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Subject[PATCH 05/22] PCI: mediatek: Use SET_PCI_ERROR_RESPONSE() when device not found
Date
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/pcie-mediatek.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 2f3f974977a3..aa744ccd1a2a 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -369,13 +369,13 @@ static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,

port = mtk_pcie_find_port(bus, devfn);
if (!port) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}

ret = mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
if (ret)
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);

return ret;
}
--
2.25.1
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