Char: mxser, globals cleanup

- remove unused mxvar_diagflag
- move mxser_msr into the only user/function
- GMStatus, hmm, fix race-prone access to it. We need only one instance for
  real, not MXSER_PORTS. Move it to MOXA_GETMSTATUS ioctl.
- mxser_mon_ext, almost the same, but alloc it on heap, since it has more than
  2 kilos.
- fix indexing, `i' is not the index value, `i * MXSER_PORTS_PER_BOARD + j' is

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 55 insertions, 75 deletions

diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index e5029b149c5..3d7f2a97049 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -286,8 +286,6 @@ struct mxser_mstatus {
         int dcd;
 };
 
-static struct mxser_mstatus GMStatus[MXSER_PORTS];
-
 static int mxserBoardCAP[MXSER_BOARDS] = {
         0, 0, 0, 0
         /*  0x180, 0x280, 0x200, 0x320 */
@@ -296,9 +294,6 @@ static int mxserBoardCAP[MXSER_BOARDS] = {
 static struct mxser_board mxser_boards[MXSER_BOARDS];
 static struct tty_driver *mxvar_sdriver;
 static struct mxser_log mxvar_log;
-static int mxvar_diagflag;
-static unsigned char mxser_msr[MXSER_PORTS + 1];
-static struct mxser_mon_ext mon_data_ext;
 static int mxser_set_baud_method[MXSER_PORTS + 1];
 
 static void mxser_enable_must_enchance_mode(unsigned long baseio)
@@ -542,6 +537,7 @@ static void process_txrx_fifo(struct mxser_port *info)
 
 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 {
+        static unsigned char mxser_msr[MXSER_PORTS + 1];
         unsigned char status = 0;
 
         status = inb(baseaddr + UART_MSR);
@@ -1652,62 +1648,60 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
                         ret = -EFAULT;
                 unlock_kernel();
                 return ret;
-        case MOXA_GETMSTATUS:
+        case MOXA_GETMSTATUS: {
+                struct mxser_mstatus ms, __user *msu = argp;
                 lock_kernel();
                 for (i = 0; i < MXSER_BOARDS; i++)
                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
                                 port = &mxser_boards[i].ports[j];
+                                memset(&ms, 0, sizeof(ms));
 
-                                GMStatus[i].ri = 0;
-                                if (!port->ioaddr) {
-                                        GMStatus[i].dcd = 0;
-                                        GMStatus[i].dsr = 0;
-                                        GMStatus[i].cts = 0;
-                                        continue;
-                                }
+                                if (!port->ioaddr)
+                                        goto copy;
 
                                 if (!port->port.tty || !port->port.tty->termios)
-                                        GMStatus[i].cflag =
-                                                port->normal_termios.c_cflag;
+                                        ms.cflag = port->normal_termios.c_cflag;
                                 else
-                                        GMStatus[i].cflag =
-                                                port->port.tty->termios->c_cflag;
+                                        ms.cflag = port->port.tty->termios->c_cflag;
 
                                 status = inb(port->ioaddr + UART_MSR);
-                                if (status & 0x80 /*UART_MSR_DCD */ )
-                                        GMStatus[i].dcd = 1;
-                                else
-                                        GMStatus[i].dcd = 0;
-
-                                if (status & 0x20 /*UART_MSR_DSR */ )
-                                        GMStatus[i].dsr = 1;
-                                else
-                                        GMStatus[i].dsr = 0;
-
-
-                                if (status & 0x10 /*UART_MSR_CTS */ )
-                                        GMStatus[i].cts = 1;
-                                else
-                                        GMStatus[i].cts = 0;
+                                if (status & UART_MSR_DCD)
+                                        ms.dcd = 1;
+                                if (status & UART_MSR_DSR)
+                                        ms.dsr = 1;
+                                if (status & UART_MSR_CTS)
+                                        ms.cts = 1;
+                        copy:
+                                if (copy_to_user(msu, &ms, sizeof(ms))) {
+                                        unlock_kernel();
+                                        return -EFAULT;
+                                }
+                                msu++;
                         }
                 unlock_kernel();
-                if (copy_to_user(argp, GMStatus,
-                                sizeof(struct mxser_mstatus) * MXSER_PORTS))
-                        return -EFAULT;
                 return 0;
+        }
         case MOXA_ASPP_MON_EXT: {
-                int p, shiftbit;
-                unsigned long opmode;
-                unsigned cflag, iflag;
+                struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
+                unsigned int cflag, iflag, p;
+                u8 opmode;
+
+                me = kzalloc(sizeof(*me), GFP_KERNEL);
+                if (!me)
+                        return -ENOMEM;
 
                 lock_kernel();
-                for (i = 0; i < MXSER_BOARDS; i++) {
-                        for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
+                for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
+                        for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
+                                if (p >= ARRAY_SIZE(me->rx_cnt)) {
+                                        i = MXSER_BOARDS;
+                                        break;
+                                }
                                 port = &mxser_boards[i].ports[j];
                                 if (!port->ioaddr)
                                         continue;
 
-                                status = mxser_get_msr(port->ioaddr, 0, i);
+                                status = mxser_get_msr(port->ioaddr, 0, p);
 
                                 if (status & UART_MSR_TERI)
                                         port->icount.rng++;
@@ -1719,16 +1713,13 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
                                         port->icount.cts++;
 
                                 port->mon_data.modem_status = status;
-                                mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
-                                mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
-                                mon_data_ext.up_rxcnt[i] =
-                                        port->mon_data.up_rxcnt;
-                                mon_data_ext.up_txcnt[i] =
-                                        port->mon_data.up_txcnt;
-                                mon_data_ext.modem_status[i] =
+                                me->rx_cnt[p] = port->mon_data.rxcnt;
+                                me->tx_cnt[p] = port->mon_data.txcnt;
+                                me->up_rxcnt[p] = port->mon_data.up_rxcnt;
+                                me->up_txcnt[p] = port->mon_data.up_txcnt;
+                                me->modem_status[p] =
                                         port->mon_data.modem_status;
-                                mon_data_ext.baudrate[i] =
-                                        tty_get_baud_rate(port->port.tty);
+                                me->baudrate[p] = tty_get_baud_rate(port->port.tty);
 
                                 if (!port->port.tty || !port->port.tty->termios) {
                                         cflag = port->normal_termios.c_cflag;
@@ -1738,40 +1729,31 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
                                         iflag = port->port.tty->termios->c_iflag;
                                 }
 
-                                mon_data_ext.databits[i] = cflag & CSIZE;
-
-                                mon_data_ext.stopbits[i] = cflag & CSTOPB;
-
-                                mon_data_ext.parity[i] =
-                                        cflag & (PARENB | PARODD | CMSPAR);
-
-                                mon_data_ext.flowctrl[i] = 0x00;
+                                me->databits[p] = cflag & CSIZE;
+                                me->stopbits[p] = cflag & CSTOPB;
+                                me->parity[p] = cflag & (PARENB | PARODD |
+                                                CMSPAR);
 
                                 if (cflag & CRTSCTS)
-                                        mon_data_ext.flowctrl[i] |= 0x03;
+                                        me->flowctrl[p] |= 0x03;
 
                                 if (iflag & (IXON | IXOFF))
-                                        mon_data_ext.flowctrl[i] |= 0x0C;
+                                        me->flowctrl[p] |= 0x0C;
 
                                 if (port->type == PORT_16550A)
-                                        mon_data_ext.fifo[i] = 1;
-                                else
-                                        mon_data_ext.fifo[i] = 0;
+                                        me->fifo[p] = 1;
 
-                                p = i % 4;
-                                shiftbit = p * 2;
-                                opmode = inb(port->opmode_ioaddr) >> shiftbit;
+                                opmode = inb(port->opmode_ioaddr) >>
+                                                ((p % 4) * 2);
                                 opmode &= OP_MODE_MASK;
-
-                                mon_data_ext.iftype[i] = opmode;
-
+                                me->iftype[p] = opmode;
                         }
                 }
                 unlock_kernel();
-                if (copy_to_user(argp, &mon_data_ext,
-                                        sizeof(mon_data_ext)))
-                        return -EFAULT;
-                return 0;
+                if (copy_to_user(argp, me, sizeof(*me)))
+                        ret = -EFAULT;
+                kfree(me);
+                return ret;
         }
         default:
                 return -ENOIOCTLCMD;
@@ -2802,8 +2784,6 @@ static int __init mxser_module_init(void)
                 goto err_put;
         }
 
-        mxvar_diagflag = 0;
-
         m = 0;
         /* Start finding ISA boards here */
         for (isaloop = 0; isaloop < 2; isaloop++)