[PATCH] usb: gadget: lpc32xx_udc: cancel pullup work on remove

[Hongyan Xu]

Several device interrupts can queue pullup_job, whose callback accesses
the UDC and its I2C transceiver. The IRQs are device-managed, so they
remain registered throughout the driver remove callback, and no path
drains work queued before the resources are released.

Disable and synchronize all publishing IRQs, then cancel pullup_job
before putting the I2C device and releasing the UDC resources.

Fixes: 24a28e428351 ("USB: gadget driver for LPC32xx")
Signed-off-by: Hongyan Xu <getshell at seu.edu.cn>
---
 drivers/usb/gadget/udc/lpc32xx_udc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
index 044c31869cfb..0a784c9252c5 100644
--- a/drivers/usb/gadget/udc/lpc32xx_udc.c
+++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
@@ -3184,9 +3184,15 @@ static void lpc32xx_udc_remove(struct platform_device *pdev)
 		return;
 	}
 
+	disable_irq(udc->udp_irq[IRQ_USB_LP]);
+	disable_irq(udc->udp_irq[IRQ_USB_HP]);
+	disable_irq(udc->udp_irq[IRQ_USB_DEVDMA]);
+	disable_irq(udc->udp_irq[IRQ_USB_ATX]);
+
 	udc_clk_set(udc, 1);
 	udc_disable(udc);
 	pullup(udc, 0);
+	cancel_work_sync(&udc->pullup_job);
 
 	device_init_wakeup(&pdev->dev, 0);
 	remove_debug_file(udc);
-- 
2.50.1.windows.1