[PATCH v2 04/15] usb: misc: ehset: update to use the usb_control_msg_{send|recv}() API

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam at gmail.com>
---
 drivers/usb/misc/ehset.c | 76 +++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 44 deletions(-)

diff --git a/drivers/usb/misc/ehset.c b/drivers/usb/misc/ehset.c
index 2752e1f4f4d0..f87890f9cd26 100644
--- a/drivers/usb/misc/ehset.c
+++ b/drivers/usb/misc/ehset.c
@@ -24,68 +24,57 @@ static int ehset_probe(struct usb_interface *intf,
 	int ret = -EINVAL;
 	struct usb_device *dev = interface_to_usbdev(intf);
 	struct usb_device *hub_udev = dev->parent;
-	struct usb_device_descriptor *buf;
+	struct usb_device_descriptor buf;
 	u8 portnum = dev->portnum;
 	u16 test_pid = le16_to_cpu(dev->descriptor.idProduct);
 
 	switch (test_pid) {
 	case TEST_SE0_NAK_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_SE0_NAK << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_SE0_NAK << 8) | portnum,
+					   NULL, 0, 1000, GFP_KERNEL);
 		break;
 	case TEST_J_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_J << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_J << 8) | portnum, NULL, 0,
+					   1000, GFP_KERNEL);
 		break;
 	case TEST_K_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_K << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_K << 8) | portnum, NULL, 0,
+					   1000, GFP_KERNEL);
 		break;
 	case TEST_PACKET_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_PACKET << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_PACKET << 8) | portnum,
+					   NULL, 0, 1000, GFP_KERNEL);
 		break;
 	case TEST_HS_HOST_PORT_SUSPEND_RESUME:
 		/* Test: wait for 15secs -> suspend -> 15secs delay -> resume */
 		msleep(15 * 1000);
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_SUSPEND, portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_SUSPEND,
+					   portnum, NULL, 0, 1000, GFP_KERNEL);
 		if (ret < 0)
 			break;
 
 		msleep(15 * 1000);
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_CLEAR_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_SUSPEND, portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_CLEAR_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_SUSPEND,
+					   portnum, NULL, 0, 1000, GFP_KERNEL);
 		break;
 	case TEST_SINGLE_STEP_GET_DEV_DESC:
 		/* Test: wait for 15secs -> GetDescriptor request */
 		msleep(15 * 1000);
-		buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
-		if (!buf)
-			return -ENOMEM;
 
-		ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-					USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
-					USB_DT_DEVICE << 8, 0,
-					buf, USB_DT_DEVICE_SIZE,
-					USB_CTRL_GET_TIMEOUT);
-		kfree(buf);
+		ret = usb_control_msg_recv(dev, 0, USB_REQ_GET_DESCRIPTOR,
+					   USB_DIR_IN, USB_DT_DEVICE << 8, 0,
+					   &buf, USB_DT_DEVICE_SIZE,
+					   USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 		break;
 	case TEST_SINGLE_STEP_SET_FEATURE:
 		/*
@@ -100,11 +89,10 @@ static int ehset_probe(struct usb_interface *intf,
 			break;
 		}
 
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(6 << 8) | portnum,
-					NULL, 0, 60 * 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (6 << 8) | portnum, NULL, 0,
+					   60 * 1000, GFP_KERNEL);
 
 		break;
 	default:
@@ -112,7 +100,7 @@ static int ehset_probe(struct usb_interface *intf,
 			__func__, test_pid);
 	}
 
-	return (ret < 0) ? ret : 0;
+	return ret;
 }
 
 static void ehset_disconnect(struct usb_interface *intf)
-- 
2.25.1