Problem initializing PCI boards where IRQ has to be guessed

[Marty Leisner]

I had this problem in 2.4.27...the same code is in 2.6.8.1

If the bios doesn't assign an interrupt, the guessing algorithm is 
able to work only in a very special case (when the mask is one bit).

In 2.4.27 (I have lxr.linux.no for 2.4.26, its the same in
2.6.8.1)

933         if (!irq) {
934                 DBG(" ... failed\n");
935                 if (newirq && mask == (1 << newirq)) {
936                         msg = "Guessed";
937                         irq = newirq;
938                 } else
939                         return 0;

In 2.4.27 I have:
@@ -942,7 +939,8 @@
 
        if (!irq) {
                DBG(" ... failed\n");
- -               if (newirq && mask == (1 << newirq)) {
+               if (newirq && (mask & (1 << newirq))) {
+                       /* newirq is a routable interrupt */
                        msg = "Guessed";
                        irq = newirq;
                } else



marty    mleisner@xxxxxxxxxxxxxxxx
Don't  confuse education with schooling.
	Milton Friedman to Yogi Berra


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/