diff options
| author | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-10-18 11:10:12 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-10-22 08:59:08 +0200 |
| commit | 8c44447bd76109e33a69fccda89c84715fbd5658 (patch) | |
| tree | 164d045099419bbae988008985fc0c6da3683983 /drivers/gpio | |
| parent | gpio: cdev: go back to storing debounce period in the GPIO descriptor (diff) | |
| download | linux-8c44447bd76109e33a69fccda89c84715fbd5658.tar.xz linux-8c44447bd76109e33a69fccda89c84715fbd5658.zip | |
gpio: cdev: prepare gpio_desc_to_lineinfo() for being called from atomic
In order to prepare gpio_desc_to_lineinfo() to being called from atomic
context, add a new argument - bool atomic - which, if set, indicates
that no sleeping functions must be called (currently: only
pinctrl_gpio_can_use_line()).
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20241018-gpio-notify-in-kernel-events-v5-4-c79135e58a1c@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-cdev.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index d55d2a246d41..0cba74381687 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -2235,7 +2235,7 @@ static void gpio_v2_line_info_changed_to_v1( #endif /* CONFIG_GPIO_CDEV_V1 */ static void gpio_desc_to_lineinfo(struct gpio_desc *desc, - struct gpio_v2_line_info *info) + struct gpio_v2_line_info *info, bool atomic) { u32 debounce_period_us; unsigned long dflags; @@ -2277,9 +2277,12 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc, test_bit(FLAG_USED_AS_IRQ, &dflags) || test_bit(FLAG_EXPORT, &dflags) || test_bit(FLAG_SYSFS, &dflags) || - !gpiochip_line_is_valid(guard.gc, info->offset) || - !pinctrl_gpio_can_use_line(guard.gc, info->offset)) + !gpiochip_line_is_valid(guard.gc, info->offset)) { info->flags |= GPIO_V2_LINE_FLAG_USED; + } else if (!atomic) { + if (!pinctrl_gpio_can_use_line(guard.gc, info->offset)) + info->flags |= GPIO_V2_LINE_FLAG_USED; + } if (test_bit(FLAG_IS_OUT, &dflags)) info->flags |= GPIO_V2_LINE_FLAG_OUTPUT; @@ -2385,7 +2388,7 @@ static int lineinfo_get_v1(struct gpio_chardev_data *cdev, void __user *ip, return -EBUSY; } - gpio_desc_to_lineinfo(desc, &lineinfo_v2); + gpio_desc_to_lineinfo(desc, &lineinfo_v2, false); gpio_v2_line_info_to_v1(&lineinfo_v2, &lineinfo); if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) { @@ -2422,7 +2425,7 @@ static int lineinfo_get(struct gpio_chardev_data *cdev, void __user *ip, if (test_and_set_bit(lineinfo.offset, cdev->watched_lines)) return -EBUSY; } - gpio_desc_to_lineinfo(desc, &lineinfo); + gpio_desc_to_lineinfo(desc, &lineinfo, false); if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) { if (watch) @@ -2514,7 +2517,7 @@ static int lineinfo_changed_notify(struct notifier_block *nb, memset(&chg, 0, sizeof(chg)); chg.event_type = action; chg.timestamp_ns = ktime_get_ns(); - gpio_desc_to_lineinfo(desc, &chg.info); + gpio_desc_to_lineinfo(desc, &chg.info, false); ret = kfifo_in_spinlocked(&cdev->events, &chg, 1, &cdev->wait.lock); if (ret) |