Char: riscom8, remove wakeup and hangup bottomhalves
Jiri Slaby [Thu, 7 Feb 2008 08:16:41 +0000 (00:16 -0800)]
Both of them may be called directly from the code, don't add special code
and variables and schedule a work for them.

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>

drivers/char/riscom8.c
drivers/char/riscom8.h

index 9b19abf..8fc4fe4 100644 (file)
@@ -78,8 +78,6 @@
         ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
         ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
 
-#define RS_EVENT_WRITE_WAKEUP  0
-
 static struct tty_driver *riscom_driver;
 
 static DEFINE_SPINLOCK(riscom_lock);
@@ -314,12 +312,6 @@ out_release:
  * 
  */
 
-static inline void rc_mark_event(struct riscom_port * port, int event)
-{
-       set_bit(event, &port->event);
-       schedule_work(&port->tqueue);
-}
-
 static inline struct riscom_port * rc_get_port(struct riscom_board const * bp,
                                               unsigned char const * what)
 {
@@ -486,7 +478,7 @@ static inline void rc_transmit(struct riscom_board const * bp)
                rc_out(bp, CD180_IER, port->IER);
        }
        if (port->xmit_cnt <= port->wakeup_chars)
-               rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+               tty_wakeup(tty);
 }
 
 static inline void rc_check_modem(struct riscom_board const * bp)
@@ -505,7 +497,7 @@ static inline void rc_check_modem(struct riscom_board const * bp)
                if (rc_in(bp, CD180_MSVR) & MSVR_CD) 
                        wake_up_interruptible(&port->open_wait);
                else
-                       schedule_work(&port->tqueue_hangup);
+                       tty_hangup(tty);
        }
        
 #ifdef RISCOM_BRAIN_DAMAGED_CTS
@@ -514,7 +506,7 @@ static inline void rc_check_modem(struct riscom_board const * bp)
                        tty->hw_stopped = 0;
                        port->IER |= IER_TXRDY;
                        if (port->xmit_cnt <= port->wakeup_chars)
-                               rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+                               tty_wakeup(tty);
                } else  {
                        tty->hw_stopped = 1;
                        port->IER &= ~IER_TXRDY;
@@ -526,7 +518,7 @@ static inline void rc_check_modem(struct riscom_board const * bp)
                        tty->hw_stopped = 0;
                        port->IER |= IER_TXRDY;
                        if (port->xmit_cnt <= port->wakeup_chars)
-                               rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+                               tty_wakeup(tty);
                } else  {
                        tty->hw_stopped = 1;
                        port->IER &= ~IER_TXRDY;
@@ -1091,7 +1083,6 @@ static void rc_close(struct tty_struct * tty, struct file * filp)
        tty_ldisc_flush(tty);
 
        tty->closing = 0;
-       port->event = 0;
        port->tty = NULL;
        if (port->blocked_open) {
                if (port->close_delay) {
@@ -1526,25 +1517,6 @@ static void rc_start(struct tty_struct * tty)
        spin_unlock_irqrestore(&riscom_lock, flags);
 }
 
-/*
- * This routine is called from the work queue when the interrupt
- * routine has signalled that a hangup has occurred.  The path of
- * hangup processing is:
- *
- *     serial interrupt routine -> (workqueue) ->
- *     do_rc_hangup() -> tty->hangup() -> rc_hangup()
- * 
- */
-static void do_rc_hangup(struct work_struct *ugly_api)
-{
-       struct riscom_port      *port = container_of(ugly_api, struct riscom_port, tqueue_hangup);
-       struct tty_struct       *tty;
-       
-       tty = port->tty;
-       if (tty)
-               tty_hangup(tty);        /* FIXME: module removal race still here */
-}
-
 static void rc_hangup(struct tty_struct * tty)
 {
        struct riscom_port *port = (struct riscom_port *)tty->driver_data;
@@ -1556,7 +1528,6 @@ static void rc_hangup(struct tty_struct * tty)
        bp = port_Board(port);
        
        rc_shutdown_port(bp, port);
-       port->event = 0;
        port->count = 0;
        port->flags &= ~ASYNC_NORMAL_ACTIVE;
        port->tty = NULL;
@@ -1586,18 +1557,6 @@ static void rc_set_termios(struct tty_struct * tty, struct ktermios * old_termio
        }
 }
 
-static void do_softint(struct work_struct *ugly_api)
-{
-       struct riscom_port      *port = container_of(ugly_api, struct riscom_port, tqueue);
-       struct tty_struct       *tty;
-       
-       if(!(tty = port->tty)) 
-               return;
-
-       if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event))
-               tty_wakeup(tty);
-}
-
 static const struct tty_operations riscom_ops = {
        .open  = rc_open,
        .close = rc_close,
@@ -1650,8 +1609,6 @@ static int __init rc_init_drivers(void)
        memset(rc_port, 0, sizeof(rc_port));
        for (i = 0; i < RC_NPORT * RC_NBOARD; i++)  {
                rc_port[i].magic = RISCOM8_MAGIC;
-               INIT_WORK(&rc_port[i].tqueue, do_softint);
-               INIT_WORK(&rc_port[i].tqueue_hangup, do_rc_hangup);
                rc_port[i].close_delay = 50 * HZ/100;
                rc_port[i].closing_wait = 3000 * HZ/100;
                init_waitqueue_head(&rc_port[i].open_wait);
index 9cc1313..cdfdf43 100644 (file)
@@ -71,7 +71,6 @@ struct riscom_port {
        struct tty_struct       * tty;
        int                     count;
        int                     blocked_open;
-       unsigned long           event; /* long req'd for set_bit --RR */
        int                     timeout;
        int                     close_delay;
        unsigned char           * xmit_buf;
@@ -81,8 +80,6 @@ struct riscom_port {
        int                     xmit_cnt;
        wait_queue_head_t       open_wait;
        wait_queue_head_t       close_wait;
-       struct work_struct      tqueue;
-       struct work_struct      tqueue_hangup;
        short                   wakeup_chars;
        short                   break_length;
        unsigned short          closing_wait;