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Message-Id: <70e5763e4aa58876a7129ac3ccf600efd27162c4.1634825082.git.naveennaidu479@gmail.com>
Date: Thu, 21 Oct 2021 20:37:28 +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,
skhan@...uxfoundation.org
Subject: [PATCH v3 03/25] PCI: 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.
Signed-off-by: Naveen Naidu <naveennaidu479@...il.com>
---
drivers/pci/access.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 0f732ba2f71a..a6bcbad04d89 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -529,7 +529,7 @@ EXPORT_SYMBOL(pcie_capability_clear_and_set_dword);
int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val)
{
if (pci_dev_is_disconnected(dev)) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);
@@ -539,7 +539,7 @@ EXPORT_SYMBOL(pci_read_config_byte);
int pci_read_config_word(const struct pci_dev *dev, int where, u16 *val)
{
if (pci_dev_is_disconnected(dev)) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);
@@ -550,7 +550,7 @@ int pci_read_config_dword(const struct pci_dev *dev, int where,
u32 *val)
{
if (pci_dev_is_disconnected(dev)) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);
--
2.25.1
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