be2net: bug fix for flashing the BladeEngine3 ASIC

[safe/jmp/linux-2.6] / drivers / char / moxa.c

diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index d180aa9..63ee3bb 100644 (file)
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -34,7 +34,6 @@
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/major.h>
-#include <linux/smp_lock.h>
 #include <linux/string.h>
 #include <linux/fcntl.h>
 #include <linux/ptrace.h>
@@ -139,7 +138,7 @@ struct moxa_port {
        int cflag;
        unsigned long statusflags;
 
-       u8 DCDState;
+       u8 DCDState;            /* Protected by the port lock */
        u8 lineCtrl;
        u8 lowChkFlag;
 };
@@ -164,6 +163,7 @@ static struct mon_str moxaLog;
 static unsigned int moxaFuncTout = HZ / 2;
 static unsigned int moxaLowWaterChk;
 static DEFINE_MUTEX(moxa_openlock);
+static DEFINE_SPINLOCK(moxa_lock);
 /* Variables for insmod */
 #ifdef MODULE
 static unsigned long baseaddr[MAX_BOARDS];
@@ -202,7 +202,6 @@ static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
                         unsigned int set, unsigned int clear);
 static void moxa_poll(unsigned long);
 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
-static void moxa_setup_empty_event(struct tty_struct *);
 static void moxa_shutdown(struct tty_port *);
 static int moxa_carrier_raised(struct tty_port *);
 static void moxa_dtr_rts(struct tty_port *, int);
@@ -315,22 +314,20 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file,
                struct moxa_port *p;
                unsigned int i, j;
 
-               mutex_lock(&moxa_openlock);
                for (i = 0; i < MAX_BOARDS; i++) {
                        p = moxa_boards[i].ports;
                        for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
                                memset(&tmp, 0, sizeof(tmp));
+                               spin_lock_bh(&moxa_lock);
                                if (moxa_boards[i].ready) {
                                        tmp.inq = MoxaPortRxQueue(p);
                                        tmp.outq = MoxaPortTxQueue(p);
                                }
-                               if (copy_to_user(argm, &tmp, sizeof(tmp))) {
-                                       mutex_unlock(&moxa_openlock);
+                               spin_unlock_bh(&moxa_lock);
+                               if (copy_to_user(argm, &tmp, sizeof(tmp)))
                                        return -EFAULT;
-                               }
                        }
                }
-               mutex_unlock(&moxa_openlock);
                break;
        } case MOXA_GET_OQUEUE:
                status = MoxaPortTxQueue(ch);
@@ -346,16 +343,20 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file,
                struct moxa_port *p;
                unsigned int i, j;
 
-               mutex_lock(&moxa_openlock);
                for (i = 0; i < MAX_BOARDS; i++) {
                        p = moxa_boards[i].ports;
                        for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
                                struct tty_struct *ttyp;
                                memset(&tmp, 0, sizeof(tmp));
-                               if (!moxa_boards[i].ready)
+                               spin_lock_bh(&moxa_lock);
+                               if (!moxa_boards[i].ready) {
+                                       spin_unlock_bh(&moxa_lock);
                                        goto copy;
+                                }
 
                                status = MoxaPortLineStatus(p);
+                               spin_unlock_bh(&moxa_lock);
+
                                if (status & 1)
                                        tmp.cts = 1;
                                if (status & 2)
@@ -370,13 +371,10 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file,
                                        tmp.cflag = ttyp->termios->c_cflag;
                                tty_kref_put(tty);
 copy:
-                               if (copy_to_user(argm, &tmp, sizeof(tmp))) {
-                                       mutex_unlock(&moxa_openlock);
+                               if (copy_to_user(argm, &tmp, sizeof(tmp)))
                                        return -EFAULT;
-                               }
                        }
                }
-               mutex_unlock(&moxa_openlock);
                break;
        }
        case TIOCGSERIAL:
@@ -429,7 +427,6 @@ static const struct tty_port_operations moxa_port_ops = {
 
 static struct tty_driver *moxaDriver;
 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
-static DEFINE_SPINLOCK(moxa_lock);
 
 /*
  * HW init
@@ -1141,9 +1138,9 @@ static int moxa_carrier_raised(struct tty_port *port)
        struct moxa_port *ch = container_of(port, struct moxa_port, port);
        int dcd;
 
-       spin_lock_bh(&moxa_lock);
+       spin_lock_irq(&port->lock);
        dcd = ch->DCDState;
-       spin_unlock_bh(&moxa_lock);
+       spin_unlock_irq(&port->lock);
        return dcd;
 }
 
@@ -1251,32 +1248,21 @@ static int moxa_chars_in_buffer(struct tty_struct *tty)
        struct moxa_port *ch = tty->driver_data;
        int chars;
 
-       lock_kernel();
        chars = MoxaPortTxQueue(ch);
-       if (chars) {
+       if (chars)
                /*
                 * Make it possible to wakeup anything waiting for output
                 * in tty_ioctl.c, etc.
                 */
-               if (!test_bit(EMPTYWAIT, &ch->statusflags))
-                       moxa_setup_empty_event(tty);
-       }
-       unlock_kernel();
+               set_bit(EMPTYWAIT, &ch->statusflags);
        return chars;
 }
 
 static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
 {
-       struct moxa_port *ch;
+       struct moxa_port *ch = tty->driver_data;
        int flag = 0, dtr, rts;
 
-       mutex_lock(&moxa_openlock);
-       ch = tty->driver_data;
-       if (!ch) {
-               mutex_unlock(&moxa_openlock);
-               return -EINVAL;
-       }
-
        MoxaPortGetLineOut(ch, &dtr, &rts);
        if (dtr)
                flag |= TIOCM_DTR;
@@ -1289,7 +1275,6 @@ static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
                flag |= TIOCM_DSR;
        if (dtr & 4)
                flag |= TIOCM_CD;
-       mutex_unlock(&moxa_openlock);
        return flag;
 }
 
@@ -1368,15 +1353,20 @@ static void moxa_hangup(struct tty_struct *tty)
 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
 {
        struct tty_struct *tty;
+       unsigned long flags;
        dcd = !!dcd;
 
+       spin_lock_irqsave(&p->port.lock, flags);
        if (dcd != p->DCDState) {
+               p->DCDState = dcd;
+               spin_unlock_irqrestore(&p->port.lock, flags);
                tty = tty_port_tty_get(&p->port);
                if (tty && C_CLOCAL(tty) && !dcd)
                        tty_hangup(tty);
                tty_kref_put(tty);
        }
-       p->DCDState = dcd;
+       else
+               spin_unlock_irqrestore(&p->port.lock, flags);
 }
 
 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
@@ -1506,12 +1496,6 @@ static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_term
        tty_encode_baud_rate(tty, baud, baud);
 }
 
-static void moxa_setup_empty_event(struct tty_struct *tty)
-{
-       struct moxa_port *ch = tty->driver_data;
-       set_bit(EMPTYWAIT, &ch->statusflags);
-}
-
 /*****************************************************************************
  *     Driver level functions:                                              *
  *****************************************************************************/
@@ -1878,9 +1862,7 @@ static int MoxaPortLineStatus(struct moxa_port *port)
        val &= 0x0B;
        if (val & 8)
                val |= 4;
-       spin_lock_bh(&moxa_lock);
        moxa_new_dcdstate(port, val & 8);
-       spin_unlock_bh(&moxa_lock);
        val &= 7;
        return val;
 }