From: Wasim Khan <wasim.khan@nxp.com>
Date: Mon, 28 Sep 2020 10:56:14 +0000 (+0530)
Subject: pci: ls_pcie_g4: Add size check for config resource
X-Git-Tag: v2021.10~408^2~21
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1255f8bc36101400fd16fc4898f9dd9fdccbbc2e;p=platform%2Fkernel%2Fu-boot.git

pci: ls_pcie_g4: Add size check for config resource

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>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
---

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);