summaryrefslogtreecommitdiffstats
path: root/drivers/pci/probe.c
diff options
context:
space:
mode:
authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2008-03-30 19:50:14 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-20 21:47:08 -0700
commit884525655d07fdee9245716b998ecdc45cdd8007 (patch)
tree975cbf2b5079430240d3496323df1a266be95d27 /drivers/pci/probe.c
parentd75b305295c38ba9610ff3b2200f7d1989dc55fd (diff)
downloadlinux-884525655d07fdee9245716b998ecdc45cdd8007.tar.gz
linux-884525655d07fdee9245716b998ecdc45cdd8007.tar.bz2
linux-884525655d07fdee9245716b998ecdc45cdd8007.zip
PCI: clean up resource alignment management
Done per Linus' request and suggestions. Linus has explained that better than I'll be able to explain: On Thu, Mar 27, 2008 at 10:12:10AM -0700, Linus Torvalds wrote: > Actually, before we go any further, there might be a less intrusive > alternative: add just a couple of flags to the resource flags field (we > still have something like 8 unused bits on 32-bit), and use those to > implement a generic "resource_alignment()" routine. > > Two flags would do it: > > - IORESOURCE_SIZEALIGN: size indicates alignment (regular PCI device > resources) > > - IORESOURCE_STARTALIGN: start field is alignment (PCI bus resources > during probing) > > and then the case of both flags zero (or both bits set) would actually be > "invalid", and we would also clear the IORESOURCE_STARTALIGN flag when we > actually allocate the resource (so that we don't use the "start" field as > alignment incorrectly when it no longer indicates alignment). > > That wouldn't be totally generic, but it would have the nice property of > automatically at least add sanity checking for that whole "res->start has > the odd meaning of 'alignment' during probing" and remove the need for a > new field, and it would allow us to have a generic "resource_alignment()" > routine that just gets a resource pointer. Besides, I removed IORESOURCE_BUS_HAS_VGA flag which was unused for ages. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Gary Hade <garyhade@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index c2e99fd87faf..33d9b8bea6e0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -235,7 +235,7 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
}
res->end = res->start + (unsigned long) sz;
- res->flags |= pci_calc_resource_flags(l);
+ res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
if (is_64bit_memory(l)) {
u32 szhi, lhi;
@@ -288,7 +288,8 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
if (sz) {
res->flags = (l & IORESOURCE_ROM_ENABLE) |
IORESOURCE_MEM | IORESOURCE_PREFETCH |
- IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
+ IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
+ IORESOURCE_SIZEALIGN;
res->start = l & PCI_ROM_ADDRESS_MASK;
res->end = res->start + (unsigned long) sz;
}