[PATCH] [MUSB] fix bug: when no USB device is plugged into the port of EZKIT-BF548, USB OTG host mode got BUG()

[Bryan Wu <bryan.wu@analog.com>]

Subject: [PATCH] [MUSB] fix bug: when no USB device is plugged into the port of EZKIT-BF548, USB OTG host mode got BUG()

Move IRQ workqueue init before request_irq, otherwise host SUSPEND irq
will call schedule_work() and BUG_ON() will fire because musb_irq_work did
not initialised.

We recorded it at
https://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_id=141&tracker_item_id=3740

Although the Blackfin port of MUSB is not merged, this bug should be
common for other platform with MUSB

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
 drivers/usb/musb/musb_core.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 33774a6..008f42c 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1992,6 +1992,9 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
 	if (status < 0)
 		goto fail2;
 
+	/* Init IRQ workqueue before request_irq */
+	INIT_WORK(&musb->irq_work, musb_irq_work);
+
 	/* attach to the IRQ */
 	if (request_irq (nIrq, musb->isr, 0, dev->bus_id, musb)) {
 		dev_err(dev, "request_irq %d failed!\n", nIrq);
@@ -2071,8 +2074,6 @@ fail:
 		return status;
 	}
 
-	INIT_WORK(&musb->irq_work, musb_irq_work);
-
 #ifdef CONFIG_SYSFS
 	status = device_create_file(dev, &dev_attr_mode);
 	status = device_create_file(dev, &dev_attr_vbus);
-- 
1.5.3