[PATCH] USB: lh7a40x gadget driver: Fixed a dead lock
There is a dead lock in lh7a40x udc driver. When the driver receive a
SET_FEATURE HALT request, the dev lock is taken by the interrupt
handler lh7a40x_udc_irq then the handler will call lh7a40x_set_halt
function which in its turn will try to acquire the dev lock.
Signed-off-by: Franck Bui-Huu <franck.bui-huu@innova-card.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/lh7a40x_udc.c b/drivers/usb/gadget/lh7a40x_udc.c
index e02fea5..1a362c5e 100644
--- a/drivers/usb/gadget/lh7a40x_udc.c
+++ b/drivers/usb/gadget/lh7a40x_udc.c
@@ -1062,11 +1062,11 @@
ep->pio_irqs = 0;
ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+ spin_unlock_irqrestore(&ep->dev->lock, flags);
+
/* Reset halt state (does flush) */
lh7a40x_set_halt(_ep, 0);
- spin_unlock_irqrestore(&ep->dev->lock, flags);
-
DEBUG("%s: enabled %s\n", __FUNCTION__, _ep->name);
return 0;
}
@@ -1775,6 +1775,7 @@
break;
qep = &dev->ep[ep_num];
+ spin_unlock(&dev->lock);
if (ctrl.bRequest == USB_REQ_SET_FEATURE) {
DEBUG_SETUP("SET_FEATURE (%d)\n",
ep_num);
@@ -1784,6 +1785,7 @@
ep_num);
lh7a40x_set_halt(&qep->ep, 0);
}
+ spin_lock(&dev->lock);
usb_set_index(0);
/* Reply with a ZLP on next IN token */