5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sean Anderson sean.anderson@linux.dev
[ Upstream commit 9860370c2172704b6b4f0075a0c2a29fd84af96a ]
irq_chip functions may be called in raw spinlock context. Therefore, we must also use a raw spinlock for our own internal locking.
This fixes the following lockdep splat:
[ 5.349336] ============================= [ 5.353349] [ BUG: Invalid wait context ] [ 5.357361] 6.13.0-rc5+ #69 Tainted: G W [ 5.363031] ----------------------------- [ 5.367045] kworker/u17:1/44 is trying to lock: [ 5.371587] ffffff88018b02c0 (&chip->gpio_lock){....}-{3:3}, at: xgpio_irq_unmask (drivers/gpio/gpio-xilinx.c:433 (discriminator 8)) [ 5.380079] other info that might help us debug this: [ 5.385138] context-{5:5} [ 5.387762] 5 locks held by kworker/u17:1/44: [ 5.392123] #0: ffffff8800014958 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3204) [ 5.402260] #1: ffffffc082fcbdd8 (deferred_probe_work){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3205) [ 5.411528] #2: ffffff880172c900 (&dev->mutex){....}-{4:4}, at: __device_attach (drivers/base/dd.c:1006) [ 5.419929] #3: ffffff88039c8268 (request_class#2){+.+.}-{4:4}, at: __setup_irq (kernel/irq/internals.h:156 kernel/irq/manage.c:1596) [ 5.428331] #4: ffffff88039c80c8 (lock_class#2){....}-{2:2}, at: __setup_irq (kernel/irq/manage.c:1614) [ 5.436472] stack backtrace: [ 5.439359] CPU: 2 UID: 0 PID: 44 Comm: kworker/u17:1 Tainted: G W 6.13.0-rc5+ #69 [ 5.448690] Tainted: [W]=WARN [ 5.451656] Hardware name: xlnx,zynqmp (DT) [ 5.455845] Workqueue: events_unbound deferred_probe_work_func [ 5.461699] Call trace: [ 5.464147] show_stack+0x18/0x24 C [ 5.467821] dump_stack_lvl (lib/dump_stack.c:123) [ 5.471501] dump_stack (lib/dump_stack.c:130) [ 5.474824] __lock_acquire (kernel/locking/lockdep.c:4828 kernel/locking/lockdep.c:4898 kernel/locking/lockdep.c:5176) [ 5.478758] lock_acquire (arch/arm64/include/asm/percpu.h:40 kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851 kernel/locking/lockdep.c:5814) [ 5.482429] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 5.486797] xgpio_irq_unmask (drivers/gpio/gpio-xilinx.c:433 (discriminator 8)) [ 5.490737] irq_enable (kernel/irq/internals.h:236 kernel/irq/chip.c:170 kernel/irq/chip.c:439 kernel/irq/chip.c:432 kernel/irq/chip.c:345) [ 5.494060] __irq_startup (kernel/irq/internals.h:241 kernel/irq/chip.c:180 kernel/irq/chip.c:250) [ 5.497645] irq_startup (kernel/irq/chip.c:270) [ 5.501143] __setup_irq (kernel/irq/manage.c:1807) [ 5.504728] request_threaded_irq (kernel/irq/manage.c:2208)
Fixes: a32c7caea292 ("gpio: gpio-xilinx: Add interrupt support") Signed-off-by: Sean Anderson sean.anderson@linux.dev Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20250110163354.2012654-1-sean.anderson@linux.dev Signed-off-by: Bartosz Golaszewski bartosz.golaszewski@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpio/gpio-xilinx.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index 067ac1805853c..908730d8dc955 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -66,7 +66,7 @@ struct xgpio_instance { DECLARE_BITMAP(state, 64); DECLARE_BITMAP(last_irq_read, 64); DECLARE_BITMAP(dir, 64); - spinlock_t gpio_lock; /* For serializing operations */ + raw_spinlock_t gpio_lock; /* For serializing operations */ int irq; DECLARE_BITMAP(enable, 64); DECLARE_BITMAP(rising_edge, 64); @@ -178,14 +178,14 @@ static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) struct xgpio_instance *chip = gpiochip_get_data(gc); int bit = xgpio_to_bit(chip, gpio);
- spin_lock_irqsave(&chip->gpio_lock, flags); + raw_spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write to GPIO signal and set its direction to output */ __assign_bit(bit, chip->state, val);
xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, chip->state);
- spin_unlock_irqrestore(&chip->gpio_lock, flags); + raw_spin_unlock_irqrestore(&chip->gpio_lock, flags); }
/** @@ -209,7 +209,7 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, bitmap_remap(hw_mask, mask, chip->sw_map, chip->hw_map, 64); bitmap_remap(hw_bits, bits, chip->sw_map, chip->hw_map, 64);
- spin_lock_irqsave(&chip->gpio_lock, flags); + raw_spin_lock_irqsave(&chip->gpio_lock, flags);
bitmap_replace(state, chip->state, hw_bits, hw_mask, 64);
@@ -217,7 +217,7 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
bitmap_copy(chip->state, state, 64);
- spin_unlock_irqrestore(&chip->gpio_lock, flags); + raw_spin_unlock_irqrestore(&chip->gpio_lock, flags); }
/** @@ -235,13 +235,13 @@ static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) struct xgpio_instance *chip = gpiochip_get_data(gc); int bit = xgpio_to_bit(chip, gpio);
- spin_lock_irqsave(&chip->gpio_lock, flags); + raw_spin_lock_irqsave(&chip->gpio_lock, flags);
/* Set the GPIO bit in shadow register and set direction as input */ __set_bit(bit, chip->dir); xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, chip->dir);
- spin_unlock_irqrestore(&chip->gpio_lock, flags); + raw_spin_unlock_irqrestore(&chip->gpio_lock, flags);
return 0; } @@ -264,7 +264,7 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) struct xgpio_instance *chip = gpiochip_get_data(gc); int bit = xgpio_to_bit(chip, gpio);
- spin_lock_irqsave(&chip->gpio_lock, flags); + raw_spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write state of GPIO signal */ __assign_bit(bit, chip->state, val); @@ -274,7 +274,7 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) __clear_bit(bit, chip->dir); xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, chip->dir);
- spin_unlock_irqrestore(&chip->gpio_lock, flags); + raw_spin_unlock_irqrestore(&chip->gpio_lock, flags);
return 0; } @@ -404,7 +404,7 @@ static void xgpio_irq_mask(struct irq_data *irq_data) int bit = xgpio_to_bit(chip, irq_offset); u32 mask = BIT(bit / 32), temp;
- spin_lock_irqsave(&chip->gpio_lock, flags); + raw_spin_lock_irqsave(&chip->gpio_lock, flags);
__clear_bit(bit, chip->enable);
@@ -414,7 +414,7 @@ static void xgpio_irq_mask(struct irq_data *irq_data) temp &= ~mask; xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, temp); } - spin_unlock_irqrestore(&chip->gpio_lock, flags); + raw_spin_unlock_irqrestore(&chip->gpio_lock, flags);
gpiochip_disable_irq(&chip->gc, irq_offset); } @@ -434,7 +434,7 @@ static void xgpio_irq_unmask(struct irq_data *irq_data)
gpiochip_enable_irq(&chip->gc, irq_offset);
- spin_lock_irqsave(&chip->gpio_lock, flags); + raw_spin_lock_irqsave(&chip->gpio_lock, flags);
__set_bit(bit, chip->enable);
@@ -453,7 +453,7 @@ static void xgpio_irq_unmask(struct irq_data *irq_data) xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, val); }
- spin_unlock_irqrestore(&chip->gpio_lock, flags); + raw_spin_unlock_irqrestore(&chip->gpio_lock, flags); }
/** @@ -518,7 +518,7 @@ static void xgpio_irqhandler(struct irq_desc *desc)
chained_irq_enter(irqchip, desc);
- spin_lock(&chip->gpio_lock); + raw_spin_lock(&chip->gpio_lock);
xgpio_read_ch_all(chip, XGPIO_DATA_OFFSET, all);
@@ -535,7 +535,7 @@ static void xgpio_irqhandler(struct irq_desc *desc) bitmap_copy(chip->last_irq_read, all, 64); bitmap_or(all, rising, falling, 64);
- spin_unlock(&chip->gpio_lock); + raw_spin_unlock(&chip->gpio_lock);
dev_dbg(gc->parent, "IRQ rising %*pb falling %*pb\n", 64, rising, 64, falling);
@@ -636,7 +636,7 @@ static int xgpio_probe(struct platform_device *pdev) bitmap_set(chip->hw_map, 0, width[0]); bitmap_set(chip->hw_map, 32, width[1]);
- spin_lock_init(&chip->gpio_lock); + raw_spin_lock_init(&chip->gpio_lock);
chip->gc.base = -1; chip->gc.ngpio = bitmap_weight(chip->hw_map, 64);