[PATCH v4 04/12] PCI: rockchip-ep: Improve rockchip_pcie_ep_map_addr()

[Damien Le Moal]

Add a check to verify that the outbound region to be used for mapping an
address is not already in use.

Signed-off-by: Damien Le Moal <dlemoal at kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org>
---
 drivers/pci/controller/pcie-rockchip-ep.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 89ebdf3e4737..edb84fb1ba39 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -243,6 +243,9 @@ static int rockchip_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, u8 vfn,
 	struct rockchip_pcie *pcie = &ep->rockchip;
 	u32 r = rockchip_ob_region(addr);
 
+	if (test_bit(r, &ep->ob_region_map))
+		return -EBUSY;
+
 	rockchip_pcie_prog_ep_ob_atu(pcie, fn, r, addr, pci_addr, size);
 
 	set_bit(r, &ep->ob_region_map);
-- 
2.47.0