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Date:   Fri, 15 Oct 2021 20:08:58 +0530
From:   Naveen Naidu <>
Cc:     Naveen Naidu <>,,,,
        Jonathan Derrick <>,
        Nirmal Patel <>,
        Lorenzo Pieralisi <>,
        Rob Herring <>,
        Krzysztof WilczyƄski <>
Subject: [PATCH v2 17/24] PCI: vmd: Use RESPONSE_IS_PCI_ERROR() to check read from hardware

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 RESPONSE_IS_PCI_ERROR() to check the response we get when we read
data from hardware.

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

Reviewed-by: Jonathan Derrick <>
Signed-off-by: Naveen Naidu <>
 drivers/pci/controller/vmd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index a5987e52700e..db81bc4cfe8c 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -538,7 +538,7 @@ static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint,
 		int ret;
 		ret = pci_read_config_dword(dev, PCI_REG_VMLOCK, &vmlock);
-		if (ret || vmlock == ~0)
+		if (ret || RESPONSE_IS_PCI_ERROR(&vmlock))
 			return -ENODEV;
 		if (MB2_SHADOW_EN(vmlock)) {

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