linux-kernel - [PATCH 07/15] usb: serial: f81534: use usb_control_msg_recv() and usb_control_msg

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Message-Id: <20201104064703.15123-8-himadrispandya@gmail.com>
Date:   Wed,  4 Nov 2020 12:16:55 +0530
From:   Himadri Pandya <himadrispandya@...il.com>
To:     johan@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        Himadri Pandya <himadrispandya@...il.com>
Subject: [PATCH 07/15] usb: serial: f81534: use usb_control_msg_recv() and usb_control_msg_send()

The new usb_control_msg_recv() and usb_control_msg_send() nicely wraps
usb_control_msg() with proper error check. Hence use the wrappers
instead of calling usb_control_msg() directly.

Signed-off-by: Himadri Pandya <himadrispandya@...il.com>
---
 drivers/usb/serial/f81534.c | 63 +++++++++++--------------------------
 1 file changed, 18 insertions(+), 45 deletions(-)

diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 5661fd03e545..23eb17a2c052 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -217,38 +217,26 @@ static int f81534_set_register(struct usb_serial *serial, u16 reg, u8 data)
 	struct usb_device *dev = serial->dev;
 	size_t count = F81534_USB_MAX_RETRY;
 	int status;
-	u8 *tmp;
-
-	tmp = kmalloc(sizeof(u8), GFP_KERNEL);
-	if (!tmp)
-		return -ENOMEM;
-
-	*tmp = data;
 
 	/*
 	 * Our device maybe not reply when heavily loading, We'll retry for
 	 * F81534_USB_MAX_RETRY times.
 	 */
 	while (count--) {
-		status = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
-					 F81534_SET_GET_REGISTER,
-					 USB_TYPE_VENDOR | USB_DIR_OUT,
-					 reg, 0, tmp, sizeof(u8),
-					 F81534_USB_TIMEOUT);
-		if (status > 0) {
-			status = 0;
-			break;
-		} else if (status == 0) {
-			status = -EIO;
+		status = usb_control_msg_send(dev, 0, F81534_SET_GET_REGISTER,
+					      USB_TYPE_VENDOR | USB_DIR_OUT,
+					      reg, 0, &data, sizeof(u8),
+					      F81534_USB_TIMEOUT, GFP_KERNEL);
+		if (status) {
+			/* Try again */
+			continue;
 		}
 	}
 
-	if (status < 0) {
+	if (status)
 		dev_err(&interface->dev, "%s: reg: %x data: %x failed: %d\n",
-				__func__, reg, data, status);
-	}
+			__func__, reg, data, status);
 
-	kfree(tmp);
 	return status;
 }
 
@@ -258,40 +246,25 @@ static int f81534_get_register(struct usb_serial *serial, u16 reg, u8 *data)
 	struct usb_device *dev = serial->dev;
 	size_t count = F81534_USB_MAX_RETRY;
 	int status;
-	u8 *tmp;
-
-	tmp = kmalloc(sizeof(u8), GFP_KERNEL);
-	if (!tmp)
-		return -ENOMEM;
 
 	/*
 	 * Our device maybe not reply when heavily loading, We'll retry for
 	 * F81534_USB_MAX_RETRY times.
 	 */
 	while (count--) {
-		status = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-					 F81534_SET_GET_REGISTER,
-					 USB_TYPE_VENDOR | USB_DIR_IN,
-					 reg, 0, tmp, sizeof(u8),
-					 F81534_USB_TIMEOUT);
-		if (status > 0) {
-			status = 0;
-			break;
-		} else if (status == 0) {
-			status = -EIO;
+		status = usb_control_msg_recv(dev, 0, F81534_SET_GET_REGISTER,
+					      USB_TYPE_VENDOR | USB_DIR_IN, reg,
+					      0, data, sizeof(u8),
+					      F81534_USB_TIMEOUT, GFP_KERNEL);
+		if (status) {
+			/* Try again */
+			continue;
 		}
 	}
 
-	if (status < 0) {
+	if (status)
 		dev_err(&interface->dev, "%s: reg: %x failed: %d\n", __func__,
-				reg, status);
-		goto end;
-	}
-
-	*data = *tmp;
-
-end:
-	kfree(tmp);
+			reg, status);
 	return status;
 }
 
-- 
2.17.1