From 1781172526d1092323af443fa03f00e6de560401 Mon Sep 17 00:00:00 2001 From: Sergio Paracuellos Date: Fri, 26 Jun 2026 08:01:09 +0200 Subject: [PATCH] gpio: mt7621: avoid corruption of shared interrupt trigger state The bank-shared fields like 'rising' and 'falling' are modified using non-atomic read-modify-write operations. Since every gpio chip instance represents an entire bank of 32 pins, if 'mediatek_gpio_irq_type()' is called concurrently for different IRQs on the same bank a possible overwrite of each other's configuration is possible. Thus, protect this state with 'gpio_generic_lock_irqsave' lock in the same way it is handled in irp_chip 'mediatek_gpio_irq_mask()' and 'mediatek_gpio_irq_unmask()' callbacks. Cc: stable@vger.kernel.org Reported-by: Sashiko Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621") Signed-off-by: Sergio Paracuellos Link: https://patch.msgid.link/20260626060112.2498324-2-sergio.paracuellos@gmail.com Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpio-mt7621.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c index a814885ccd5d1..ceb99641baeeb 100644 --- a/drivers/gpio/gpio-mt7621.c +++ b/drivers/gpio/gpio-mt7621.c @@ -187,6 +187,8 @@ mediatek_gpio_irq_type(struct irq_data *d, unsigned int type) struct mtk_gc *rg = gpiochip_get_data(gc); u32 mask = BIT(mt7621_gpio_hwirq_to_offset(d->hwirq, rg)); + guard(gpio_generic_lock_irqsave)(&rg->chip); + if (type == IRQ_TYPE_PROBE) { if ((rg->rising | rg->falling | rg->hlevel | rg->llevel) & mask) -- 2.53.0