USB: serial mct_usb232: move DMA buffers to heap

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@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 46 insertions, 11 deletions

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index cd009cb280a5..86503831ad3f 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 07b6bec31dc8..7417d5ce1e23 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"