[RESEND PATCH] irqchip/irq-mtk-sysirq: replace spinlock with raw_spinlock

[RESEND PATCH] irqchip/irq-mtk-sysirq: replace spinlock with raw_spinlock

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

This driver may take a regular spinlock when a raw spinlock
(irq_desc->lock) is already taken which results in the following
lockdep splat:

=============================
[ BUG: Invalid wait context ]
5.7.0-rc7 #1 Not tainted
-----------------------------
swapper/0/0 is trying to lock:
ffffff800303b798 (&chip_data->lock){....}-{3:3}, at: mtk_sysirq_set_type+0x48/0xc0
other info that might help us debug this:
context-{5:5}
2 locks held by swapper/0/0:
 #0: ffffff800302ee68 (&desc->request_mutex){....}-{4:4}, at: __setup_irq+0xc4/0x8a0
 #1: ffffff800302ecf0 (&irq_desc_lock_class){....}-{2:2}, at: __setup_irq+0xe4/0x8a0
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7 #1
Hardware name: Pumpkin MT8516 (DT)
Call trace:
 dump_backtrace+0x0/0x180
 show_stack+0x14/0x20
 dump_stack+0xd0/0x118
 __lock_acquire+0x8c8/0x2270
 lock_acquire+0xf8/0x470
 _raw_spin_lock_irqsave+0x50/0x78
 mtk_sysirq_set_type+0x48/0xc0
 __irq_set_trigger+0x58/0x170
 __setup_irq+0x420/0x8a0
 request_threaded_irq+0xd8/0x190
 timer_of_init+0x1e8/0x2c4
 mtk_gpt_init+0x5c/0x1dc
 timer_probe+0x74/0xf4
 time_init+0x14/0x44
 start_kernel+0x394/0x4f0

Replace the spinlock_t with raw_spinlock_t to avoid this warning.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
Rebased on top of v5.8-rc1.

 drivers/irqchip/irq-mtk-sysirq.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c
index 73eae5966a40..6ff98b87e5c0 100644
--- a/drivers/irqchip/irq-mtk-sysirq.c
+++ b/drivers/irqchip/irq-mtk-sysirq.c
@@ -15,7 +15,7 @@
 #include <linux/spinlock.h>
 
 struct mtk_sysirq_chip_data {
-	spinlock_t lock;
+	raw_spinlock_t lock;
 	u32 nr_intpol_bases;
 	void __iomem **intpol_bases;
 	u32 *intpol_words;
@@ -37,7 +37,7 @@ static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
 	reg_index = chip_data->which_word[hwirq];
 	offset = hwirq & 0x1f;
 
-	spin_lock_irqsave(&chip_data->lock, flags);
+	raw_spin_lock_irqsave(&chip_data->lock, flags);
 	value = readl_relaxed(base + reg_index * 4);
 	if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
 		if (type == IRQ_TYPE_LEVEL_LOW)
@@ -53,7 +53,7 @@ static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
 
 	data = data->parent_data;
 	ret = data->chip->irq_set_type(data, type);
-	spin_unlock_irqrestore(&chip_data->lock, flags);
+	raw_spin_unlock_irqrestore(&chip_data->lock, flags);
 	return ret;
 }
 
@@ -212,7 +212,7 @@ static int __init mtk_sysirq_of_init(struct device_node *node,
 		ret = -ENOMEM;
 		goto out_free_which_word;
 	}
-	spin_lock_init(&chip_data->lock);
+	raw_spin_lock_init(&chip_data->lock);
 
 	return 0;
 
-- 
2.26.1

Re: [RESEND PATCH] irqchip/irq-mtk-sysirq: replace spinlock with raw_spinlock

[Marc Zyngier]

On Mon, 15 Jun 2020 09:44:45 +0200, Bartosz Golaszewski wrote:
> This driver may take a regular spinlock when a raw spinlock
> (irq_desc->lock) is already taken which results in the following
> lockdep splat:
> 
> =============================
> [ BUG: Invalid wait context ]
> 5.7.0-rc7 #1 Not tainted
> -----------------------------
> swapper/0/0 is trying to lock:
> ffffff800303b798 (&chip_data->lock){....}-{3:3}, at: mtk_sysirq_set_type+0x48/0xc0
> other info that might help us debug this:
> context-{5:5}
> 2 locks held by swapper/0/0:
>  #0: ffffff800302ee68 (&desc->request_mutex){....}-{4:4}, at: __setup_irq+0xc4/0x8a0
>  #1: ffffff800302ecf0 (&irq_desc_lock_class){....}-{2:2}, at: __setup_irq+0xe4/0x8a0
> stack backtrace:
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7 #1
> Hardware name: Pumpkin MT8516 (DT)
> Call trace:
>  dump_backtrace+0x0/0x180
>  show_stack+0x14/0x20
>  dump_stack+0xd0/0x118
>  __lock_acquire+0x8c8/0x2270
>  lock_acquire+0xf8/0x470
>  _raw_spin_lock_irqsave+0x50/0x78
>  mtk_sysirq_set_type+0x48/0xc0
>  __irq_set_trigger+0x58/0x170
>  __setup_irq+0x420/0x8a0
>  request_threaded_irq+0xd8/0x190
>  timer_of_init+0x1e8/0x2c4
>  mtk_gpt_init+0x5c/0x1dc
>  timer_probe+0x74/0xf4
>  time_init+0x14/0x44
>  start_kernel+0x394/0x4f0
> 
> [...]

Applied to irq/irqchip-5.9:

[1/1] irqchip/irq-mtk-sysirq: Replace spinlock with raw_spinlock
      commit: 6eeb997ab5075e770a002c51351fa4ec2c6b5c39

Thanks,

	M.
-- 
Without deviation from the norm, progress is not possible.