thermal: intel: int340x: Allow limited thermal MSI support

On some Lunar Lake pre-production systems, not all the MSI thermal
vectors are valid. In that case instead of failing module load, continue
with partial thermal interrupt support.

pci_alloc_irq_vectors() can return less than expected maximum vectors.
In that case call devm_request_threaded_irq() only for current maximum
vectors.

Fixes: 7a9a8c5 ("thermal: intel: int340x: Support MSI interrupt for Lunar Lake")
Reported-by: Yijun Shen <[email protected]>
Tested-by: Yijun Shen <[email protected]>
Signed-off-by: Srinivas Pandruvada <[email protected]>
Reviewed-by: Zhang Rui <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: spandruvada

drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c

@@ -292,18 +292,18 @@ static void proc_thermal_free_msi(struct pci_dev *pdev, struct proc_thermal_pci
 
 static int proc_thermal_setup_msi(struct pci_dev *pdev, struct proc_thermal_pci *pci_info)
 {
-	int ret, i, irq;
+	int ret, i, irq, count;
 
-	ret = pci_alloc_irq_vectors(pdev, 1, MSI_THERMAL_MAX, PCI_IRQ_MSI | PCI_IRQ_MSIX);
-	if (ret < 0) {
+	count = pci_alloc_irq_vectors(pdev, 1, MSI_THERMAL_MAX, PCI_IRQ_MSI | PCI_IRQ_MSIX);
+	if (count < 0) {
 		dev_err(&pdev->dev, "Failed to allocate vectors!\n");
-		return ret;
+		return count;
 	}
 
 	dev_info(&pdev->dev, "msi enabled:%d msix enabled:%d\n", pdev->msi_enabled,
 		 pdev->msix_enabled);
 
-	for (i = 0; i < MSI_THERMAL_MAX; i++) {
+	for (i = 0; i < count; i++) {
 		irq =  pci_irq_vector(pdev, i);
 
 		ret = devm_request_threaded_irq(&pdev->dev, irq, proc_thermal_irq_handler,