If EP attempts to send an IRQ (legacy, MSI or MSI-X) while the
link is not up, return -EINVAL
Fixes: 37dddf14f1ae ("PCI: cadence: Add EndPoint Controller driver for Cadence PCIe controller")
Signed-off-by: Alan Douglas <adouglas@xxxxxxxxxxx>
---
drivers/pci/controller/pcie-cadence-ep.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/pci/controller/pcie-cadence-ep.c b/drivers/pci/controller/pcie-cadence-ep.c
index 56f6b87..1248d75 100644
--- a/drivers/pci/controller/pcie-cadence-ep.c
+++ b/drivers/pci/controller/pcie-cadence-ep.c
@@ -370,6 +370,12 @@ static int cdns_pcie_ep_raise_irq(struct pci_epc *epc, u8 fn,
enum pci_epc_irq_type type, u8 interrupt_num)
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ u32 link_status;
+
+ /* Can't send an IRQ if the link is down. */
+ link_status = cdns_pcie_readl(&ep->pcie, CDNS_PCIE_LM_BASE);
+ if (!(link_status & 0x1))
+ return -EINVAL;
switch (type) {
case PCI_EPC_IRQ_LEGACY:
--
1.9.0
