[v2,02/15] usb: misc: cypress_cy7c63: update to use usb_control_msg_recv()

Commit Message

Anant Thazhemadam Nov. 30, 2020, 1:26 a.m. UTC

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, the instance of usb_control_msg() has been replaced with
usb_control_msg_recv().

Signed-off-by: Anant Thazhemadam <[e-mail]>
---
 drivers/usb/misc/cypress_cy7c63.c | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

Patch

diff --git a/drivers/usb/misc/cypress_cy7c63.c b/drivers/usb/misc/cypress_cy7c63.c
index 14faec51d7a5..76a320ef17a7 100644
--- a/drivers/usb/misc/cypress_cy7c63.c
+++ b/drivers/usb/misc/cypress_cy7c63.c
@@ -70,24 +70,15 @@  static int vendor_command(struct cypress *dev, unsigned char request,
 			  unsigned char address, unsigned char data)
 {
 	int retval = 0;
-	unsigned int pipe;
-	unsigned char *iobuf;
-
-	/* allocate some memory for the i/o buffer*/
-	iobuf = kzalloc(CYPRESS_MAX_REQSIZE, GFP_KERNEL);
-	if (!iobuf) {
-		retval = -ENOMEM;
-		goto error;
-	}
+	u8 iobuf[CYPRESS_MAX_REQSIZE] = {0};
 
 	dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
 
 	/* prepare usb control message and send it upstream */
-	pipe = usb_rcvctrlpipe(dev->udev, 0);
-	retval = usb_control_msg(dev->udev, pipe, request,
-				 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
-				 address, data, iobuf, CYPRESS_MAX_REQSIZE,
-				 USB_CTRL_GET_TIMEOUT);
+	retval = usb_control_msg_recv(dev->udev, 0, request,
+				      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+				      address, data, &iobuf, CYPRESS_MAX_REQSIZE,
+				      USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 
 	/* store returned data (more READs to be added) */
 	switch (request) {
@@ -107,8 +98,6 @@  static int vendor_command(struct cypress *dev, unsigned char request,
 			break;
 	}
 
-	kfree(iobuf);
-error:
 	return retval;
 }