My distro kernel (Fedora Rawhide) started throwing warnings from DMA API
checker, so I have no choice but band-aid it quick. There's no attempt
to reuse DMA buffers. Control messages are only sent rarely anyway.
Signed-off-by: Pete Zaitcev <zaitcev@xxxxxxxxxx>
---
drivers/usb/serial/mct_u232.c | 55 +++++++++++++++++++++++++-------
drivers/usb/serial/mct_u232.h | 2 +
2 files changed, 46 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index cd009cb..70ee7d8 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -75,6 +75,7 @@
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
+#include <asm/unaligned.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "mct_u232.h"
@@ -231,19 +232,22 @@ static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
static int mct_u232_set_baud_rate(struct tty_struct *tty,
struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
{
- __le32 divisor;
+ unsigned int divisor;
int rc;
- unsigned char zero_byte = 0;
+ unsigned char *buf;
unsigned char cts_enable_byte = 0;
speed_t speed;
- divisor = cpu_to_le32(mct_u232_calculate_baud_rate(serial, value,
- &speed));
+ buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+ divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
+ put_unaligned_le32(cpu_to_le32(divisor), buf);
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_BAUD_RATE_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
- 0, 0, &divisor, MCT_U232_SET_BAUD_RATE_SIZE,
+ 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
WDR_TIMEOUT);
if (rc < 0) /*FIXME: What value speed results */
dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
@@ -269,10 +273,11 @@ static int mct_u232_set_baud_rate(struct tty_struct *tty,
a device which is not asserting 'CTS'.
*/
+ buf[0] = 0;
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_UNKNOWN1_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
- 0, 0, &zero_byte, MCT_U232_SET_UNKNOWN1_SIZE,
+ 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
WDR_TIMEOUT);
if (rc < 0)
dev_err(&port->dev, "Sending USB device request code %d "
@@ -284,30 +289,40 @@ static int mct_u232_set_baud_rate(struct tty_struct *tty,
dbg("set_baud_rate: send second control message, data = %02X",
cts_enable_byte);
+ buf[0] = cts_enable_byte;
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_CTS_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
- 0, 0, &cts_enable_byte, MCT_U232_SET_CTS_SIZE,
+ 0, 0, buf, MCT_U232_SET_CTS_SIZE,
WDR_TIMEOUT);
if (rc < 0)
dev_err(&port->dev, "Sending USB device request code %d "
"failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
+ kfree(buf);
return rc;
} /* mct_u232_set_baud_rate */
static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
{
int rc;
+ unsigned char *buf;
+
+ buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+
+ buf[0] = lcr;
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_LINE_CTRL_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
- 0, 0, &lcr, MCT_U232_SET_LINE_CTRL_SIZE,
+ 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
WDR_TIMEOUT);
if (rc < 0)
dev_err(&serial->dev->dev,
"Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
dbg("set_line_ctrl: 0x%x", lcr);
+ kfree(buf);
return rc;
} /* mct_u232_set_line_ctrl */
@@ -315,23 +330,31 @@ static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
unsigned int control_state)
{
int rc;
- unsigned char mcr = MCT_U232_MCR_NONE;
+ unsigned char mcr;
+ unsigned char *buf;
+ buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+
+ mcr = MCT_U232_MCR_NONE;
if (control_state & TIOCM_DTR)
mcr |= MCT_U232_MCR_DTR;
if (control_state & TIOCM_RTS)
mcr |= MCT_U232_MCR_RTS;
+ buf[0] = mcr;
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_MODEM_CTRL_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
- 0, 0, &mcr, MCT_U232_SET_MODEM_CTRL_SIZE,
+ 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
WDR_TIMEOUT);
if (rc < 0)
dev_err(&serial->dev->dev,
"Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
+ kfree(buf);
return rc;
} /* mct_u232_set_modem_ctrl */
@@ -339,17 +362,27 @@ static int mct_u232_get_modem_stat(struct usb_serial *serial,
unsigned char *msr)
{
int rc;
+ unsigned char *buf;
+
+ buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
+ if (buf == NULL) {
+ *msr = 0;
+ return -ENOMEM;
+ }
rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
MCT_U232_GET_MODEM_STAT_REQUEST,
MCT_U232_GET_REQUEST_TYPE,
- 0, 0, msr, MCT_U232_GET_MODEM_STAT_SIZE,
+ 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
WDR_TIMEOUT);
if (rc < 0) {
dev_err(&serial->dev->dev,
"Get MODEM STATus failed (error = %d)\n", rc);
*msr = 0;
+ } else {
+ *msr = buf[0];
}
dbg("get_modem_stat: 0x%x", *msr);
+ kfree(buf);
return rc;
} /* mct_u232_get_modem_stat */
diff --git a/drivers/usb/serial/mct_u232.h b/drivers/usb/serial/mct_u232.h
index 07b6bec..7417d5c 100644
--- a/drivers/usb/serial/mct_u232.h
+++ b/drivers/usb/serial/mct_u232.h
@@ -73,6 +73,8 @@
#define MCT_U232_SET_CTS_REQUEST 12
#define MCT_U232_SET_CTS_SIZE 1
+#define MCT_U232_MAX_SIZE 4 /* of MCT_XXX_SIZE */
+
/*
* Baud rate (divisor)
* Actually, there are two of them, MCT website calls them "Philips solution"
--
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