usb: misc: usbsevseg: update to use usb_control_msg_send()

The newer usb_control_msg_{send|recv}() API ensures that a short read 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_send() appropriately.
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Link: https://lore.kernel.org/r/20210326223251.753952-4-anant.thazhemadam@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/usbsevseg.c

@@ -74,15 +74,10 @@ static void update_display_powered(struct usb_sevsegdev *mydev)
 	if (mydev->shadow_power != 1)
 		return;
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
 				  (80 * 0x100) + 10, /*  (power mode) */
 				  (0x00 * 0x100) + (mydev->powered ? 1 : 0),
-			NULL,
-			0,
-			2000);
+				  NULL, 0, 2000, GFP_KERNEL);
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
 
@@ -99,15 +94,10 @@ static void update_display_mode(struct usb_sevsegdev *mydev)
 	if(mydev->shadow_power != 1)
 		return;
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
 				  (82 * 0x100) + 10, /* (set mode) */
 				  (mydev->mode_msb * 0x100) + mydev->mode_lsb,
-			NULL,
-			0,
-			2000);
+				  NULL, 0, 2000, GFP_NOIO);
 
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
@@ -117,48 +107,32 @@ static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
 {
 	int rc;
 	int i;
-	unsigned char *buffer;
+	unsigned char buffer[MAXLEN] = {0};
 	u8 decimals = 0;
 
 	if(mydev->shadow_power != 1)
 		return;
 
-	buffer = kzalloc(MAXLEN, mf);
-	if (!buffer)
-		return;
-
 	/* The device is right to left, where as you write left to right */
 	for (i = 0; i < mydev->textlength; i++)
 		buffer[i] = mydev->text[mydev->textlength-1-i];
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
 				  (85 * 0x100) + 10, /* (write text) */
 				  (0 * 0x100) + mydev->textmode, /* mode  */
-			buffer,
-			mydev->textlength,
-			2000);
+				  &buffer, mydev->textlength, 2000, mf);
 
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
 
-	kfree(buffer);
-
 	/* The device is right to left, where as you write left to right */
 	for (i = 0; i < sizeof(mydev->decimals); i++)
 		decimals |= mydev->decimals[i] << i;
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
 				  (86 * 0x100) + 10, /* (set decimal) */
 				  (0 * 0x100) + decimals, /* decimals */
-			NULL,
-			0,
-			2000);
+				  NULL, 0, 2000, mf);
 
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);