On Mon, Jul 9, 2012 at 12:20 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: > Since 2.6.36 (253d2e5498), we've disabled MEM & IO decoding while we size > BARs (except for host bridge devices). These patches tweak this in two > ways: > > 1) We only kept decoding disabled while sizing the low-order dword > of 64-bit BARs. I think we should keep it disabled while we do the > high-order dword also. > > 2) I think we should also disable decoding while updating 64-bit BARs, > e.g., when we move a device into an aperture of an upstream bridge. I'm > only proposing to disable decoding for 64-bit BAR updates because 32-bit > ones can be done atomically, while 64-bit updates require two writes and > the half-written state is a potential problem. > > I'm considering these changes for the 3.6 merge window, which is > approaching fast, so let me know if you see issues with either of these. > > --- > > Bjorn Helgaas (2): > PCI: leave MEM and IO decoding disabled during 64-bit BAR sizing, too > PCI: disable MEM decoding while updating 64-bit MEM BARs > > > drivers/pci/probe.c | 6 +++--- > drivers/pci/setup-res.c | 18 ++++++++++++++++++ > 2 files changed, 21 insertions(+), 3 deletions(-) I applied these to my "next" branch. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
