[PATCH] usb: typec: fusb302: fix scheduling while atomic when using virtio-gpio

[Yongbo Zhang <giraffesnn123@gmail.com>]

When the gpio irqchip connected to a slow bus(e.g., i2c bus or virtio
bus), calling disable_irq_nosync() in top-half ISR handler will trigger
the following kernel BUG:

BUG: scheduling while atomic: RenderEngine/253/0x00010002
...
Call trace:
 dump_backtrace+0x0/0x1c8
 show_stack+0x1c/0x2c
 dump_stack_lvl+0xdc/0x12c
 dump_stack+0x1c/0x64
 __schedule_bug+0x64/0x80
 schedule_debug+0x98/0x118
 __schedule+0x68/0x704
 schedule+0xa0/0xe8
 schedule_timeout+0x38/0x124
 wait_for_common+0xa4/0x134
 wait_for_completion+0x1c/0x2c
 _virtio_gpio_req+0xf8/0x198
 virtio_gpio_irq_bus_sync_unlock+0x94/0xf0
 __irq_put_desc_unlock+0x50/0x54
 disable_irq_nosync+0x64/0x94
 fusb302_irq_intn+0x24/0x84
 __handle_irq_event_percpu+0x84/0x278
 handle_irq_event+0x64/0x14c
 handle_level_irq+0x134/0x1d4
 generic_handle_domain_irq+0x40/0x68
 virtio_gpio_event_vq+0xb0/0x130
 vring_interrupt+0x7c/0x90
 vm_interrupt+0x88/0xd8
 __handle_irq_event_percpu+0x84/0x278
 handle_irq_event+0x64/0x14c
 handle_fasteoi_irq+0x110/0x210
 __handle_domain_irq+0x80/0xd0
 gic_handle_irq+0x78/0x154
 el0_irq_naked+0x60/0x6c

This patch replaces request_irq() with devm_request_threaded_irq() to
avoid the use of disable_irq_nosync().

Signed-off-by: Yongbo Zhang <giraffesnn123@gmail.com>
---
 drivers/usb/typec/tcpm/fusb302.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
index f15c63d3a8f4..f2801279c4b5 100644
--- a/drivers/usb/typec/tcpm/fusb302.c
+++ b/drivers/usb/typec/tcpm/fusb302.c
@@ -1477,9 +1477,6 @@ static irqreturn_t fusb302_irq_intn(int irq, void *dev_id)
 	struct fusb302_chip *chip = dev_id;
 	unsigned long flags;

-	/* Disable our level triggered IRQ until our irq_work has cleared it */
-	disable_irq_nosync(chip->gpio_int_n_irq);
-
 	spin_lock_irqsave(&chip->irq_lock, flags);
 	if (chip->irq_suspended)
 		chip->irq_while_suspended = true;
@@ -1622,7 +1619,6 @@ static void fusb302_irq_work(struct work_struct *work)
 	}
 done:
 	mutex_unlock(&chip->lock);
-	enable_irq(chip->gpio_int_n_irq);
 }

 static int init_gpio(struct fusb302_chip *chip)
@@ -1747,9 +1743,10 @@ static int fusb302_probe(struct i2c_client *client)
 		goto destroy_workqueue;
 	}

-	ret = request_irq(chip->gpio_int_n_irq, fusb302_irq_intn,
-			  IRQF_ONESHOT | IRQF_TRIGGER_LOW,
-			  "fsc_interrupt_int_n", chip);
+	ret = devm_request_threaded_irq(dev, chip->gpio_int_n_irq,
+					NULL, fusb302_irq_intn,
+					IRQF_ONESHOT | IRQF_TRIGGER_LOW,
+					"fsc_interrupt_int_n", chip);
 	if (ret < 0) {
 		dev_err(dev, "cannot request IRQ for GPIO Int_N, ret=%d", ret);
 		goto tcpm_unregister_port;
@@ -1774,7 +1771,6 @@ static void fusb302_remove(struct i2c_client *client)
 	struct fusb302_chip *chip = i2c_get_clientdata(client);

 	disable_irq_wake(chip->gpio_int_n_irq);
-	free_irq(chip->gpio_int_n_irq, chip);
 	cancel_work_sync(&chip->irq_work);
 	cancel_delayed_work_sync(&chip->bc_lvl_handler);
 	tcpm_unregister_port(chip->tcpm_port);
--
2.49.0