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Message-Id: <20211204171027.451220-1-iwona.winiarska@intel.com>
Date: Sat, 4 Dec 2021 18:10:26 +0100
From: Iwona Winiarska <iwona.winiarska@...el.com>
To: linux-gpio@...r.kernel.org,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-arm-kernel@...ts.infradead.org,
linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>,
Iwona Winiarska <iwona.winiarska@...el.com>
Subject: [PATCH 1/2] gpio: aspeed: Convert aspeed_gpio.lock to raw_spinlock
The gpio-aspeed driver implements an irq_chip which need to be invoked
from hardirq context. Since spin_lock() can sleep with PREEMPT_RT, it is
no longer legal to invoke it while interrupts are disabled.
This also causes lockdep to complain about:
[ 0.649797] [ BUG: Invalid wait context ]
because aspeed_gpio.lock (spin_lock_t) is taken under irq_desc.lock
(raw_spinlock_t).
Let's use of raw_spinlock_t instead of spinlock_t.
Signed-off-by: Iwona Winiarska <iwona.winiarska@...el.com>
---
drivers/gpio/gpio-aspeed.c | 52 +++++++++++++++++++-------------------
1 file changed, 26 insertions(+), 26 deletions(-)
diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index 3c8f20c57695..318a7d95a1a8 100644
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -53,7 +53,7 @@ struct aspeed_gpio_config {
struct aspeed_gpio {
struct gpio_chip chip;
struct irq_chip irqc;
- spinlock_t lock;
+ raw_spinlock_t lock;
void __iomem *base;
int irq;
const struct aspeed_gpio_config *config;
@@ -413,14 +413,14 @@ static void aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,
unsigned long flags;
bool copro;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
copro = aspeed_gpio_copro_request(gpio, offset);
__aspeed_gpio_set(gc, offset, val);
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
}
static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
@@ -435,7 +435,7 @@ static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
if (!have_input(gpio, offset))
return -ENOTSUPP;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
reg = ioread32(addr);
reg &= ~GPIO_BIT(offset);
@@ -445,7 +445,7 @@ static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return 0;
}
@@ -463,7 +463,7 @@ static int aspeed_gpio_dir_out(struct gpio_chip *gc,
if (!have_output(gpio, offset))
return -ENOTSUPP;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
reg = ioread32(addr);
reg |= GPIO_BIT(offset);
@@ -474,7 +474,7 @@ static int aspeed_gpio_dir_out(struct gpio_chip *gc,
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return 0;
}
@@ -492,11 +492,11 @@ static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
if (!have_output(gpio, offset))
return GPIO_LINE_DIRECTION_IN;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
val = ioread32(bank_reg(gpio, bank, reg_dir)) & GPIO_BIT(offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return val ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
}
@@ -539,14 +539,14 @@ static void aspeed_gpio_irq_ack(struct irq_data *d)
status_addr = bank_reg(gpio, bank, reg_irq_status);
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
copro = aspeed_gpio_copro_request(gpio, offset);
iowrite32(bit, status_addr);
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
}
static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set)
@@ -565,7 +565,7 @@ static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set)
addr = bank_reg(gpio, bank, reg_irq_enable);
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
copro = aspeed_gpio_copro_request(gpio, offset);
reg = ioread32(addr);
@@ -577,7 +577,7 @@ static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set)
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
}
static void aspeed_gpio_irq_mask(struct irq_data *d)
@@ -629,7 +629,7 @@ static int aspeed_gpio_set_type(struct irq_data *d, unsigned int type)
return -EINVAL;
}
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
copro = aspeed_gpio_copro_request(gpio, offset);
addr = bank_reg(gpio, bank, reg_irq_type0);
@@ -649,7 +649,7 @@ static int aspeed_gpio_set_type(struct irq_data *d, unsigned int type)
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
irq_set_handler_locked(d, handler);
@@ -716,7 +716,7 @@ static int aspeed_gpio_reset_tolerance(struct gpio_chip *chip,
treg = bank_reg(gpio, to_bank(offset), reg_tolerance);
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
copro = aspeed_gpio_copro_request(gpio, offset);
val = readl(treg);
@@ -730,7 +730,7 @@ static int aspeed_gpio_reset_tolerance(struct gpio_chip *chip,
if (copro)
aspeed_gpio_copro_release(gpio, offset);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return 0;
}
@@ -856,7 +856,7 @@ static int enable_debounce(struct gpio_chip *chip, unsigned int offset,
return rc;
}
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
if (timer_allocation_registered(gpio, offset)) {
rc = unregister_allocated_timer(gpio, offset);
@@ -916,7 +916,7 @@ static int enable_debounce(struct gpio_chip *chip, unsigned int offset,
configure_timer(gpio, offset, i);
out:
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return rc;
}
@@ -927,13 +927,13 @@ static int disable_debounce(struct gpio_chip *chip, unsigned int offset)
unsigned long flags;
int rc;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
rc = unregister_allocated_timer(gpio, offset);
if (!rc)
configure_timer(gpio, offset, 0);
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return rc;
}
@@ -1015,7 +1015,7 @@ int aspeed_gpio_copro_grab_gpio(struct gpio_desc *desc,
return -EINVAL;
bindex = offset >> 3;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
/* Sanity check, this shouldn't happen */
if (gpio->cf_copro_bankmap[bindex] == 0xff) {
@@ -1036,7 +1036,7 @@ int aspeed_gpio_copro_grab_gpio(struct gpio_desc *desc,
if (bit)
*bit = GPIO_OFFSET(offset);
bail:
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return rc;
}
EXPORT_SYMBOL_GPL(aspeed_gpio_copro_grab_gpio);
@@ -1060,7 +1060,7 @@ int aspeed_gpio_copro_release_gpio(struct gpio_desc *desc)
return -EINVAL;
bindex = offset >> 3;
- spin_lock_irqsave(&gpio->lock, flags);
+ raw_spin_lock_irqsave(&gpio->lock, flags);
/* Sanity check, this shouldn't happen */
if (gpio->cf_copro_bankmap[bindex] == 0) {
@@ -1074,7 +1074,7 @@ int aspeed_gpio_copro_release_gpio(struct gpio_desc *desc)
aspeed_gpio_change_cmd_source(gpio, bank, bindex,
GPIO_CMDSRC_ARM);
bail:
- spin_unlock_irqrestore(&gpio->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio->lock, flags);
return rc;
}
EXPORT_SYMBOL_GPL(aspeed_gpio_copro_release_gpio);
@@ -1148,7 +1148,7 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpio->base))
return PTR_ERR(gpio->base);
- spin_lock_init(&gpio->lock);
+ raw_spin_lock_init(&gpio->lock);
gpio_id = of_match_node(aspeed_gpio_of_table, pdev->dev.of_node);
if (!gpio_id)
--
2.31.1
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