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: 7a9a8c5faf41 ("thermal: intel: int340x: Support MSI interrupt for Lunar Lake")
Reported-by: Yijun Shen <Yijun.Shen@dell.com>
Tested-by: Yijun Shen <Yijun.Shen@dell.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Link: https://patch.msgid.link/20240723140228.865919-3-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
index 2c9c45eb5b4a2bb7cc813776f67826779a8120cf..ff296626c49898ac88f3e24648850a16dafcae40 100644 (file)
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ b/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,