PCI/ERR: Use PCI_POSSIBLE_ERROR() to check config reads

When config pci_ops.read() can detect failed PCI transactions, the data
returned to the CPU is PCI_ERROR_RESPONSE (~0 or 0xffffffff).

Obviously a successful PCI config read may *also* return that data if a
config register happens to contain ~0, so it doesn't definitively indicate
an error unless we know the register cannot contain ~0.

Use PCI_POSSIBLE_ERROR() to check the response we get when we read data
from hardware.  This unifies PCI error response checking and makes error
checks consistent and easier to find.

Link: https://lore.kernel.org/r/f4d18d470cb90f9cb52ea155b01528ba2e76e8d6.1637243717.git.naveennaidu479@gmail.comSigned-off-by: Naveen Naidu <naveennaidu479@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -1115,7 +1115,7 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
 		return -EIO;
 
 	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
-	if (pmcsr == (u16) ~0) {
+	if (PCI_POSSIBLE_ERROR(pmcsr)) {
 		pci_err(dev, "can't change power state from %s to %s (config space inaccessible)\n",
 			pci_power_name(dev->current_state),
 			pci_power_name(state));
@@ -1271,16 +1271,16 @@ static int pci_dev_wait(struct pci_dev *dev, char *reset_type, int timeout)
 	 * After reset, the device should not silently discard config
 	 * requests, but it may still indicate that it needs more time by
 	 * responding to them with CRS completions.  The Root Port will
-	 * generally synthesize ~0 data to complete the read (except when
-	 * CRS SV is enabled and the read was for the Vendor ID; in that
-	 * case it synthesizes 0x0001 data).
+	 * generally synthesize ~0 (PCI_ERROR_RESPONSE) data to complete
+	 * the read (except when CRS SV is enabled and the read was for the
+	 * Vendor ID; in that case it synthesizes 0x0001 data).
 	 *
 	 * Wait for the device to return a non-CRS completion.  Read the
 	 * Command register instead of Vendor ID so we don't have to
 	 * contend with the CRS SV value.
 	 */
 	pci_read_config_dword(dev, PCI_COMMAND, &id);
-	while (id == ~0) {
+	while (PCI_POSSIBLE_ERROR(id)) {
 		if (delay > timeout) {
 			pci_warn(dev, "not ready %dms after %s; giving up\n",
 				 delay - 1, reset_type);

drivers/pci/probe.c

@@ -206,14 +206,14 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 	 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
 	 * 1 must be clear.
 	 */
-	if (sz == 0xffffffff)
+	if (PCI_POSSIBLE_ERROR(sz))
 		sz = 0;
 
 	/*
 	 * I don't know how l can have all bits set.  Copied from old code.
 	 * Maybe it fixes a bug on some ancient platform.
 	 */
-	if (l == 0xffffffff)
+	if (PCI_POSSIBLE_ERROR(l))
 		l = 0;
 
 	if (type == pci_bar_unknown) {
@@ -1683,7 +1683,7 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev)
 
 	if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
 		return PCI_CFG_SPACE_SIZE;
-	if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
+	if (PCI_POSSIBLE_ERROR(status) || pci_ext_cfg_is_aliased(dev))
 		return PCI_CFG_SPACE_SIZE;
 
 	return PCI_CFG_SPACE_EXP_SIZE;
@@ -2371,8 +2371,8 @@ bool pci_bus_generic_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
 	if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
 		return false;
 
-	/* Some broken boards return 0 or ~0 if a slot is empty: */
-	if (*l == 0xffffffff || *l == 0x00000000 ||
+	/* Some broken boards return 0 or ~0 (PCI_ERROR_RESPONSE) if a slot is empty: */
+	if (PCI_POSSIBLE_ERROR(*l) || *l == 0x00000000 ||
 	    *l == 0x0000ffff || *l == 0xffff0000)
 		return false;