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From:   Naveen Naidu <naveennaidu479@gmail.com>
To:     bhelgaas@google.com
Cc:     Naveen Naidu <naveennaidu479@gmail.com>,
        linux-kernel-mentees@lists.linuxfoundation.org,
        linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
        Xiaowei Song <songxiaowei@hisilicon.com>,
        Binghui Wang <wangbinghui@hisilicon.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= <kw@linux.com>
Subject: [PATCH 08/22] PCI: kirin: Use SET_PCI_ERROR_RESPONSE() when device not found
Date:   Mon, 11 Oct 2021 23:25:25 +0530
Message-Id: <d8e423386aad3d78bca575a7521b138508638e3b.1633972263.git.naveennaidu479@gmail.com>
In-Reply-To: <cover.1633972263.git.naveennaidu479@gmail.com>
References: <cover.1633972263.git.naveennaidu479@gmail.com>
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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@gmail.com>
---
 drivers/pci/controller/dwc/pcie-kirin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 026fd1e42a55..a37b59a9e0be 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -331,7 +331,7 @@ static int kirin_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
 	struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
 
 	if (PCI_SLOT(devfn)) {
-		*val = ~0;
+		SET_PCI_ERROR_RESPONSE(val);
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
-- 
2.25.1