1 files changed, 21 insertions, 22 deletions

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 18e5ddd722cd..606369ea24ca 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -781,6 +781,8 @@ static int usbhid_start(struct hid_device *hid)
 	unsigned int n, insize = 0;
 	int ret;
 
+	clear_bit(HID_DISCONNECTED, &usbhid->iofl);
+
 	usbhid->bufsize = HID_MIN_BUFFER_SIZE;
 	hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
 	hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
@@ -794,7 +796,6 @@ static int usbhid_start(struct hid_device *hid)
 	if (insize > HID_MAX_BUFFER_SIZE)
 		insize = HID_MAX_BUFFER_SIZE;
 
-	mutex_lock(&usbhid->setup);
 	if (hid_alloc_buffers(dev, hid)) {
 		ret = -ENOMEM;
 		goto fail;
@@ -847,12 +848,6 @@ static int usbhid_start(struct hid_device *hid)
 		}
 	}
 
-	if (!usbhid->urbin) {
-		err_hid("couldn't find an input interrupt endpoint");
-		ret = -ENODEV;
-		goto fail;
-	}
-
 	init_waitqueue_head(&usbhid->wait);
 	INIT_WORK(&usbhid->reset_work, hid_reset);
 	setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
@@ -880,7 +875,6 @@ static int usbhid_start(struct hid_device *hid)
 	hid_dump_device(hid);
 
 	set_bit(HID_STARTED, &usbhid->iofl);
-	mutex_unlock(&usbhid->setup);
 
 	return 0;
 
@@ -888,8 +882,10 @@ fail:
 	usb_free_urb(usbhid->urbin);
 	usb_free_urb(usbhid->urbout);
 	usb_free_urb(usbhid->urbctrl);
+	usbhid->urbin = NULL;
+	usbhid->urbout = NULL;
+	usbhid->urbctrl = NULL;
 	hid_free_buffers(dev, hid);
-	mutex_unlock(&usbhid->setup);
 	return ret;
 }
 
@@ -900,7 +896,6 @@ static void usbhid_stop(struct hid_device *hid)
 	if (WARN_ON(!usbhid))
 		return;
 
-	mutex_lock(&usbhid->setup);
 	clear_bit(HID_STARTED, &usbhid->iofl);
 	spin_lock_irq(&usbhid->inlock);	/* Sync with error handler */
 	set_bit(HID_DISCONNECTED, &usbhid->iofl);
@@ -924,9 +919,11 @@ static void usbhid_stop(struct hid_device *hid)
 	usb_free_urb(usbhid->urbin);
 	usb_free_urb(usbhid->urbctrl);
 	usb_free_urb(usbhid->urbout);
+	usbhid->urbin = NULL; /* don't mess up next start */
+	usbhid->urbctrl = NULL;
+	usbhid->urbout = NULL;
 
 	hid_free_buffers(hid_to_usb_dev(hid), hid);
-	mutex_unlock(&usbhid->setup);
 }
 
 static struct hid_ll_driver usb_hid_driver = {
@@ -940,15 +937,26 @@ static struct hid_ll_driver usb_hid_driver = {
 
 static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
+	struct usb_host_interface *interface = intf->cur_altsetting;
 	struct usb_device *dev = interface_to_usbdev(intf);
 	struct usbhid_device *usbhid;
 	struct hid_device *hid;
+	unsigned int n, has_in = 0;
 	size_t len;
 	int ret;
 
 	dbg_hid("HID probe called for ifnum %d\n",
 			intf->altsetting->desc.bInterfaceNumber);
 
+	for (n = 0; n < interface->desc.bNumEndpoints; n++)
+		if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
+			has_in++;
+	if (!has_in) {
+		dev_err(&intf->dev, "couldn't find an input interrupt "
+				"endpoint\n");
+		return -ENODEV;
+	}
+
 	hid = hid_allocate_device();
 	if (IS_ERR(hid))
 		return PTR_ERR(hid);
@@ -1003,7 +1011,6 @@ static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
 
 	hid->driver_data = usbhid;
 	usbhid->hid = hid;
-	mutex_init(&usbhid->setup); /* needed on suspend/resume */
 
 	ret = hid_add_device(hid);
 	if (ret) {
@@ -1038,18 +1045,14 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
 	struct hid_device *hid = usb_get_intfdata (intf);
 	struct usbhid_device *usbhid = hid->driver_data;
 
-	mutex_lock(&usbhid->setup);
-	if (!test_bit(HID_STARTED, &usbhid->iofl)) {
-		mutex_unlock(&usbhid->setup);
+	if (!test_bit(HID_STARTED, &usbhid->iofl))
 		return 0;
-	}
 
 	spin_lock_irq(&usbhid->inlock);	/* Sync with error handler */
 	set_bit(HID_SUSPENDED, &usbhid->iofl);
 	spin_unlock_irq(&usbhid->inlock);
 	del_timer_sync(&usbhid->io_retry);
 	usb_kill_urb(usbhid->urbin);
-	mutex_unlock(&usbhid->setup);
 	dev_dbg(&intf->dev, "suspend\n");
 	return 0;
 }
@@ -1060,16 +1063,12 @@ static int hid_resume(struct usb_interface *intf)
 	struct usbhid_device *usbhid = hid->driver_data;
 	int status;
 
-	mutex_lock(&usbhid->setup);
-	if (!test_bit(HID_STARTED, &usbhid->iofl)) {
-		mutex_unlock(&usbhid->setup);
+	if (!test_bit(HID_STARTED, &usbhid->iofl))
 		return 0;
-	}
 
 	clear_bit(HID_SUSPENDED, &usbhid->iofl);
 	usbhid->retry_delay = 0;
 	status = hid_start_in(hid);
-	mutex_unlock(&usbhid->setup);
 	dev_dbg(&intf->dev, "resume status %d\n", status);
 	return status;
 }