[PATCH 4.19 004/196] x86/pci/intel_mid_pci: Fix PCIBIOS_* return code handling

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>

[ Upstream commit 724852059e97c48557151b3aa4af424614819752 ]

intel_mid_pci_irq_enable() uses pci_read_config_byte() that returns
PCIBIOS_* codes. The error handling, however, assumes the codes are
normal errnos because it checks for < 0.

intel_mid_pci_irq_enable() also returns the PCIBIOS_* code back to the
caller but the function is used as the (*pcibios_enable_irq) function
which should return normal errnos.

Convert the error check to plain non-zero check which works for
PCIBIOS_* return codes and convert the PCIBIOS_* return code using
pcibios_err_to_errno() into normal errno before returning it.

Fixes: 5b395e2be6c4 ("x86/platform/intel-mid: Make IRQ allocation a bit more flexible")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240527125538.13620-2-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/x86/pci/intel_mid_pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index eea5a0f3b959b..63513968f5617 100644
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -223,9 +223,9 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
 		return 0;
 
 	ret = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
-	if (ret < 0) {
+	if (ret) {
 		dev_warn(&dev->dev, "Failed to read interrupt line: %d\n", ret);
-		return ret;
+		return pcibios_err_to_errno(ret);
 	}
 
 	switch (intel_mid_identify_cpu()) {
-- 
2.43.0







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