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hc
2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd 
 kernel/drivers/tty/mxser.c
....@@ -638,16 +638,15 @@
638638  * This routine is called to set the UART divisor registers to match
639639  * the specified baud rate for a serial port.
640640  */
641
-static int mxser_change_speed(struct tty_struct *tty)
641
+static void mxser_change_speed(struct tty_struct *tty)
642642 {
643643 	struct mxser_port *info = tty->driver_data;
644644 	unsigned cflag, cval, fcr;
645
-	int ret = 0;
646645 	unsigned char status;
647646 
648647 	cflag = tty->termios.c_cflag;
649648 	if (!info->ioaddr)
650
-		return ret;
649
+		return;
651650 
652651 	if (mxser_set_baud_method[tty->index] == 0)
653652 		mxser_set_baud(tty, tty_get_baud_rate(tty));
....@@ -803,8 +802,6 @@
803802 
804803 	outb(fcr, info->ioaddr + UART_FCR);	/* set fcr */
805804 	outb(cval, info->ioaddr + UART_LCR);
806
-
807
-	return ret;
808805 }
809806 
810807 static void mxser_check_modem_status(struct tty_struct *tty,
....@@ -861,6 +858,7 @@
861858 	struct mxser_port *info = container_of(port, struct mxser_port, port);
862859 	unsigned long page;
863860 	unsigned long flags;
861
+	int ret;
864862 
865863 	page = __get_free_page(GFP_KERNEL);
866864 	if (!page)
....@@ -870,9 +868,9 @@
870868 
871869 	if (!info->ioaddr || !info->type) {
872870 		set_bit(TTY_IO_ERROR, &tty->flags);
873
-		free_page(page);
874871 		spin_unlock_irqrestore(&info->slock, flags);
875
-		return 0;
872
+		ret = 0;
873
+		goto err_free_xmit;
876874 	}
877875 	info->port.xmit_buf = (unsigned char *) page;
878876 
....@@ -898,8 +896,10 @@
898896 		if (capable(CAP_SYS_ADMIN)) {
899897 			set_bit(TTY_IO_ERROR, &tty->flags);
900898 			return 0;
901
-		} else
902
-			return -ENODEV;
899
+		}
900
+
901
+		ret = -ENODEV;
902
+		goto err_free_xmit;
903903 	}
904904 
905905 	/*
....@@ -944,6 +944,10 @@
944944 	spin_unlock_irqrestore(&info->slock, flags);
945945 
946946 	return 0;
947
+err_free_xmit:
948
+	free_page(page);
949
+	info->port.xmit_buf = NULL;
950
+	return ret;
947951 }
948952 
949953 /*
....@@ -1207,76 +1211,90 @@
12071211  * ------------------------------------------------------------
12081212  */
12091213 static int mxser_get_serial_info(struct tty_struct *tty,
1210
-		struct serial_struct __user *retinfo)
1214
+		struct serial_struct *ss)
12111215 {
12121216 	struct mxser_port *info = tty->driver_data;
1213
-	struct serial_struct tmp = {
1214
-		.type = info->type,
1215
-		.line = tty->index,
1216
-		.port = info->ioaddr,
1217
-		.irq = info->board->irq,
1218
-		.flags = info->port.flags,
1219
-		.baud_base = info->baud_base,
1220
-		.close_delay = info->port.close_delay,
1221
-		.closing_wait = info->port.closing_wait,
1222
-		.custom_divisor = info->custom_divisor,
1223
-	};
1224
-	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1225
-		return -EFAULT;
1217
+	struct tty_port *port = &info->port;
1218
+
1219
+	if (tty->index == MXSER_PORTS)
1220
+		return -ENOTTY;
1221
+
1222
+	mutex_lock(&port->mutex);
1223
+	ss->type = info->type,
1224
+	ss->line = tty->index,
1225
+	ss->port = info->ioaddr,
1226
+	ss->irq = info->board->irq,
1227
+	ss->flags = info->port.flags,
1228
+	ss->baud_base = info->baud_base,
1229
+	ss->close_delay = info->port.close_delay,
1230
+	ss->closing_wait = info->port.closing_wait,
1231
+	ss->custom_divisor = info->custom_divisor,
1232
+	mutex_unlock(&port->mutex);
12261233 	return 0;
12271234 }
12281235 
12291236 static int mxser_set_serial_info(struct tty_struct *tty,
1230
-		struct serial_struct __user *new_info)
1237
+		struct serial_struct *ss)
12311238 {
12321239 	struct mxser_port *info = tty->driver_data;
12331240 	struct tty_port *port = &info->port;
1234
-	struct serial_struct new_serial;
12351241 	speed_t baud;
12361242 	unsigned long sl_flags;
12371243 	unsigned int flags;
12381244 	int retval = 0;
12391245 
1240
-	if (!new_info || !info->ioaddr)
1241
-		return -ENODEV;
1242
-	if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1243
-		return -EFAULT;
1246
+	if (tty->index == MXSER_PORTS)
1247
+		return -ENOTTY;
1248
+	if (tty_io_error(tty))
1249
+		return -EIO;
12441250 
1245
-	if (new_serial.irq != info->board->irq ||
1246
-			new_serial.port != info->ioaddr)
1251
+	mutex_lock(&port->mutex);
1252
+	if (!info->ioaddr) {
1253
+		mutex_unlock(&port->mutex);
1254
+		return -ENODEV;
1255
+	}
1256
+
1257
+	if (ss->irq != info->board->irq ||
1258
+			ss->port != info->ioaddr) {
1259
+		mutex_unlock(&port->mutex);
12471260 		return -EINVAL;
1261
+	}
12481262 
12491263 	flags = port->flags & ASYNC_SPD_MASK;
12501264 
12511265 	if (!capable(CAP_SYS_ADMIN)) {
1252
-		if ((new_serial.baud_base != info->baud_base) ||
1253
-				(new_serial.close_delay != info->port.close_delay) ||
1254
-				((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1266
+		if ((ss->baud_base != info->baud_base) ||
1267
+				(ss->close_delay != info->port.close_delay) ||
1268
+				((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) {
1269
+			mutex_unlock(&port->mutex);
12551270 			return -EPERM;
1271
+		}
12561272 		info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1257
-				(new_serial.flags & ASYNC_USR_MASK));
1273
+				(ss->flags & ASYNC_USR_MASK));
12581274 	} else {
12591275 		/*
12601276 		 * OK, past this point, all the error checking has been done.
12611277 		 * At this point, we start making changes.....
12621278 		 */
12631279 		port->flags = ((port->flags & ~ASYNC_FLAGS) |
1264
-				(new_serial.flags & ASYNC_FLAGS));
1265
-		port->close_delay = new_serial.close_delay * HZ / 100;
1266
-		port->closing_wait = new_serial.closing_wait * HZ / 100;
1280
+				(ss->flags & ASYNC_FLAGS));
1281
+		port->close_delay = ss->close_delay * HZ / 100;
1282
+		port->closing_wait = ss->closing_wait * HZ / 100;
12671283 		port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
12681284 		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1269
-				(new_serial.baud_base != info->baud_base ||
1270
-				new_serial.custom_divisor !=
1285
+				(ss->baud_base != info->baud_base ||
1286
+				ss->custom_divisor !=
12711287 				info->custom_divisor)) {
1272
-			if (new_serial.custom_divisor == 0)
1288
+			if (ss->custom_divisor == 0) {
1289
+				mutex_unlock(&port->mutex);
12731290 				return -EINVAL;
1274
-			baud = new_serial.baud_base / new_serial.custom_divisor;
1291
+			}
1292
+			baud = ss->baud_base / ss->custom_divisor;
12751293 			tty_encode_baud_rate(tty, baud, baud);
12761294 		}
12771295 	}
12781296 
1279
-	info->type = new_serial.type;
1297
+	info->type = ss->type;
12801298 
12811299 	process_txrx_fifo(info);
12821300 
....@@ -1291,6 +1309,7 @@
12911309 		if (retval == 0)
12921310 			tty_port_set_initialized(port, 1);
12931311 	}
1312
+	mutex_unlock(&port->mutex);
12941313 	return retval;
12951314 }
12961315 
....@@ -1660,11 +1679,9 @@
16601679 		unsigned int cmd, unsigned long arg)
16611680 {
16621681 	struct mxser_port *info = tty->driver_data;
1663
-	struct tty_port *port = &info->port;
16641682 	struct async_icount cnow;
16651683 	unsigned long flags;
16661684 	void __user *argp = (void __user *)arg;
1667
-	int retval;
16681685 
16691686 	if (tty->index == MXSER_PORTS)
16701687 		return mxser_ioctl_special(cmd, argp);
....@@ -1708,20 +1725,10 @@
17081725 		return 0;
17091726 	}
17101727 
1711
-	if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && tty_io_error(tty))
1728
+	if (cmd != TIOCMIWAIT && tty_io_error(tty))
17121729 		return -EIO;
17131730 
17141731 	switch (cmd) {
1715
-	case TIOCGSERIAL:
1716
-		mutex_lock(&port->mutex);
1717
-		retval = mxser_get_serial_info(tty, argp);
1718
-		mutex_unlock(&port->mutex);
1719
-		return retval;
1720
-	case TIOCSSERIAL:
1721
-		mutex_lock(&port->mutex);
1722
-		retval = mxser_set_serial_info(tty, argp);
1723
-		mutex_unlock(&port->mutex);
1724
-		return retval;
17251732 	case TIOCSERGETLSR:	/* Get line status register */
17261733 		return  mxser_get_lsr_info(info, argp);
17271734 		/*
....@@ -2325,6 +2332,8 @@
23252332 	.wait_until_sent = mxser_wait_until_sent,
23262333 	.tiocmget = mxser_tiocmget,
23272334 	.tiocmset = mxser_tiocmset,
2335
+	.set_serial = mxser_set_serial_info,
2336
+	.get_serial = mxser_get_serial_info,
23282337 	.get_icount = mxser_get_icount,
23292338 };
23302339