) + if (test_and_set_bit(lineinfo.line_offset, cdev->watched_lines)) return -EBUSY; gpio_desc_to_lineinfo(desc, &lineinfo); if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) { - clear_bit(hwgpio, cdev->watched_lines); + clear_bit(lineinfo.line_offset, cdev->watched_lines); return -EFAULT; } @@ -902,13 +899,10 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (copy_from_user(&offset, ip, sizeof(offset))) return -EFAULT; - desc = gpiochip_get_desc(gc, offset); - if (IS_ERR(desc)) - return PTR_ERR(desc); - - hwgpio = gpio_chip_hwgpio(desc); + if (offset >= cdev->gdev->ngpio) + return -EINVAL; - if (!test_and_clear_bit(hwgpio, cdev->watched_lines)) + if (!test_and_clear_bit(offset, cdev->watched_lines)) return -EBUSY; return 0; -- 2.27.0