[PATCH 2.4.32] Fix AVM C4 ISDN card init problems with newer CPUs

["Jukka Partanen" <jspartanen@gmail.com>]

AVM C4 ISDN NIC: Add three memory barriers, taken from 2.6.7,
(they are there in 2.6.17.7 too), to fix module initialization
problems appearing with at least some newer Celerons and
Pentium III.

Signed-off-by: Jukka Partanen <jspartanen@gmail.com>

--- drivers/isdn/avmb1/c4.c.orig	2006-08-03 19:32:17.000000000 +0000
+++ drivers/isdn/avmb1/c4.c	2006-08-03 19:32:55.000000000 +0000
@@ -151,6 +151,7 @@
	while (c4inmeml(card->mbase+DOORBELL) != 0xffffffff) {
		if (!time_before(jiffies, stop))
			return -1;
+		mb();
	}
	return 0;
}
@@ -305,6 +306,7 @@
		if (!time_before(jiffies, stop))
			return;
		c4outmeml(card->mbase+DOORBELL, DBELL_ADDR);
+		mb();
	}

	c4_poke(card, DC21285_ARMCSR_BASE + CHAN_1_CONTROL, 0);
@@ -328,6 +330,7 @@
		if (!time_before(jiffies, stop))
			return 2;
		c4outmeml(card->mbase+DOORBELL, DBELL_ADDR);
+		mb();
	}

	c4_poke(card, DC21285_ARMCSR_BASE + CHAN_1_CONTROL, 0);
-
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