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[11/19] PCI: rockchip-ep: Improve rockchip_pcie_ep_map_addr()

Message ID 20240329090945.1097609-12-dlemoal@kernel.org (mailing list archive)
State New, archived
Headers show
Series Improve PCI memory mapping API | expand

Commit Message

Damien Le Moal March 29, 2024, 9:09 a.m. UTC 
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@kernel.org>
---
 drivers/pci/controller/pcie-rockchip-ep.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 296916d4a6e4..c2ca7878cee3 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -245,6 +245,9 @@  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);