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authorOlof Johansson <olof@lixom.net>2005-06-13 18:52:27 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-13 23:58:58 -0400
commitf797f9cc5485b50c35c106b462e1bc432ec37f90 (patch)
tree283443fcdeb709c768ed5cd481203459b5222441 /drivers
parenta3c77c67a443e631febf708bb0c376caede31657 (diff)
[PATCH] Fix PCI BAR size interpretation on 64-bit arches
On 64-bit machines, PCI_BASE_ADDRESS_MEM_MASK and other mask constants passed to pci_size() are 64-bit (for example ~0x0fUL). However, pci_size does comparisons between the u32 arguments and the mask, which will fail even though any result from pci_size is still just 32-bit. Changing the mask argument to u32 seems the obvious thing to do, since all arithmetic in the function is 32-bit and having a larger mask makes no sense. This triggered on a PPC64 system here where an adapter (VGA, as it happened) had a memory region base of 0xfe000000 and a sz of the same, matching the if (max == maxbase ...) test at the bottom of pci_size but failing the mask comparison. Quite a corner case which I guess explains why we haven't seen it until now. Signed-off-by: Olof Johansson <olof@lixom.net> Acked-by: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/probe.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b7ae87823c69..fd48b201eb53 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -125,7 +125,7 @@ static inline unsigned int pci_calc_resource_flags(unsigned int flags)
125/* 125/*
126 * Find the extent of a PCI decode.. 126 * Find the extent of a PCI decode..
127 */ 127 */
128static u32 pci_size(u32 base, u32 maxbase, unsigned long mask) 128static u32 pci_size(u32 base, u32 maxbase, u32 mask)
129{ 129{
130 u32 size = mask & maxbase; /* Find the significant bits */ 130 u32 size = mask & maxbase; /* Find the significant bits */
131 if (!size) 131 if (!size)