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| author | Olof Johansson <olof@lixom.net> | 2005-06-13 15:52:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-13 20:58:58 -0700 |
| commit | f797f9cc5485b50c35c106b462e1bc432ec37f90 (patch) | |
| tree | 283443fcdeb709c768ed5cd481203459b5222441 /drivers/pci | |
| parent | a3c77c67a443e631febf708bb0c376caede31657 (diff) | |
| download | linux-f797f9cc5485b50c35c106b462e1bc432ec37f90.tar.gz linux-f797f9cc5485b50c35c106b462e1bc432ec37f90.tar.bz2 linux-f797f9cc5485b50c35c106b462e1bc432ec37f90.zip | |
[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/pci')
| -rw-r--r-- | drivers/pci/probe.c | 2 |
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) /* * Find the extent of a PCI decode.. */ -static u32 pci_size(u32 base, u32 maxbase, unsigned long mask) +static u32 pci_size(u32 base, u32 maxbase, u32 mask) { u32 size = mask & maxbase; /* Find the significant bits */ if (!size) |