If EP attempts to send an IRQ (legacy, MSI or MSI-X) while the
link is not up, return -EINVAL
Signed-off-by: Alan Douglas <adouglas@xxxxxxxxxxx>
---
drivers/pci/controller/pcie-cadence-ep.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/controller/pcie-cadence-ep.c b/drivers/pci/controller/pcie-cadence-ep.c
index db75280..33e30dd 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,
u16 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:
--
1.7.1
