Commit 6d3a1741f1e648cfbd5a0cc94477a0d5004c6f5e upstream. This is part
of the fix for https://bugzilla.kernel.org/show_bug.cgi?id=65211
Previously we allowed callers to access Slot Capabilities, Status, and
Control for Root Ports even if the Root Port did not implement a slot.
This seems dubious because the spec only requires these registers if a
slot is implemented.
It's true that even Root Ports without slots must have *space* for these
slot registers, because the Root Capabilities, Status, and Control
registers are after the slot registers in the capability. However,
for a v1 PCIe Capability, the *semantics* of the slot registers are
undefined unless a slot is implemented.
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
Reviewed-By: Jiang Liu <jiang....@huawei.com>
CC: sta...@vger.kernel.org # v3.7+
---
drivers/pci/access.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 9a46fa9135d9..061da8c3ab4b 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -497,9 +497,9 @@ static inline bool pcie_cap_has_sltctl(const struct pci_dev
*dev)
{
int type = pci_pcie_type(dev);
- return type == PCI_EXP_TYPE_ROOT_PORT ||
- (type == PCI_EXP_TYPE_DOWNSTREAM &&
- pcie_caps_reg(dev) & PCI_EXP_FLAGS_SLOT);
+ return (type == PCI_EXP_TYPE_ROOT_PORT ||
+ type == PCI_EXP_TYPE_DOWNSTREAM) &&
+ pcie_caps_reg(dev) & PCI_EXP_FLAGS_SLOT;
}
static inline bool pcie_cap_has_rtctl(const struct pci_dev *dev)
--
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