linux-kernel - [PATCH 3/4] MIPS: PCI: Return PCIBIOS_* from tx4927_pci_config

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Message-Id: <20240205133450.5222-4-ilpo.jarvinen@linux.intel.com>
Date: Mon,  5 Feb 2024 15:34:49 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 3/4] MIPS: PCI: Return PCIBIOS_* from tx4927_pci_config_read/write()

pci_ops .read/.write must return PCIBIOS_* codes but
tx4927_pci_config_read/write() return -1 when mkaddr() cannot find
devfn from the root bus. Return PCIBIOS_DEVICE_NOT_FOUND instead and
pass that onward in the call chain instead of overwriting the return
value.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 arch/mips/pci/ops-tx4927.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/mips/pci/ops-tx4927.c b/arch/mips/pci/ops-tx4927.c
index f7802f100401..4dd8b93985fb 100644
--- a/arch/mips/pci/ops-tx4927.c
+++ b/arch/mips/pci/ops-tx4927.c
@@ -60,7 +60,7 @@ static int mkaddr(struct pci_bus *bus, unsigned int devfn, int where,
 {
 	if (bus->parent == NULL &&
 	    devfn >= PCI_DEVFN(TX4927_PCIC_MAX_DEVNU, 0))
-		return -1;
+		return PCIBIOS_DEVICE_NOT_FOUND;
 	__raw_writel(((bus->number & 0xff) << 0x10)
 		     | ((devfn & 0xff) << 0x08) | (where & 0xfc)
 		     | (bus->parent ? 1 : 0),
@@ -140,10 +140,12 @@ static int tx4927_pci_config_read(struct pci_bus *bus, unsigned int devfn,
 				  int where, int size, u32 *val)
 {
 	struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus);
+	int ret;
 
-	if (mkaddr(bus, devfn, where, pcicptr)) {
+	ret = mkaddr(bus, devfn, where, pcicptr);
+	if (ret != PCIBIOS_SUCCESSFUL) {
 		*val = 0xffffffff;
-		return -1;
+		return ret;
 	}
 	switch (size) {
 	case 1:
@@ -162,9 +164,11 @@ static int tx4927_pci_config_write(struct pci_bus *bus, unsigned int devfn,
 				   int where, int size, u32 val)
 {
 	struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus);
+	int ret;
 
-	if (mkaddr(bus, devfn, where, pcicptr))
-		return -1;
+	ret = mkaddr(bus, devfn, where, pcicptr);
+	if (ret != PCIBIOS_SUCCESSFUL)
+		return ret;
 	switch (size) {
 	case 1:
 		icd_writeb(val, where & 3, pcicptr);
-- 
2.39.2