linux-kernel - [PATCH] thermal: int340x: processor_thermal: Support shared interrupts

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Date: Tue, 18 Jun 2024 21:44:24 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: rafael@...nel.org,
	daniel.lezcano@...aro.org,
	rui.zhang@...el.com,
	lukasz.luba@....com
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	stable@...r.kernel.org
Subject: [PATCH] thermal: int340x: processor_thermal: Support shared interrupts

On some systems the processor thermal device interrupt is shared with
other PCI devices. In this case return IRQ_NONE from the interrupt
handler when the interrupt is not for the processor thermal device.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Fixes: f0658708e863 ("thermal: int340x: processor_thermal: Use non MSI interrupts by default")
Cc: <stable@...r.kernel.org> # v6.7+
---
This was only observed on a non production system. So not urgent.

 .../intel/int340x_thermal/processor_thermal_device_pci.c       | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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 14e34eabc419..4a1bfebb1b8e 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
@@ -150,7 +150,7 @@ static irqreturn_t proc_thermal_irq_handler(int irq, void *devid)
 {
 	struct proc_thermal_pci *pci_info = devid;
 	struct proc_thermal_device *proc_priv;
-	int ret = IRQ_HANDLED;
+	int ret = IRQ_NONE;
 	u32 status;
 
 	proc_priv = pci_info->proc_priv;
@@ -175,6 +175,7 @@ static irqreturn_t proc_thermal_irq_handler(int irq, void *devid)
 		/* Disable enable interrupt flag */
 		proc_thermal_mmio_write(pci_info, PROC_THERMAL_MMIO_INT_ENABLE_0, 0);
 		pkg_thermal_schedule_work(&pci_info->work);
+		ret = IRQ_HANDLED;
 	}
 
 	pci_write_config_byte(pci_info->pdev, 0xdc, 0x01);
-- 
2.44.0