[PATCH v7 1/3] PCI: AtomicOps: Do not enable requests by RCiEPs

[Gerd Bayer]

Since root complex integrated end points (RCiEPs) attach to a bus that
has no bridge device describing the root port, the capability to
complete AtomicOps requests cannot be determined with PCIe methods.

Change default of pci_enable_atomic_ops_to_root() to not enable
AtomicOps requests on RCiEPs.

Signed-off-by: Gerd Bayer <gbayer@xxxxxxxxxxxxx>
---
 drivers/pci/pci.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8479c2e1f74f1044416281aba11bf071ea89488a..135e5b591df405e87e7f520a618d7e2ccba55ce1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3692,15 +3692,14 @@ int pci_enable_atomic_ops_to_root(struct pci_dev *dev, u32 cap_mask)
 
 	/*
 	 * Per PCIe r4.0, sec 6.15, endpoints and root ports may be
-	 * AtomicOp requesters.  For now, we only support endpoints as
-	 * requesters and root ports as completers.  No endpoints as
+	 * AtomicOp requesters.  For now, we only support (legacy) endpoints
+	 * as requesters and root ports as completers.  No endpoints as
 	 * completers, and no peer-to-peer.
 	 */
 
 	switch (pci_pcie_type(dev)) {
 	case PCI_EXP_TYPE_ENDPOINT:
 	case PCI_EXP_TYPE_LEG_END:
-	case PCI_EXP_TYPE_RC_END:
 		break;
 	default:
 		return -EINVAL;

-- 
2.51.0