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Message-Id: <20241018-gpio-notify-in-kernel-events-v5-4-c79135e58a1c@linaro.org>
Date: Fri, 18 Oct 2024 11:10:12 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>, Kent Gibson <warthog618@...il.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v5 4/8] gpio: cdev: prepare gpio_desc_to_lineinfo() for
being called from atomic
From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
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()).
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
drivers/gpio/gpiolib-cdev.c | 15 +++++++++------
1 file 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)
--
2.43.0
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