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USB: serial: cp210x: use usb_control_msg_recv() and usb_control_msg_send()

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The new wrapper functions for usb_control_msg() can accept data from
stack and treat short reads as errors. Hence use the wrappers functions.
Please note that because of this change, cp210x_read_reg_block() will no
longer log the length of short reads.

Signed-off-by: Himadri Pandya <himadrispandya@gmail.com>
Link: https://lore.kernel.org/r/20211001065720.21330-3-himadrispandya@gmail.com
[ johan: style changes ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Himadri Pandya 2021-10-01 08:57:20 +02:00 committed by Johan Hovold
parent 74f2664550
commit f5cfbecb0a
1 changed files with 31 additions and 78 deletions
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109
drivers/usb/serial/cp210x.c
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@ -629,30 +629,20 @@ static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
void *dmabuf;
int result;
dmabuf = kmalloc(bufsize, GFP_KERNEL);
if (!dmabuf)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
req, REQTYPE_INTERFACE_TO_HOST, 0,
port_priv->bInterfaceNumber, dmabuf, bufsize,
USB_CTRL_GET_TIMEOUT);
if (result == bufsize) {
memcpy(buf, dmabuf, bufsize);
result = 0;
} else {
result = usb_control_msg_recv(serial->dev, 0, req,
REQTYPE_INTERFACE_TO_HOST, 0,
port_priv->bInterfaceNumber, buf, bufsize,
USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
req, bufsize, result);
if (result >= 0)
result = -EIO;
return result;
}
kfree(dmabuf);
return result;
return 0;
}
/*
@ -670,31 +660,19 @@ static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
void *buf, int bufsize)
{
void *dmabuf;
int result;
dmabuf = kmalloc(bufsize, GFP_KERNEL);
if (!dmabuf)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
CP210X_VENDOR_SPECIFIC, type, val,
cp210x_interface_num(serial), dmabuf, bufsize,
USB_CTRL_GET_TIMEOUT);
if (result == bufsize) {
memcpy(buf, dmabuf, bufsize);
result = 0;
} else {
result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
type, val, cp210x_interface_num(serial), buf, bufsize,
USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&serial->interface->dev,
"failed to get vendor val 0x%04x size %d: %d\n", val,
bufsize, result);
if (result >= 0)
result = -EIO;
return result;
}
kfree(dmabuf);
return result;
return 0;
}
/*
@ -728,21 +706,13 @@ static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
void *dmabuf;
int result;
dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
if (!dmabuf)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
req, REQTYPE_HOST_TO_INTERFACE, 0,
port_priv->bInterfaceNumber, dmabuf, bufsize,
USB_CTRL_SET_TIMEOUT);
kfree(dmabuf);
if (result < 0) {
result = usb_control_msg_send(serial->dev, 0, req,
REQTYPE_HOST_TO_INTERFACE, 0,
port_priv->bInterfaceNumber, buf, bufsize,
USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
req, bufsize, result);
return result;
@ -771,21 +741,12 @@ static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
u16 val, void *buf, int bufsize)
{
void *dmabuf;
int result;
dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
if (!dmabuf)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
CP210X_VENDOR_SPECIFIC, type, val,
cp210x_interface_num(serial), dmabuf, bufsize,
USB_CTRL_SET_TIMEOUT);
kfree(dmabuf);
if (result < 0) {
result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
type, val, cp210x_interface_num(serial), buf, bufsize,
USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&serial->interface->dev,
"failed to set vendor val 0x%04x size %d: %d\n", val,
bufsize, result);
@ -950,29 +911,21 @@ static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
struct cp210x_comm_status *sts;
struct cp210x_comm_status sts;
int result;
sts = kmalloc(sizeof(*sts), GFP_KERNEL);
if (!sts)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
USB_CTRL_GET_TIMEOUT);
if (result == sizeof(*sts)) {
*count = le32_to_cpu(sts->ulAmountInOutQueue);
result = 0;
} else {
result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
REQTYPE_INTERFACE_TO_HOST, 0,
port_priv->bInterfaceNumber, &sts, sizeof(sts),
USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed to get comm status: %d\n", result);
if (result >= 0)
result = -EIO;
return result;
}
kfree(sts);
*count = le32_to_cpu(sts.ulAmountInOutQueue);
return result;
return 0;
}
static bool cp210x_tx_empty(struct usb_serial_port *port)