linux-kernel - [PATCH] Prevent IDE boot ops on NUMA system in mainline

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Date:	Mon, 11 Feb 2008 01:35:20 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	torvalds@...l.org, bzolnier@...il.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Prevent IDE boot ops on NUMA system in mainline


Without this patch a Opteron test system here oopses at boot with currentg git. 

Calling to_pci_dev() on a NULL pointer gives a negative value so the following NULL 
pointer check never triggers and then an illegal address is referenced. Check the 
unadjusted original device pointer for NULL instead.

Signed-off-by: Andi Kleen <ak@...e.de>

Index: linux/include/linux/ide.h
===================================================================
--- linux.orig/include/linux/ide.h
+++ linux/include/linux/ide.h
@@ -1294,7 +1294,7 @@ static inline void ide_dump_identify(u8 
 static inline int hwif_to_node(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
-	return dev ? pcibus_to_node(dev->bus) : -1;
+	return hwif->dev ? pcibus_to_node(dev->bus) : -1;
 }
 
 static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)
--
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