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Message-Id: <20210801203122.3515-7-himadrispandya@gmail.com>
Date: Mon, 2 Aug 2021 02:01:22 +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: Himadri Pandya <himadrispandya@...il.com>
Subject: [PATCH v2 6/6] USB: serial: kl5kusb105: use usb_control_msg_recv() and usb_control_msg_send()
The wrappers usb_control_msg_send/recv eliminate the need of allocating
dma buffers for usb message. They also impose proper error checks on the
return value of usb_control_msg() to handle short read/write. Hence use
the wrappers and remove dma allocations.
Signed-off-by: Himadri Pandya <himadrispandya@...il.com>
---
Changes in v2:
- Fix the caller of klsi_105_chg_port_settings()
- Drop unnecessary use of the wrappers
---
drivers/usb/serial/kl5kusb105.c | 79 ++++++++++++++-------------------
1 file changed, 34 insertions(+), 45 deletions(-)
diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index f1e9628a9907..72d3920c9c48 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -124,16 +124,18 @@ static int klsi_105_chg_port_settings(struct usb_serial_port *port,
{
int rc;
- rc = usb_control_msg(port->serial->dev,
- usb_sndctrlpipe(port->serial->dev, 0),
- KL5KUSB105A_SIO_SET_DATA,
- USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
- 0, /* value */
- 0, /* index */
- settings,
- sizeof(struct klsi_105_port_settings),
- KLSI_TIMEOUT);
- if (rc < 0)
+ rc = usb_control_msg_send(port->serial->dev,
+ 0,
+ KL5KUSB105A_SIO_SET_DATA,
+ USB_TYPE_VENDOR | USB_DIR_OUT |
+ USB_RECIP_INTERFACE,
+ 0, /* value */
+ 0, /* index */
+ settings,
+ sizeof(struct klsi_105_port_settings),
+ KLSI_TIMEOUT,
+ GFP_KERNEL);
+ if (rc)
dev_err(&port->dev,
"Change port settings failed (error = %d)\n", rc);
@@ -167,28 +169,21 @@ static int klsi_105_get_line_state(struct usb_serial_port *port,
unsigned long *line_state_p)
{
int rc;
- u8 *status_buf;
+ u8 status_buf[KLSI_STATUSBUF_LEN];
__u16 status;
- status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
- if (!status_buf)
- return -ENOMEM;
-
status_buf[0] = 0xff;
status_buf[1] = 0xff;
- rc = usb_control_msg(port->serial->dev,
- usb_rcvctrlpipe(port->serial->dev, 0),
- KL5KUSB105A_SIO_POLL,
- USB_TYPE_VENDOR | USB_DIR_IN,
- 0, /* value */
- 0, /* index */
- status_buf, KLSI_STATUSBUF_LEN,
- 10000
- );
- if (rc != KLSI_STATUSBUF_LEN) {
+ rc = usb_control_msg_recv(port->serial->dev, 0,
+ KL5KUSB105A_SIO_POLL,
+ USB_TYPE_VENDOR | USB_DIR_IN,
+ 0, /* value */
+ 0, /* index */
+ status_buf, KLSI_STATUSBUF_LEN,
+ 10000,
+ GFP_KERNEL);
+ if (rc) {
dev_err(&port->dev, "reading line status failed: %d\n", rc);
- if (rc >= 0)
- rc = -EIO;
} else {
status = get_unaligned_le16(status_buf);
@@ -198,7 +193,6 @@ static int klsi_105_get_line_state(struct usb_serial_port *port,
*line_state_p = klsi_105_status2linestate(status);
}
- kfree(status_buf);
return rc;
}
@@ -245,7 +239,7 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
int retval = 0;
int rc;
unsigned long line_state;
- struct klsi_105_port_settings *cfg;
+ struct klsi_105_port_settings cfg;
unsigned long flags;
/* Do a defined restart:
@@ -255,27 +249,22 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
* Then read the modem line control and store values in
* priv->line_state.
*/
- cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
- return -ENOMEM;
- cfg->pktlen = 5;
- cfg->baudrate = kl5kusb105a_sio_b9600;
- cfg->databits = kl5kusb105a_dtb_8;
- cfg->unknown1 = 0;
- cfg->unknown2 = 1;
- klsi_105_chg_port_settings(port, cfg);
+ cfg.pktlen = 5;
+ cfg.baudrate = kl5kusb105a_sio_b9600;
+ cfg.databits = kl5kusb105a_dtb_8;
+ cfg.unknown1 = 0;
+ cfg.unknown2 = 1;
+ klsi_105_chg_port_settings(port, &cfg);
spin_lock_irqsave(&priv->lock, flags);
- priv->cfg.pktlen = cfg->pktlen;
- priv->cfg.baudrate = cfg->baudrate;
- priv->cfg.databits = cfg->databits;
- priv->cfg.unknown1 = cfg->unknown1;
- priv->cfg.unknown2 = cfg->unknown2;
+ priv->cfg.pktlen = cfg.pktlen;
+ priv->cfg.baudrate = cfg.baudrate;
+ priv->cfg.databits = cfg.databits;
+ priv->cfg.unknown1 = cfg.unknown1;
+ priv->cfg.unknown2 = cfg.unknown2;
spin_unlock_irqrestore(&priv->lock, flags);
- kfree(cfg);
-
/* READ_ON and urb submission */
rc = usb_serial_generic_open(tty, port);
if (rc)
--
2.17.1
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