From: Bjorn Helgaas Date: Tue, 27 Aug 2013 15:54:40 +0000 (-0600) Subject: PCI: Allow PCIe Capability link-related register access for switches X-Git-Tag: v3.10.21~64 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b72a3a06c698143d5b315a2882c3ecb4c947ac5f;p=platform%2Fkernel%2Flinux-stable.git PCI: Allow PCIe Capability link-related register access for switches commit d3694d4fa3f44f6a295f8ab064937c8a1549d174 upstream. Every PCIe device has a link, except Root Complex Integrated Endpoints and Root Complex Event Collectors. Previously we didn't give access to PCIe capability link-related registers for Upstream Ports, Downstream Ports, and Bridges, so attempts to read PCI_EXP_LNKCTL incorrectly returned zero. See PCIe spec r3.0, sec 7.8 and 1.3.2.3. Reference: http://lkml.kernel.org/r/979A8436335E3744ADCD3A9F2A2B68A52AD136BE@SJEXCHMB10.corp.ad.broadcom.com Reported-by: Yuval Mintz Signed-off-by: Bjorn Helgaas Reviewed-By: Jiang Liu Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/pci/access.c b/drivers/pci/access.c index 1cc2366..e26c3bd 100644 --- a/drivers/pci/access.c +++ b/drivers/pci/access.c @@ -485,9 +485,13 @@ static inline bool pcie_cap_has_lnkctl(const struct pci_dev *dev) int type = pci_pcie_type(dev); return pcie_cap_version(dev) > 1 || - type == PCI_EXP_TYPE_ROOT_PORT || type == PCI_EXP_TYPE_ENDPOINT || - type == PCI_EXP_TYPE_LEG_END; + type == PCI_EXP_TYPE_LEG_END || + type == PCI_EXP_TYPE_ROOT_PORT || + type == PCI_EXP_TYPE_UPSTREAM || + type == PCI_EXP_TYPE_DOWNSTREAM || + type == PCI_EXP_TYPE_PCI_BRIDGE || + type == PCI_EXP_TYPE_PCIE_BRIDGE; } static inline bool pcie_cap_has_sltctl(const struct pci_dev *dev)