diff options
| author | Haotian Zhang <vulab@iscas.ac.cn> | 2025-10-23 10:02:30 +0300 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2025-10-23 15:30:11 +0300 |
| commit | 4c4e6ea4a120cc5ab58e437c6ba123cbfc357d45 (patch) | |
| tree | 60a14efba27c44e8658ac95faacff17528894a9d | |
| parent | 5f4bfd03bc9deec480bf9f8cb37e63e590fd8212 (diff) | |
| download | linux-4c4e6ea4a120cc5ab58e437c6ba123cbfc357d45.tar.xz | |
gpio: ljca: Fix duplicated IRQ mapping
The generic_handle_domain_irq() function resolves the hardware IRQ
internally. The driver performed a duplicative mapping by calling
irq_find_mapping() first, which could lead to an RCU stall.
Delete the redundant irq_find_mapping() call and pass the hardware IRQ
directly to generic_handle_domain_irq().
Fixes: c5a4b6fd31e8 ("gpio: Add support for Intel LJCA USB GPIO driver")
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/r/20251023070231.1305-1-vulab@iscas.ac.cn
[Bartosz: remove unused variable]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-ljca.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/drivers/gpio/gpio-ljca.c b/drivers/gpio/gpio-ljca.c index 3b4f8830c741..f32d1d237795 100644 --- a/drivers/gpio/gpio-ljca.c +++ b/drivers/gpio/gpio-ljca.c @@ -286,22 +286,14 @@ static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data, { const struct ljca_gpio_packet *packet = evt_data; struct ljca_gpio_dev *ljca_gpio = context; - int i, irq; + int i; if (cmd != LJCA_GPIO_INT_EVENT) return; for (i = 0; i < packet->num; i++) { - irq = irq_find_mapping(ljca_gpio->gc.irq.domain, - packet->item[i].index); - if (!irq) { - dev_err(ljca_gpio->gc.parent, - "gpio_id %u does not mapped to IRQ yet\n", - packet->item[i].index); - return; - } - - generic_handle_domain_irq(ljca_gpio->gc.irq.domain, irq); + generic_handle_domain_irq(ljca_gpio->gc.irq.domain, + packet->item[i].index); set_bit(packet->item[i].index, ljca_gpio->reenable_irqs); } |