Re: [PATCH v2] cxl/events: Return IRQ_NONE when no event is pending

[Jonathan Cameron <jic23@kernel.org>]

On Sat, 12 Sep 2026 15:08:15 +0530
Shaikh Kamaluddin <shaikhkamal2012@gmail.com> wrote:

> CXL event interrupts may share an MSI/MSI-X vector with other event
> logs or device features. Consequently, cxl_event_thread() is registered
> with IRQF_SHARED and must determine whether the event-log facility
> claimed the interrupt.
> 
> The handler masks the Device Event Status register to the event logs
> supported by the driver. However, when no supported status bit is set,
> it exits the processing loop and still returns IRQ_HANDLED. This
> incorrectly reports that the interrupt was claimed and prevents the
> generic spurious-interrupt detector from accounting it as unhandled.
> 
> Track whether the CXL event handler claimed the interrupt and return
> IRQ_NONE when no supported event is detected. If no handler sharing the
> vector claims a sustained interrupt storm, the generic spurious-
> interrupt detector can eventually identify and disable the affected
> IRQ.
> 
> Signed-off-by: Shaikh Kamaluddin <shaikhkamal2012@gmail.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>