1 files changed, 58 insertions, 71 deletions
diff --git a/drivers/serial/sn_console.c b/drivers/serial/sn_console.c
index 5468e5a767e2..43e67d6c29d4 100644
--- a/drivers/serial/sn_console.c
+++ b/drivers/serial/sn_console.c
@@ -6,7 +6,7 @@
 * driver for that.
 *
 *
- * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2004-2006 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
@@ -829,8 +829,8 @@ static int __init sn_sal_module_init(void)
                misc.name = DEVICE_NAME_DYNAMIC;
                retval = misc_register(&misc);
                if (retval != 0) {
-                        printk
+                        printk(KERN_WARNING "Failed to register console "
-                            ("Failed to register console device using misc_register.\n");
+                               "device using misc_register.\n");
                        return -ENODEV;
                }
                sal_console_uart.major = MISC_MAJOR;
@@ -942,88 +942,75 @@ sn_sal_console_write(struct console *co, const char *s, unsigned count)
 {
        unsigned long flags = 0;
        struct sn_cons_port *port = &sal_console_port;
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
        static int stole_lock = 0;
-#endif
        BUG_ON(!port->sc_is_asynch);
        /* We can't look at the xmit buffer if we're not registered with serial core
         *  yet.  So only do the fancy recovery after registering
         */
-        if (port->sc_port.info) {
+        if (!port->sc_port.info) {
+                /* Not yet registered with serial core - simple case */
-                /* somebody really wants this output, might be an
+                puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
-                 * oops, kdb, panic, etc.  make sure they get it. */
+                return;
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
+        }
-                if (spin_is_locked(&port->sc_port.lock)) {
-                        int lhead = port->sc_port.info->xmit.head;
-                        int ltail = port->sc_port.info->xmit.tail;
-                        int counter, got_lock = 0;
-                        /*
+        /* somebody really wants this output, might be an
-                         * We attempt to determine if someone has died with the
+         * oops, kdb, panic, etc.  make sure they get it. */
-                         * lock. We wait ~20 secs after the head and tail ptrs
+        if (spin_is_locked(&port->sc_port.lock)) {
-                         * stop moving and assume the lock holder is not functional
+                int lhead = port->sc_port.info->xmit.head;
-                         * and plow ahead. If the lock is freed within the time out
+                int ltail = port->sc_port.info->xmit.tail;
-                         * period we re-get the lock and go ahead normally. We also
+                int counter, got_lock = 0;
-                         * remember if we have plowed ahead so that we don't have
-                         * to wait out the time out period again - the asumption
+                /*
-                         * is that we will time out again.
+                 * We attempt to determine if someone has died with the
-                         */
+                 * lock. We wait ~20 secs after the head and tail ptrs
+                 * stop moving and assume the lock holder is not functional
+                 * and plow ahead. If the lock is freed within the time out
+                 * period we re-get the lock and go ahead normally. We also
+                 * remember if we have plowed ahead so that we don't have
+                 * to wait out the time out period again - the asumption
+                 * is that we will time out again.
+                 */
-                        for (counter = 0; counter < 150; mdelay(125), counter++) {
+                for (counter = 0; counter < 150; mdelay(125), counter++) {
-                                if (!spin_is_locked(&port->sc_port.lock)
+                        if (!spin_is_locked(&port->sc_port.lock)
-                                    || stole_lock) {
+                            || stole_lock) {
-                                        if (!stole_lock) {
+                                if (!stole_lock) {
-                                                spin_lock_irqsave(&port->
+                                        spin_lock_irqsave(&port->sc_port.lock,
-                                                                  sc_port.lock,
+                                                          flags);
-                                                                  flags);
+                                        got_lock = 1;
-                                                got_lock = 1;
-                                        }
-                                        break;
-                                } else {
-                                        /* still locked */
-                                        if ((lhead !=
-                                             port->sc_port.info->xmit.head)
-                                            || (ltail !=
-                                                port->sc_port.info->xmit.
-                                                tail)) {
-                                                lhead =
-                                                    port->sc_port.info->xmit.
-                                                    head;
-                                                ltail =
-                                                    port->sc_port.info->xmit.
-                                                    tail;
-                                                counter = 0;
-                                        }
                                }
-                        }
+                                break;
-                        /* flush anything in the serial core xmit buffer, raw */
-                        sn_transmit_chars(port, 1);
-                        if (got_lock) {
-                                spin_unlock_irqrestore(&port->sc_port.lock,
-                                                       flags);
-                                stole_lock = 0;
                        } else {
-                                /* fell thru */
+                                /* still locked */
-                                stole_lock = 1;
+                                if ((lhead != port->sc_port.info->xmit.head)
+                                    || (ltail !=
+                                        port->sc_port.info->xmit.tail)) {
+                                        lhead =
+                                                port->sc_port.info->xmit.head;
+                                        ltail =
+                                                port->sc_port.info->xmit.tail;
+                                        counter = 0;
+                                }
                        }
-                        puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
+                }
-                } else {
+                /* flush anything in the serial core xmit buffer, raw */
-                        stole_lock = 0;
+                sn_transmit_chars(port, 1);
-#endif
+                if (got_lock) {
-                        spin_lock_irqsave(&port->sc_port.lock, flags);
-                        sn_transmit_chars(port, 1);
                        spin_unlock_irqrestore(&port->sc_port.lock, flags);
+                        stole_lock = 0;
-                        puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
+                } else {
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
+                        /* fell thru */
+                        stole_lock = 1;
                }
-#endif
+                puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
-        }
+        } else {
-        else {
+                stole_lock = 0;
-                /* Not yet registered with serial core - simple case */
+                spin_lock_irqsave(&port->sc_port.lock, flags);
+                sn_transmit_chars(port, 1);
+                spin_unlock_irqrestore(&port->sc_port.lock, flags);
                puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
        }
 }

diff --git a/drivers/serial/sn_console.c b/drivers/serial/sn_console.c index 5468e5a767e2..43e67d6c29d4 100644 --- a/drivers/serial/sn_console.c +++ b/drivers/serial/sn_console.c
@@ -6,7 +6,7 @@
6	* driver for that.	6	* driver for that.
7	*	7	*
8	*	8	*
9	* Copyright (c) 2004-2005 Silicon Graphics, Inc. All Rights Reserved.	9	* Copyright (c) 2004-2006 Silicon Graphics, Inc. All Rights Reserved.
10	*	10	*
11	* This program is free software; you can redistribute it and/or modify it	11	* This program is free software; you can redistribute it and/or modify it
12	* under the terms of version 2 of the GNU General Public License	12	* under the terms of version 2 of the GNU General Public License
@@ -829,8 +829,8 @@ static int __init sn_sal_module_init(void)
829	misc.name = DEVICE_NAME_DYNAMIC;	829	misc.name = DEVICE_NAME_DYNAMIC;
830	retval = misc_register(&misc);	830	retval = misc_register(&misc);
831	if (retval != 0) {	831	if (retval != 0) {
832	printk	832	printk(KERN_WARNING "Failed to register console "
833	("Failed to register console device using misc_register.\n");	833	"device using misc_register.\n");
834	return -ENODEV;	834	return -ENODEV;
835	}	835	}
836	sal_console_uart.major = MISC_MAJOR;	836	sal_console_uart.major = MISC_MAJOR;
@@ -942,88 +942,75 @@ sn_sal_console_write(struct console co, const char s, unsigned count)
942	{	942	{
943	unsigned long flags = 0;	943	unsigned long flags = 0;
944	struct sn_cons_port *port = &sal_console_port;	944	struct sn_cons_port *port = &sal_console_port;
945	#if defined(CONFIG_SMP) \|\| defined(CONFIG_PREEMPT)
946	static int stole_lock = 0;	945	static int stole_lock = 0;
947	#endif
948		946
949	BUG_ON(!port->sc_is_asynch);	947	BUG_ON(!port->sc_is_asynch);
950		948
951	/* We can't look at the xmit buffer if we're not registered with serial core	949	/* We can't look at the xmit buffer if we're not registered with serial core
952	* yet. So only do the fancy recovery after registering	950	* yet. So only do the fancy recovery after registering
953	*/	951	*/
954	if (port->sc_port.info) {	952	if (!port->sc_port.info) {
955		953	/* Not yet registered with serial core - simple case */
956	/* somebody really wants this output, might be an	954	puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
957	* oops, kdb, panic, etc. make sure they get it. */	955	return;
958	#if defined(CONFIG_SMP) \|\| defined(CONFIG_PREEMPT)	956	}
959	if (spin_is_locked(&port->sc_port.lock)) {
960	int lhead = port->sc_port.info->xmit.head;
961	int ltail = port->sc_port.info->xmit.tail;
962	int counter, got_lock = 0;
963		957
964	/*	958	/* somebody really wants this output, might be an
965	* We attempt to determine if someone has died with the	959	* oops, kdb, panic, etc. make sure they get it. */
966	* lock. We wait ~20 secs after the head and tail ptrs	960	if (spin_is_locked(&port->sc_port.lock)) {
967	* stop moving and assume the lock holder is not functional	961	int lhead = port->sc_port.info->xmit.head;
968	* and plow ahead. If the lock is freed within the time out	962	int ltail = port->sc_port.info->xmit.tail;
969	* period we re-get the lock and go ahead normally. We also	963	int counter, got_lock = 0;
970	* remember if we have plowed ahead so that we don't have	964
971	* to wait out the time out period again - the asumption	965	/*
972	* is that we will time out again.	966	* We attempt to determine if someone has died with the
973	*/	967	* lock. We wait ~20 secs after the head and tail ptrs
		968	* stop moving and assume the lock holder is not functional
		969	* and plow ahead. If the lock is freed within the time out
		970	* period we re-get the lock and go ahead normally. We also
		971	* remember if we have plowed ahead so that we don't have
		972	* to wait out the time out period again - the asumption
		973	* is that we will time out again.
		974	*/
974		975
975	for (counter = 0; counter < 150; mdelay(125), counter++) {	976	for (counter = 0; counter < 150; mdelay(125), counter++) {
976	if (!spin_is_locked(&port->sc_port.lock)	977	if (!spin_is_locked(&port->sc_port.lock)
977	\|\| stole_lock) {	978	\|\| stole_lock) {
978	if (!stole_lock) {	979	if (!stole_lock) {
979	spin_lock_irqsave(&port->	980	spin_lock_irqsave(&port->sc_port.lock,
980	sc_port.lock,	981	flags);
981	flags);	982	got_lock = 1;
982	got_lock = 1;
983	}
984	break;
985	} else {
986	/* still locked */
987	if ((lhead !=
988	port->sc_port.info->xmit.head)
989	\|\| (ltail !=
990	port->sc_port.info->xmit.
991	tail)) {
992	lhead =
993	port->sc_port.info->xmit.
994	head;
995	ltail =
996	port->sc_port.info->xmit.
997	tail;
998	counter = 0;
999	}
1000	}	983	}
1001	}	984	break;
1002	/* flush anything in the serial core xmit buffer, raw */
1003	sn_transmit_chars(port, 1);
1004	if (got_lock) {
1005	spin_unlock_irqrestore(&port->sc_port.lock,
1006	flags);
1007	stole_lock = 0;
1008	} else {	985	} else {
1009	/* fell thru */	986	/* still locked */
1010	stole_lock = 1;	987	if ((lhead != port->sc_port.info->xmit.head)
		988	\|\| (ltail !=
		989	port->sc_port.info->xmit.tail)) {
		990	lhead =
		991	port->sc_port.info->xmit.head;
		992	ltail =
		993	port->sc_port.info->xmit.tail;
		994	counter = 0;
		995	}
1011	}	996	}
1012	puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);	997	}
1013	} else {	998	/* flush anything in the serial core xmit buffer, raw */
1014	stole_lock = 0;	999	sn_transmit_chars(port, 1);
1015	#endif	1000	if (got_lock) {
1016	spin_lock_irqsave(&port->sc_port.lock, flags);
1017	sn_transmit_chars(port, 1);
1018	spin_unlock_irqrestore(&port->sc_port.lock, flags);	1001	spin_unlock_irqrestore(&port->sc_port.lock, flags);
1019		1002	stole_lock = 0;
1020	puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);	1003	} else {
1021	#if defined(CONFIG_SMP) \|\| defined(CONFIG_PREEMPT)	1004	/* fell thru */
		1005	stole_lock = 1;
1022	}	1006	}
1023	#endif	1007	puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
1024	}	1008	} else {
1025	else {	1009	stole_lock = 0;
1026	/* Not yet registered with serial core - simple case */	1010	spin_lock_irqsave(&port->sc_port.lock, flags);
		1011	sn_transmit_chars(port, 1);
		1012	spin_unlock_irqrestore(&port->sc_port.lock, flags);
		1013
1027	puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);	1014	puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
1028	}	1015	}
1029	}	1016	}