[PATCH v2 12/12] pci: ls_pcie_g4: Add size check for config resource

[Wasim Khan <wasim.khan@nxp.com>]

resource "config" is required to have minimum 4KB space
to access all config space of PCI Express EP.

Signed-off-by: Wasim Khan <wasim.khan@nxp.com>
---
Changes in V2:
- Updated commit description
- Fix CheckPatch issue
- Change size check to 4KB to access PCIe config space

Changes in V3:
- No Change

 drivers/pci/pcie_layerscape_gen4.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/pcie_layerscape_gen4.c b/drivers/pci/pcie_layerscape_gen4.c
index 0226bde..6e71173 100644
--- a/drivers/pci/pcie_layerscape_gen4.c
+++ b/drivers/pci/pcie_layerscape_gen4.c
@@ -455,6 +455,7 @@ static int ls_pcie_g4_probe(struct udevice *dev)
 	u32 link_ctrl_sta;
 	u32 val;
 	int ret;
+	fdt_size_t cfg_size;
 
 	pcie->bus = dev;
 
@@ -488,6 +489,13 @@ static int ls_pcie_g4_probe(struct udevice *dev)
 		return ret;
 	}
 
+	cfg_size = fdt_resource_size(&pcie->cfg_res);
+	if (cfg_size < SZ_4K) {
+		printf("PCIe%d: %s Invalid size(0x%llx) for resource \"config\",expected minimum 0x%x\n",
+		       PCIE_SRDS_PRTCL(pcie->idx), dev->name, cfg_size, SZ_4K);
+		return 0;
+	}
+
 	pcie->cfg = map_physmem(pcie->cfg_res.start,
 				fdt_resource_size(&pcie->cfg_res),
 				MAP_NOCACHE);
-- 
2.7.4