tty: use port methods for the rocket driver
Alan Cox [Fri, 2 Jan 2009 13:48:39 +0000 (13:48 +0000)]
Now we have our ducks in order we can begin switching to the port
operations

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/rocket.c
drivers/char/tty_port.c

index b5e5e77..f59fc5c 100644 (file)
@@ -879,108 +879,6 @@ static void raise_dtr_rts(struct tty_port *port)
        sSetRTS(&info->channel);
 }
 
-/*  info->port.count is considered critical, protected by spinlocks.  */
-static int block_til_ready(struct tty_struct *tty, struct file *filp,
-                          struct r_port *info)
-{
-       DECLARE_WAITQUEUE(wait, current);
-       struct tty_port *port = &info->port;
-       int retval;
-       int do_clocal = 0, extra_count = 0;
-       unsigned long flags;
-
-       /*
-        * If the device is in the middle of being closed, then block
-        * until it's done, and then try again.
-        */
-       if (tty_hung_up_p(filp))
-               return ((info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
-       if (info->flags & ASYNC_CLOSING) {
-               if (wait_for_completion_interruptible(&info->close_wait))
-                       return -ERESTARTSYS;
-               return ((info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
-       }
-
-       /*
-        * If non-blocking mode is set, or the port is not enabled,
-        * then make the check up front and then exit.
-        */
-       if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
-               info->port.flags |= ASYNC_NORMAL_ACTIVE;
-               return 0;
-       }
-       if (tty->termios->c_cflag & CLOCAL)
-               do_clocal = 1;
-
-       /*
-        * Block waiting for the carrier detect and the line to become free.  While we are in
-        * this loop, port->count is dropped by one, so that rp_close() knows when to free things.
-         * We restore it upon exit, either normal or abnormal.
-        */
-       retval = 0;
-       add_wait_queue(&port->open_wait, &wait);
-#ifdef ROCKET_DEBUG_OPEN
-       printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, port->count);
-#endif
-       spin_lock_irqsave(&port->lock, flags);
-
-#ifdef ROCKET_DISABLE_SIMUSAGE
-       info->port.flags |= ASYNC_NORMAL_ACTIVE;
-#else
-       if (!tty_hung_up_p(filp)) {
-               extra_count = 1;
-               port->count--;
-       }
-#endif
-       port->blocked_open++;
-
-       spin_unlock_irqrestore(&port->lock, flags);
-
-       while (1) {
-               if (tty->termios->c_cflag & CBAUD)
-                       tty_port_raise_dtr_rts(port);
-               set_current_state(TASK_INTERRUPTIBLE);
-               if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)) {
-                       if (info->port.flags & ASYNC_HUP_NOTIFY)
-                               retval = -EAGAIN;
-                       else
-                               retval = -ERESTARTSYS;
-                       break;
-               }
-               if (!(info->port.flags & ASYNC_CLOSING) &&
-                       (do_clocal || tty_port_carrier_raised(port)))
-                       break;
-               if (signal_pending(current)) {
-                       retval = -ERESTARTSYS;
-                       break;
-               }
-#ifdef ROCKET_DEBUG_OPEN
-               printk(KERN_INFO "block_til_ready blocking: ttyR%d, count = %d, flags=0x%0x\n",
-                    info->line, port->count, info->port.flags);
-#endif
-               schedule();     /*  Don't hold spinlock here, will hang PC */
-       }
-       __set_current_state(TASK_RUNNING);
-       remove_wait_queue(&port->open_wait, &wait);
-
-       spin_lock_irqsave(&port->lock, flags);
-
-       if (extra_count)
-               port->count++;
-       port->blocked_open--;
-
-       spin_unlock_irqrestore(&port->lock, flags);
-
-#ifdef ROCKET_DEBUG_OPEN
-       printk(KERN_INFO "block_til_ready after blocking: ttyR%d, count = %d\n",
-              info->line, port->count);
-#endif
-       if (retval)
-               return retval;
-       info->port.flags |= ASYNC_NORMAL_ACTIVE;
-       return 0;
-}
-
 /*
  *  Exception handler that opens a serial port.  Creates xmit_buf storage, fills in 
  *  port's r_port struct.  Initializes the port hardware.  
@@ -988,24 +886,26 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 static int rp_open(struct tty_struct *tty, struct file *filp)
 {
        struct r_port *info;
+       struct tty_port *port;
        int line = 0, retval;
        CHANNEL_t *cp;
        unsigned long page;
 
        line = tty->index;
-       if ((line < 0) || (line >= MAX_RP_PORTS) || ((info = rp_table[line]) == NULL))
+       if (line < 0 || line >= MAX_RP_PORTS || ((info = rp_table[line]) == NULL))
                return -ENXIO;
-
+       port = &info->port;
+       
        page = __get_free_page(GFP_KERNEL);
        if (!page)
                return -ENOMEM;
 
-       if (info->port.flags & ASYNC_CLOSING) {
+       if (port->flags & ASYNC_CLOSING) {
                retval = wait_for_completion_interruptible(&info->close_wait);
                free_page(page);
                if (retval)
                        return retval;
-               return ((info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
+               return ((port->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
        }
 
        /*
@@ -1017,9 +917,9 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
                info->xmit_buf = (unsigned char *) page;
 
        tty->driver_data = info;
-       tty_port_tty_set(&info->port, tty);
+       tty_port_tty_set(port, tty);
 
-       if (info->port.count++ == 0) {
+       if (port->count++ == 0) {
                atomic_inc(&rp_num_ports_open);
 
 #ifdef ROCKET_DEBUG_OPEN
@@ -1034,7 +934,7 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
        /*
         * Info->count is now 1; so it's safe to sleep now.
         */
-       if ((info->port.flags & ASYNC_INITIALIZED) == 0) {
+       if (!test_bit(ASYNC_INITIALIZED, &port->flags)) {
                cp = &info->channel;
                sSetRxTrigger(cp, TRIG_1);
                if (sGetChanStatus(cp) & CD_ACT)
@@ -1058,7 +958,7 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
                sEnRxFIFO(cp);
                sEnTransmit(cp);
 
-               info->port.flags |= ASYNC_INITIALIZED;
+               set_bit(ASYNC_INITIALIZED, &info->port.flags);
 
                /*
                 * Set up the tty->alt_speed kludge
@@ -1081,7 +981,7 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
        /*  Starts (or resets) the maint polling loop */
        mod_timer(&rocket_timer, jiffies + POLL_PERIOD);
 
-       retval = block_til_ready(tty, filp, info);
+       retval = tty_port_block_til_ready(port, tty, filp);
        if (retval) {
 #ifdef ROCKET_DEBUG_OPEN
                printk(KERN_INFO "rp_open returning after block_til_ready with %d\n", retval);
@@ -1098,7 +998,6 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
 {
        struct r_port *info = tty->driver_data;
        struct tty_port *port = &info->port;
-       unsigned long flags;
        int timeout;
        CHANNEL_t *cp;
        
@@ -1109,53 +1008,10 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
        printk(KERN_INFO "rp_close ttyR%d, count = %d\n", info->line, info->port.count);
 #endif
 
-       if (tty_hung_up_p(filp))
+       if (tty_port_close_start(port, tty, filp) == 0)
                return;
-       spin_lock_irqsave(&port->lock, flags);
-
-       if (tty->count == 1 && port->count != 1) {
-               /*
-                * Uh, oh.  tty->count is 1, which means that the tty
-                * structure will be freed.  Info->count should always
-                * be one in these conditions.  If it's greater than
-                * one, we've got real problems, since it means the
-                * serial port won't be shutdown.
-                */
-               printk(KERN_WARNING "rp_close: bad serial port count; "
-                       "tty->count is 1, info->port.count is %d\n", info->port.count);
-               port->count = 1;
-       }
-       if (--port->count < 0) {
-               printk(KERN_WARNING "rp_close: bad serial port count for "
-                               "ttyR%d: %d\n", info->line, info->port.count);
-               port->count = 0;
-       }
-       if (port->count) {
-               spin_unlock_irqrestore(&port->lock, flags);
-               return;
-       }
-       info->port.flags |= ASYNC_CLOSING;
-       spin_unlock_irqrestore(&port->lock, flags);
 
        cp = &info->channel;
-
-       /*
-        * Notify the line discpline to only process XON/XOFF characters
-        */
-       tty->closing = 1;
-
-       /*
-        * If transmission was throttled by the application request,
-        * just flush the xmit buffer.
-        */
-       if (tty->flow_stopped)
-               rp_flush_buffer(tty);
-
-       /*
-        * Wait for the transmit buffer to clear
-        */
-       if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
-               tty_wait_until_sent(tty, port->closing_wait);
        /*
         * Before we drop DTR, make sure the UART transmitter
         * has completely drained; this is especially
@@ -1184,6 +1040,9 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
 
        clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
 
+       /* We can't yet use tty_port_close_end as the buffer handling in this
+          driver is a bit different to the usual */
+
        if (port->blocked_open) {
                if (port->close_delay) {
                        msleep_interruptible(jiffies_to_msecs(port->close_delay));
@@ -1197,6 +1056,8 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
        }
        info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING | ASYNC_NORMAL_ACTIVE);
        tty->closing = 0;
+       tty_port_tty_set(port, NULL);
+       wake_up_interruptible(&port->close_wait);
        complete_all(&info->close_wait);
        atomic_dec(&rp_num_ports_open);
 
@@ -1659,9 +1520,7 @@ static void rp_hangup(struct tty_struct *tty)
                atomic_dec(&rp_num_ports_open);
        clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
 
-       info->port.count = 0;
-       info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
-       tty_port_tty_set(&info->port, NULL);
+       tty_port_hangup(&info->port);
 
        cp = &info->channel;
        sDisRxFIFO(cp);
index b580fcf..9b8004c 100644 (file)
@@ -286,6 +286,9 @@ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct f
        port->flags |= ASYNC_CLOSING;
        tty->closing = 1;
        spin_unlock_irqrestore(&port->lock, flags);
+       /* Don't block on a stalled port, just pull the chain */
+       if (tty->flow_stopped)
+               tty_driver_flush_buffer(tty);
        if (port->flags & ASYNC_INITIALIZED &&
                        port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, port->closing_wait);