drivers/pinctrl/renesas/pinctrl-rzt2h.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
The following invalid wait context BUG is observed when running with
CONFIG_PROVE_LOCKING enabled.
This seems to stem from the fact that __setup_irq() takes a
raw_spinlock_t, while we take a spinlock_t inside gpiod_get_direction().
raw_spinlock_t is a strictly spinning lock, while spinlock_t can sleep
if PREEMPT_RT is enabled.
Switch to raw_spinlock_t to fix this.
[ 20.641809] =============================
[ 20.646336] [ BUG: Invalid wait context ]
[ 20.650964] 6.19.0-rc8-next-20260202+ #417 Not tainted
[ 20.656892] -----------------------------
[ 20.661517] (udev-worker)/235 is trying to lock:
[ 20.666842] ffff000182d4ab58 (&pctrl->lock){....}-{3:3}, at: rzt2h_gpio_get_direction+0x3c/0x150
[ 20.676928] other info that might help us debug this:
[ 20.682560] context-{5:5}
[ 20.685572] 4 locks held by (udev-worker)/235:
[ 20.690701] #0: ffff000180b398f8 (&dev->mutex){....}-{4:4}, at: __driver_attach+0x10c/0x210
[ 20.700480] #1: ffff000186f41a60 (request_class){+.+.}-{4:4}, at: __setup_irq+0x10c/0x740
[ 20.709952] #2: ffff000186f418c8 (lock_class){....}-{2:2}, at: __setup_irq+0x12c/0x740
[ 20.719057] #3: ffff000182d4a690 (&gdev->srcu){.+.+}-{0:0}, at: gpiod_get_direction+0x40/0x24c
[ 20.729135] stack backtrace:
[ 20.732450] CPU: 2 UID: 0 PID: 235 Comm: (udev-worker) Not tainted 6.19.0-rc8-next-20260202+ #417 PREEMPT
[ 20.732459] Hardware name: Renesas RZ/T2H EVK Board based on r9a09g077m44 (DT)
[ 20.732464] Call trace:
[ 20.732467] show_stack+0x18/0x30 (C)
[ 20.732479] dump_stack_lvl+0x70/0x98
[ 20.732489] dump_stack+0x18/0x24
[ 20.732497] __lock_acquire+0x910/0x1594
[ 20.732508] lock_acquire+0x2f0/0x42c
[ 20.732517] _raw_spin_lock_irqsave+0x5c/0x94
[ 20.732529] rzt2h_gpio_get_direction+0x3c/0x150
[ 20.732538] gpiochip_get_direction+0x34/0x90
[ 20.732547] gpiod_get_direction+0xd8/0x24c
[ 20.732556] gpiochip_lock_as_irq+0x68/0x144
[ 20.732565] gpiochip_irq_domain_activate+0x18/0x30
[ 20.732574] __irq_domain_activate_irq+0x60/0xb0
[ 20.732583] irq_domain_activate_irq+0x34/0x5c
[ 20.732593] irq_activate+0x2c/0x38
[ 20.732600] __setup_irq+0x2d8/0x740
[ 20.732610] request_threaded_irq+0xb0/0x180
[ 20.732620] request_any_context_irq+0x58/0xac
[ 20.732629] devm_request_any_context_irq+0x78/0x160
[ 20.732637] gpio_keys_probe+0x344/0xb40 [gpio_keys]
[ 20.732657] platform_probe+0x5c/0xa4
[ 20.732666] really_probe+0xbc/0x2ac
[ 20.732675] __driver_probe_device+0x78/0x118
[ 20.732684] driver_probe_device+0x3c/0x170
[ 20.732693] __driver_attach+0x118/0x210
[ 20.732701] bus_for_each_dev+0x7c/0xdc
[ 20.732710] driver_attach+0x24/0x3c
[ 20.732718] bus_add_driver+0xe4/0x204
[ 20.732727] driver_register+0x68/0x124
[ 20.732736] __platform_driver_register+0x20/0x2c
[ 20.732746] gpio_keys_init+0x20/0x1000 [gpio_keys]
[ 20.732758] do_one_initcall+0x7c/0x530
[ 20.732770] do_init_module+0x54/0x23c
[ 20.732780] load_module+0x181c/0x1ed0
[ 20.732789] init_module_from_file+0xd8/0xfc
[ 20.732797] idempotent_init_module+0x1e0/0x2d0
[ 20.732806] __arm64_sys_finit_module+0x60/0xa4
[ 20.732814] invoke_syscall.constprop.0+0x40/0xf0
[ 20.732824] el0_svc_common.constprop.0+0xb8/0xd8
[ 20.732832] do_el0_svc+0x1c/0x28
[ 20.732839] el0_svc+0x4c/0x2dc
[ 20.732850] el0t_64_sync_handler+0xa0/0xe4
[ 20.732860] el0t_64_sync+0x198/0x19c
Fixes: 829dde3369a9 ("pinctrl: renesas: rzt2h: Add GPIO IRQ chip to handle interrupts")
Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
---
drivers/pinctrl/renesas/pinctrl-rzt2h.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/pinctrl/renesas/pinctrl-rzt2h.c b/drivers/pinctrl/renesas/pinctrl-rzt2h.c
index 9949108a35bb..d810dc0dae95 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzt2h.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzt2h.c
@@ -85,7 +85,7 @@ struct rzt2h_pinctrl {
struct gpio_chip gpio_chip;
struct pinctrl_gpio_range gpio_range;
DECLARE_BITMAP(used_irqs, RZT2H_INTERRUPTS_NUM);
- spinlock_t lock; /* lock read/write registers */
+ raw_spinlock_t lock; /* lock read/write registers */
struct mutex mutex; /* serialize adding groups and functions */
bool safety_port_enabled;
atomic_t wakeup_path;
@@ -145,7 +145,7 @@ static void rzt2h_pinctrl_set_pfc_mode(struct rzt2h_pinctrl *pctrl,
u64 reg64;
u16 reg16;
- guard(spinlock_irqsave)(&pctrl->lock);
+ guard(raw_spinlock_irqsave)(&pctrl->lock);
/* Set pin to 'Non-use (Hi-Z input protection)' */
reg16 = rzt2h_pinctrl_readw(pctrl, port, PM(port));
@@ -474,7 +474,7 @@ static int rzt2h_gpio_request(struct gpio_chip *chip, unsigned int offset)
if (ret)
return ret;
- guard(spinlock_irqsave)(&pctrl->lock);
+ guard(raw_spinlock_irqsave)(&pctrl->lock);
/* Select GPIO mode in PMC Register */
rzt2h_pinctrl_set_gpio_en(pctrl, port, bit, true);
@@ -487,7 +487,7 @@ static void rzt2h_gpio_set_direction(struct rzt2h_pinctrl *pctrl, u32 port,
{
u16 reg;
- guard(spinlock_irqsave)(&pctrl->lock);
+ guard(raw_spinlock_irqsave)(&pctrl->lock);
reg = rzt2h_pinctrl_readw(pctrl, port, PM(port));
reg &= ~PM_PIN_MASK(bit);
@@ -509,7 +509,7 @@ static int rzt2h_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
if (ret)
return ret;
- guard(spinlock_irqsave)(&pctrl->lock);
+ guard(raw_spinlock_irqsave)(&pctrl->lock);
if (rzt2h_pinctrl_readb(pctrl, port, PMC(port)) & BIT(bit)) {
/*
@@ -547,7 +547,7 @@ static int rzt2h_gpio_set(struct gpio_chip *chip, unsigned int offset,
u8 bit = RZT2H_PIN_ID_TO_PIN(offset);
u8 reg;
- guard(spinlock_irqsave)(&pctrl->lock);
+ guard(raw_spinlock_irqsave)(&pctrl->lock);
reg = rzt2h_pinctrl_readb(pctrl, port, P(port));
if (value)
@@ -964,7 +964,7 @@ static int rzt2h_pinctrl_probe(struct platform_device *pdev)
if (ret)
return ret;
- spin_lock_init(&pctrl->lock);
+ raw_spin_lock_init(&pctrl->lock);
mutex_init(&pctrl->mutex);
platform_set_drvdata(pdev, pctrl);
--
2.52.0On 2026-02-04 20:04:48 [+0200], Cosmin Tanislav wrote:
> The following invalid wait context BUG is observed when running with
> CONFIG_PROVE_LOCKING enabled.
>
> This seems to stem from the fact that __setup_irq() takes a
> raw_spinlock_t, while we take a spinlock_t inside gpiod_get_direction().
From the backtrace yes. It is more that the irqchip used interrupt chip
needs to be able to mask interrupts in hardirq context which it needs a
raw_spinlock_t.
> raw_spinlock_t is a strictly spinning lock, while spinlock_t can sleep
> if PREEMPT_RT is enabled.
>
> Switch to raw_spinlock_t to fix this.
>
> [ 20.641809] =============================
> [ 20.646336] [ BUG: Invalid wait context ]
> [ 20.650964] 6.19.0-rc8-next-20260202+ #417 Not tainted
> [ 20.656892] -----------------------------
> [ 20.661517] (udev-worker)/235 is trying to lock:
> [ 20.666842] ffff000182d4ab58 (&pctrl->lock){....}-{3:3}, at: rzt2h_gpio_get_direction+0x3c/0x150
> [ 20.676928] other info that might help us debug this:
> [ 20.682560] context-{5:5}
> [ 20.685572] 4 locks held by (udev-worker)/235:
> [ 20.690701] #0: ffff000180b398f8 (&dev->mutex){....}-{4:4}, at: __driver_attach+0x10c/0x210
> [ 20.700480] #1: ffff000186f41a60 (request_class){+.+.}-{4:4}, at: __setup_irq+0x10c/0x740
> [ 20.709952] #2: ffff000186f418c8 (lock_class){....}-{2:2}, at: __setup_irq+0x12c/0x740
> [ 20.719057] #3: ffff000182d4a690 (&gdev->srcu){.+.+}-{0:0}, at: gpiod_get_direction+0x40/0x24c
> [ 20.729135] stack backtrace:
> [ 20.732450] CPU: 2 UID: 0 PID: 235 Comm: (udev-worker) Not tainted 6.19.0-rc8-next-20260202+ #417 PREEMPT
> [ 20.732459] Hardware name: Renesas RZ/T2H EVK Board based on r9a09g077m44 (DT)
> [ 20.732464] Call trace:
> [ 20.732467] show_stack+0x18/0x30 (C)
> [ 20.732479] dump_stack_lvl+0x70/0x98
> [ 20.732489] dump_stack+0x18/0x24
> [ 20.732497] __lock_acquire+0x910/0x1594
> [ 20.732508] lock_acquire+0x2f0/0x42c
> [ 20.732517] _raw_spin_lock_irqsave+0x5c/0x94
> [ 20.732529] rzt2h_gpio_get_direction+0x3c/0x150
> [ 20.732538] gpiochip_get_direction+0x34/0x90
> [ 20.732547] gpiod_get_direction+0xd8/0x24c
> [ 20.732556] gpiochip_lock_as_irq+0x68/0x144
> [ 20.732565] gpiochip_irq_domain_activate+0x18/0x30
> [ 20.732574] __irq_domain_activate_irq+0x60/0xb0
> [ 20.732583] irq_domain_activate_irq+0x34/0x5c
> [ 20.732593] irq_activate+0x2c/0x38
> [ 20.732600] __setup_irq+0x2d8/0x740
> [ 20.732610] request_threaded_irq+0xb0/0x180
> [ 20.732620] request_any_context_irq+0x58/0xac
> [ 20.732629] devm_request_any_context_irq+0x78/0x160
> [ 20.732637] gpio_keys_probe+0x344/0xb40 [gpio_keys]
> [ 20.732657] platform_probe+0x5c/0xa4
> [ 20.732666] really_probe+0xbc/0x2ac
> [ 20.732675] __driver_probe_device+0x78/0x118
> [ 20.732684] driver_probe_device+0x3c/0x170
> [ 20.732693] __driver_attach+0x118/0x210
> [ 20.732701] bus_for_each_dev+0x7c/0xdc
> [ 20.732710] driver_attach+0x24/0x3c
> [ 20.732718] bus_add_driver+0xe4/0x204
> [ 20.732727] driver_register+0x68/0x124
> [ 20.732736] __platform_driver_register+0x20/0x2c
> [ 20.732746] gpio_keys_init+0x20/0x1000 [gpio_keys]
> [ 20.732758] do_one_initcall+0x7c/0x530
> [ 20.732770] do_init_module+0x54/0x23c
> [ 20.732780] load_module+0x181c/0x1ed0
> [ 20.732789] init_module_from_file+0xd8/0xfc
> [ 20.732797] idempotent_init_module+0x1e0/0x2d0
> [ 20.732806] __arm64_sys_finit_module+0x60/0xa4
> [ 20.732814] invoke_syscall.constprop.0+0x40/0xf0
> [ 20.732824] el0_svc_common.constprop.0+0xb8/0xd8
> [ 20.732832] do_el0_svc+0x1c/0x28
> [ 20.732839] el0_svc+0x4c/0x2dc
> [ 20.732850] el0t_64_sync_handler+0xa0/0xe4
> [ 20.732860] el0t_64_sync+0x198/0x19c
Please get rid of this backtrace. It adds no value to the description.
> Fixes: 829dde3369a9 ("pinctrl: renesas: rzt2h: Add GPIO IRQ chip to handle interrupts")
> Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Sebastian
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