[PATCH] Char: isicom, eliminate spinlock recursion

Many spinlock recursion was in the isicom driver.  Eliminate it.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 5a747e6..01084ab 100644 (file)
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -230,6 +230,20 @@ static struct isi_port  isi_ports[PORT_COUNT];
  *     it wants to talk.
  */
 
+static inline int WaitTillCardIsFree(u16 base)
+{
+       unsigned int count = 0;
+       unsigned int a = in_atomic(); /* do we run under spinlock? */
+
+       while (!(inw(base + 0xe) & 0x1) && count++ < 100)
+               if (a)
+                       mdelay(1);
+               else
+                       msleep(1);
+
+       return !(inw(base + 0xe) & 0x1);
+}
+
 static int lock_card(struct isi_board *card)
 {
        char            retries;
@@ -276,69 +290,71 @@ static void unlock_card(struct isi_board *card)
  *  ISI Card specific ops ...
  */
 
+/* card->lock HAS to be held */
 static void raise_dtr(struct isi_port *port)
 {
        struct isi_board *card = port->card;
        unsigned long base = card->base;
        u16 channel = port->channel;
 
-       if (!lock_card(card))
+       if (WaitTillCardIsFree(base))
                return;
 
        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
        outw(0x0504, base);
        InterruptTheCard(base);
        port->status |= ISI_DTR;
-       unlock_card(card);
 }
 
+/* card->lock HAS to be held */
 static inline void drop_dtr(struct isi_port *port)
 {
        struct isi_board *card = port->card;
        unsigned long base = card->base;
        u16 channel = port->channel;
 
-       if (!lock_card(card))
+       if (WaitTillCardIsFree(base))
                return;
 
        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
        outw(0x0404, base);
        InterruptTheCard(base);
        port->status &= ~ISI_DTR;
-       unlock_card(card);
 }
 
+/* card->lock HAS to be held */
 static inline void raise_rts(struct isi_port *port)
 {
        struct isi_board *card = port->card;
        unsigned long base = card->base;
        u16 channel = port->channel;
 
-       if (!lock_card(card))
+       if (WaitTillCardIsFree(base))
                return;
 
        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
        outw(0x0a04, base);
        InterruptTheCard(base);
        port->status |= ISI_RTS;
-       unlock_card(card);
 }
+
+/* card->lock HAS to be held */
 static inline void drop_rts(struct isi_port *port)
 {
        struct isi_board *card = port->card;
        unsigned long base = card->base;
        u16 channel = port->channel;
 
-       if (!lock_card(card))
+       if (WaitTillCardIsFree(base))
                return;
 
        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
        outw(0x0804, base);
        InterruptTheCard(base);
        port->status &= ~ISI_RTS;
-       unlock_card(card);
 }
 
+/* card->lock MUST NOT be held */
 static inline void raise_dtr_rts(struct isi_port *port)
 {
        struct isi_board *card = port->card;
@@ -355,35 +371,20 @@ static inline void raise_dtr_rts(struct isi_port *port)
        unlock_card(card);
 }
 
+/* card->lock HAS to be held */
 static void drop_dtr_rts(struct isi_port *port)
 {
        struct isi_board *card = port->card;
        unsigned long base = card->base;
        u16 channel = port->channel;
 
-       if (!lock_card(card))
+       if (WaitTillCardIsFree(base))
                return;
 
        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
        outw(0x0c04, base);
        InterruptTheCard(base);
        port->status &= ~(ISI_RTS | ISI_DTR);
-       unlock_card(card);
-}
-
-static inline void kill_queue(struct isi_port *port, short queue)
-{
-       struct isi_board *card = port->card;
-       unsigned long base = card->base;
-       u16 channel = port->channel;
-
-       if (!lock_card(card))
-               return;
-
-       outw(0x8000 | (channel << card->shift_count) | 0x02, base);
-       outw((queue << 8) | 0x06, base);
-       InterruptTheCard(base);
-       unlock_card(card);
 }
 
 /*
@@ -744,7 +745,7 @@ static void isicom_config_port(struct isi_port *port)
        else
                raise_dtr(port);
 
-       if (lock_card(card)) {
+       if (WaitTillCardIsFree(base) == 0) {
                outw(0x8000 | (channel << shift_count) |0x03, base);
                outw(linuxb_to_isib[baud] << 8 | 0x03, base);
                channel_setup = 0;
@@ -772,7 +773,6 @@ static void isicom_config_port(struct isi_port *port)
                }
                outw(channel_setup, base);
                InterruptTheCard(base);
-               unlock_card(card);
        }
        if (C_CLOCAL(tty))
                port->flags &= ~ASYNC_CHECK_CD;
@@ -791,12 +791,11 @@ static void isicom_config_port(struct isi_port *port)
        if (I_IXOFF(tty))
                flow_ctrl |= ISICOM_INITIATE_XONXOFF;
 
-       if (lock_card(card)) {
+       if (WaitTillCardIsFree(base) == 0) {
                outw(0x8000 | (channel << shift_count) |0x04, base);
                outw(flow_ctrl << 8 | 0x05, base);
                outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
                InterruptTheCard(base);
-               unlock_card(card);
        }
 
        /*      rx enabled -> enable port for rx on the card    */
@@ -821,10 +820,9 @@ static inline void isicom_setup_board(struct isi_board *bp)
        }
        port = bp->ports;
        bp->status |= BOARD_ACTIVE;
-       spin_unlock_irqrestore(&bp->card_lock, flags);
        for (channel = 0; channel < bp->port_count; channel++, port++)
                drop_dtr_rts(port);
-       return;
+       spin_unlock_irqrestore(&bp->card_lock, flags);
 }
 
 static int isicom_setup_port(struct isi_port *port)
@@ -857,7 +855,12 @@ static int isicom_setup_port(struct isi_port *port)
        port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
 
        /*      discard any residual data       */
-       kill_queue(port, ISICOM_KILLTX | ISICOM_KILLRX);
+       if (WaitTillCardIsFree(card->base) == 0) {
+               outw(0x8000 | (port->channel << card->shift_count) | 0x02,
+                               card->base);
+               outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
+               InterruptTheCard(card->base);
+       }
 
        isicom_config_port(port);
        port->flags |= ASYNC_INITIALIZED;
@@ -983,28 +986,22 @@ static int isicom_open(struct tty_struct *tty, struct file *filp)
 
 static inline void isicom_shutdown_board(struct isi_board *bp)
 {
-       unsigned long flags;
-
-       spin_lock_irqsave(&bp->card_lock, flags);
        if (bp->status & BOARD_ACTIVE) {
                bp->status &= ~BOARD_ACTIVE;
        }
-       spin_unlock_irqrestore(&bp->card_lock, flags);
 }
 
+/* card->lock HAS to be held */
 static void isicom_shutdown_port(struct isi_port *port)
 {
        struct isi_board *card = port->card;
        struct tty_struct *tty;
-       unsigned long flags;
 
        tty = port->tty;
 
-       spin_lock_irqsave(&card->card_lock, flags);
-       if (!(port->flags & ASYNC_INITIALIZED)) {
-               spin_unlock_irqrestore(&card->card_lock, flags);
+       if (!(port->flags & ASYNC_INITIALIZED))
                return;
-       }
+
        if (port->xmit_buf) {
                free_page((unsigned long) port->xmit_buf);
                port->xmit_buf = NULL;
@@ -1012,7 +1009,6 @@ static void isicom_shutdown_port(struct isi_port *port)
        port->flags &= ~ASYNC_INITIALIZED;
        /* 3rd October 2000 : Vinayak P Risbud */
        port->tty = NULL;
-       spin_unlock_irqrestore(&card->card_lock, flags);
 
        /*Fix done by Anil .S on 30-04-2001
        remote login through isi port has dtr toggle problem
@@ -1258,10 +1254,12 @@ static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
        unsigned int set, unsigned int clear)
 {
        struct isi_port *port = tty->driver_data;
+       unsigned long flags;
 
        if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
                return -ENODEV;
 
+       spin_lock_irqsave(&port->card->card_lock, flags);
        if (set & TIOCM_RTS)
                raise_rts(port);
        if (set & TIOCM_DTR)
@@ -1271,6 +1269,7 @@ static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
                drop_rts(port);
        if (clear & TIOCM_DTR)
                drop_dtr(port);
+       spin_unlock_irqrestore(&port->card->card_lock, flags);
 
        return 0;
 }
@@ -1303,7 +1302,10 @@ static int isicom_set_serial_info(struct isi_port *port,
                                (newinfo.flags & ASYNC_FLAGS));
        }
        if (reconfig_port) {
+               unsigned long flags;
+               spin_lock_irqsave(&port->card->card_lock, flags);
                isicom_config_port(port);
+               spin_unlock_irqrestore(&port->card->card_lock, flags);
        }
        return 0;
 }
@@ -1384,6 +1386,7 @@ static void isicom_set_termios(struct tty_struct *tty,
        struct ktermios *old_termios)
 {
        struct isi_port *port = tty->driver_data;
+       unsigned long flags;
 
        if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
                return;
@@ -1392,7 +1395,9 @@ static void isicom_set_termios(struct tty_struct *tty,
                        tty->termios->c_iflag == old_termios->c_iflag)
                return;
 
+       spin_lock_irqsave(&port->card->card_lock, flags);
        isicom_config_port(port);
+       spin_unlock_irqrestore(&port->card->card_lock, flags);
 
        if ((old_termios->c_cflag & CRTSCTS) &&
                        !(tty->termios->c_cflag & CRTSCTS)) {
@@ -1469,11 +1474,15 @@ static void do_isicom_hangup(struct work_struct *work)
 static void isicom_hangup(struct tty_struct *tty)
 {
        struct isi_port *port = tty->driver_data;
+       unsigned long flags;
 
        if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
                return;
 
+       spin_lock_irqsave(&port->card->card_lock, flags);
        isicom_shutdown_port(port);
+       spin_unlock_irqrestore(&port->card->card_lock, flags);
+
        port->count = 0;
        port->flags &= ~ASYNC_NORMAL_ACTIVE;
        port->tty = NULL;
@@ -1578,16 +1587,6 @@ end:
        return retval;
 }
 
-static inline int WaitTillCardIsFree(u16 base)
-{
-       unsigned long count = 0;
-
-       while (!(inw(base + 0xe) & 0x1) && count++ < 100)
-               msleep(5);
-
-       return !(inw(base + 0xe) & 0x1);
-}
-
 static int __devinit load_firmware(struct pci_dev *pdev,
        const unsigned int index, const unsigned int signature)
 {