From: Kent Gibson <warthog618@gmail.com>
To: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
bgolaszewski@baylibre.com, linus.walleij@linaro.org
Cc: Kent Gibson <warthog618@gmail.com>
Subject: [PATCH 11/22] gpiolib: cdev: remove recalculation of offset
Date: Tue, 23 Jun 2020 12:00:56 +0800 [thread overview]
Message-ID: <20200623040107.22270-12-warthog618@gmail.com> (raw)
In-Reply-To: <20200623040107.22270-1-warthog618@gmail.com>
Remove recalculation of offset from desc, where desc itself was calculated
from offset.
There is no benefit from for 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 <warthog618@gmail.com>
---
drivers/gpio/gpiolib-cdev.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index a727709b24a9..b6878fc87dfc 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -834,7 +834,6 @@ 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)
@@ -862,12 +861,11 @@ 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)))
@@ -883,13 +881,12 @@ 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, gcdev->watched_lines))
+ if (test_and_set_bit(lineinfo.line_offset, gcdev->watched_lines))
return -EBUSY;
gpio_desc_to_lineinfo(desc, &lineinfo);
@@ -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 >= gcdev->gdev->ngpio)
+ return -EINVAL;
- if (!test_and_clear_bit(hwgpio, gcdev->watched_lines))
+ if (!test_and_clear_bit(offset, gcdev->watched_lines))
return -EBUSY;
return 0;
--
2.27.0
next prev parent reply other threads:[~2020-06-23 4:02 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 4:00 [PATCH 00/22] gpio: cdev: add uAPI V2 Kent Gibson
2020-06-23 4:00 ` [PATCH 01/22] gpiolib: move gpiolib-sysfs function declarations into their own header Kent Gibson
2020-06-24 13:34 ` Bartosz Golaszewski
2020-06-24 13:38 ` Kent Gibson
2020-06-23 4:00 ` [PATCH 02/22] gpiolib: cdev: sort includes Kent Gibson
2020-06-24 13:34 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 03/22] gpiolib: cdev: minor indentation fixes Kent Gibson
2020-06-24 13:35 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 04/22] gpiolib: cdev: refactor gpiohandle_flags_to_desc_flags Kent Gibson
2020-06-24 13:51 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 05/22] gpiolib: cdev: rename 'filep' and 'filp' to 'file' to be consistent with other use Kent Gibson
2020-06-24 13:52 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 06/22] gpiolib: cdev: rename numdescs to num_descs Kent Gibson
2020-06-24 13:53 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 07/22] gpiolib: cdev: remove pointless decrement of i Kent Gibson
2020-06-24 13:53 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 08/22] gpiolib: cdev: complete the irq/thread timestamp handshake Kent Gibson
2020-06-24 14:00 ` Bartosz Golaszewski
2020-06-24 14:08 ` Kent Gibson
2020-06-25 9:44 ` Bartosz Golaszewski
2020-06-25 10:01 ` Kent Gibson
2020-06-30 9:08 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 09/22] gpiolib: cdev: rename priv to gcdev Kent Gibson
2020-06-24 14:04 ` Bartosz Golaszewski
2020-06-24 14:19 ` Kent Gibson
2020-06-24 14:20 ` Bartosz Golaszewski
2020-06-24 23:16 ` Kent Gibson
2020-06-25 10:26 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 10/22] gpiolib: cdev: fix minor race in GET_LINEINFO_WATCH Kent Gibson
2020-06-24 14:05 ` Bartosz Golaszewski
2020-06-24 14:46 ` Andy Shevchenko
2020-06-24 15:57 ` Kent Gibson
2020-06-24 22:58 ` Kent Gibson
2020-06-25 8:44 ` Andy Shevchenko
2020-06-25 9:13 ` Kent Gibson
2020-06-25 9:23 ` Andy Shevchenko
2020-06-25 9:36 ` Kent Gibson
2020-06-23 4:00 ` Kent Gibson [this message]
2020-06-30 8:56 ` [PATCH 11/22] gpiolib: cdev: remove recalculation of offset Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 12/22] gpio: uapi: define GPIO_MAX_NAME_SIZE for array sizes Kent Gibson
2020-06-24 14:13 ` Bartosz Golaszewski
2020-06-23 4:00 ` [PATCH 13/22] gpio: uapi: define uAPI V2 Kent Gibson
2020-06-24 14:33 ` Andy Shevchenko
2020-06-24 15:40 ` Kent Gibson
2020-06-26 14:02 ` Kent Gibson
2020-06-24 14:36 ` Bartosz Golaszewski
2020-06-24 23:58 ` Kent Gibson
2020-06-23 4:00 ` [PATCH 14/22] gpiolib: make cdev a build option Kent Gibson
2020-06-29 14:25 ` Bartosz Golaszewski
2020-06-23 4:01 ` [PATCH 15/22] gpiolib: add build option for CDEV V1 ABI Kent Gibson
2020-06-29 14:26 ` Bartosz Golaszewski
2020-06-23 4:01 ` [PATCH 16/22] gpiolib: cdev: add V2 uAPI implementation to parity with V1 Kent Gibson
2020-06-23 17:44 ` Dan Carpenter
2020-06-23 23:23 ` Kent Gibson
2020-06-23 4:01 ` [PATCH 17/22] gpiolib: cdev: report edge detection in lineinfo Kent Gibson
2020-06-23 4:01 ` [PATCH 18/22] gpiolib: cdev: support setting debounce Kent Gibson
2020-06-23 4:01 ` [PATCH 19/22] gpio: uapi: document uAPI V1 as deprecated Kent Gibson
2020-06-23 4:01 ` [PATCH 20/22] tools: gpio: switch tools to V2 uAPI Kent Gibson
2020-06-23 4:01 ` [PATCH 21/22] tools: gpio: add debounce support to gpio-event-mon Kent Gibson
2020-06-23 4:01 ` [PATCH 22/22] tools: gpio: support monitoring multiple lines Kent Gibson
2020-06-30 10:43 ` Bartosz Golaszewski
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