linux-kernel - [PATCH 09/22] PCI: aardvark: Use SET_PCI_ERROR

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Message-Id: <f423dc9cc90e345680d289d5df7ff469e9b89c60.1633972263.git.naveennaidu479@gmail.com>
Date:   Mon, 11 Oct 2021 23:26:33 +0530
From:   Naveen Naidu <naveennaidu479@...il.com>
To:     bhelgaas@...gle.com
Cc:     Naveen Naidu <naveennaidu479@...il.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Pali Rohár <pali@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-arm-kernel@...ts.infradead.org (moderated list:PCI DRIVER FOR
        AARDVARK (Marvell Armada 3700))
Subject: [PATCH 09/22] PCI: aardvark: Use SET_PCI_ERROR_RESPONSE() when device not found

An MMIO read from a PCI device that doesn't exist or doesn't respond
causes a PCI error.  There's no real data to return to satisfy the
CPU read, so most hardware fabricates ~0 data.

Use SET_PCI_ERROR_RESPONSE() to set the error response, when a faulty
read occurs.

This helps unify PCI error response checking and make error check
consistent and easier to find.

Compile tested only.

Signed-off-by: Naveen Naidu <naveennaidu479@...il.com>
---
 drivers/pci/controller/pci-aardvark.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 596ebcfcc82d..dc2f820ef55f 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -894,7 +894,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
 	int ret;
 
 	if (!advk_pcie_valid_device(pcie, bus, devfn)) {
-		*val = 0xffffffff;
+		SET_PCI_ERROR_RESPONSE(val);
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
@@ -920,7 +920,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
 			*val = CFG_RD_CRS_VAL;
 			return PCIBIOS_SUCCESSFUL;
 		}
-		*val = 0xffffffff;
+		SET_PCI_ERROR_RESPONSE(val);
 		return PCIBIOS_SET_FAILED;
 	}
 
@@ -955,14 +955,14 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
 			*val = CFG_RD_CRS_VAL;
 			return PCIBIOS_SUCCESSFUL;
 		}
-		*val = 0xffffffff;
+		SET_PCI_ERROR_RESPONSE(val);
 		return PCIBIOS_SET_FAILED;
 	}
 
 	/* Check PIO status and get the read result */
 	ret = advk_pcie_check_pio_status(pcie, allow_crs, val);
 	if (ret < 0) {
-		*val = 0xffffffff;
+		SET_PCI_ERROR_RESPONSE(val);
 		return PCIBIOS_SET_FAILED;
 	}
 
-- 
2.25.1