From f7b0d2df2f6fd9abdf47b4a1965dcaa2870e35df Mon Sep 17 00:00:00 2001
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Date: Mon, 20 Aug 2007 22:42:56 +0200
Subject: cs5530: add missing ->dma_base check

If ->dma_base is not set (== PCI BAR4 cannot be reserved) then DMA hooks
shouldn't be initialized or bad things will happen.

Also this host driver requires valid PCI BAR4 for normal operation so
check it in ->init_chipset and fail initialization if not set.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
 drivers/ide/pci/cs5530.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'drivers/ide')

diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index acaf71fd4c09..e5949b1d3fb0 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/cs5530.c		Version 0.73	Mar 10 2007
+ * linux/drivers/ide/pci/cs5530.c		Version 0.74	Jul 28 2007
  *
  * Copyright (C) 2000			Andre Hedrick <andre@linux-ide.org>
  * Copyright (C) 2000			Mark Lord <mlord@pobox.com>
@@ -207,6 +207,9 @@ static unsigned int __devinit init_chipset_cs5530 (struct pci_dev *dev, const ch
 	struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
 	unsigned long flags;
 
+	if (pci_resource_start(dev, 4) == 0)
+		return -EFAULT;
+
 	dev = NULL;
 	while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
 		switch (dev->device) {
@@ -325,6 +328,9 @@ static void __devinit init_hwif_cs5530 (ide_hwif_t *hwif)
 			/* needs autotuning later */
 	}
 
+	if (hwif->dma_base == 0)
+		return;
+
 	hwif->atapi_dma = 1;
 	hwif->ultra_mask = 0x07;
 	hwif->mwdma_mask = 0x07;
-- 
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