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

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Message-ID: <d50597c30608030953l41e8661dg1c10faeac31cc87f@mail.gmail.com>
Date:	Thu, 3 Aug 2006 19:53:33 +0300
From:	"Jukka Partanen" <jspartanen@...il.com>
To:	kkeil@...e.de
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 2.4.32] Fix AVM C4 ISDN card init problems with newer CPUs

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@...il.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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