From 636853ae729d934b047b1761c308cdc024e2c46e Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 17 Oct 1995 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1995-10-17

---
 pc/devi82365.c | 53 ++++++++++++++++++++++++++++++++++----------------
 port/qlock.c   |  2 +-
 2 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/pc/devi82365.c b/pc/devi82365.c
index 6fc7f9230d3ba15d86c4b3f283cceb433d73b354..57cf3ae82470f145a0a3e62bd90fbb015aa64051 100644
--- a/pc/devi82365.c
+++ b/pc/devi82365.c
@@ -538,12 +538,12 @@ i82386probe(int x, int d, int dev)
 		outb(x, Rchipinfo + (dev<<7));
 		outb(d, 0);
 		c = inb(d);
-		if((c & 0xdf) == 0xdc){
-			c = inb(d);
-			if((c & 0xdf) != 0x0c)
-				break;
-		}
-		if(c & 0x40){
+		if((c & 0xc0) != 0xc0)
+			break;
+		c = inb(d);
+		if((c & 0xc0) != 0x00)
+			break;
+		if(c & 0x20){
 			cp->type = Tpd6720;
 		} else {
 			cp->type = Tpd6710;
@@ -907,7 +907,7 @@ pcmio(int slotno, ISAConf *isa)
 {
 	uchar we, x, *p;
 	Slot *pp;
-	Conftab *ct;
+	Conftab *ct, *et, *t;
 	PCMmap *m;
 	int irq;
 
@@ -922,19 +922,38 @@ pcmio(int slotno, ISAConf *isa)
 	if(!pp->occupied)
 		return -1;
 
-	/* find a configuration with the right port */
-	for(ct = pp->ctab; ct < &pp->ctab[pp->nctab]; ct++){
-		if(ct->nioregs && ct->port == isa->port && ((1<<irq) & ct->irqs))
-			break;
-	}
+	et = &pp->ctab[pp->nctab];
 
-	/* if non found, settle for one with the some ioregs */
-	if(ct == &pp->ctab[pp->nctab])
-		for(ct = pp->ctab; ct < &pp->ctab[pp->nctab]; ct++)
-			if(ct->nioregs && ((1<<irq) & ct->irqs))
+	/* assume default is right */
+	if(pp->def)
+		ct = pp->def;
+	else
+		ct = pp->ctab;
+
+	/* try for best match */
+	if(ct->nioregs == 0 || ct->port != isa->port || ((1<<irq) & ct->irqs) == 0){
+		for(t = pp->ctab; t < et; t++)
+			if(t->nioregs && t->port == isa->port && ((1<<irq) & t->irqs)){
+				ct = t;
 				break;
+			}
+	}
+	if(ct->nioregs == 0 || ((1<<irq) & ct->irqs) == 0){
+		for(t = pp->ctab; t < et; t++)
+			if(t->nioregs && ((1<<irq) & t->irqs)){
+				ct = t;
+				break;
+			}
+	}
+	if(ct->nioregs == 0){
+		for(t = pp->ctab; t < et; t++)
+			if(t->nioregs){
+				ct = t;
+				break;
+			}
+	}
 
-	if(ct == &pp->ctab[pp->nctab])
+	if(ct == et || ct->nioregs == 0)
 		return -1;
 
 	/* route interrupts */
diff --git a/port/qlock.c b/port/qlock.c
index 7b7fbab557decc94227e4225425f5b2d6e409af0..bb1e1aaeca933b2f38c7467cc083e0d394695ba6 100644
--- a/port/qlock.c
+++ b/port/qlock.c
@@ -92,6 +92,6 @@ wlock(RWlock *l)
 void
 wunlock(RWlock *l)
 {
-	qunlock(&l->x);
 	qunlock(&l->k);
+	qunlock(&l->x);
 }