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perf/cxl: Accept an overflow interrupt on MSI message number 0

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cxl_pmu_probe() rejects the PMU when info->irq <= 0, but at that point the
field still holds the MSI/MSI-X message number the device signals overflow
on, not a Linux virq. That number is 0-based, and -1 means no interrupt
support. Message number 0 is valid and pci_irq_vector() takes a 0-based
index, so a compliant device signalling on the first vector fails to probe.

Reject only the no-interrupt case, matching how the CXL mailbox and event
interrupts handle it.

Fixes: 5d7107c727 ("perf: CXL Performance Monitoring Unit driver")
Reported-by: sashiko-bot@kernel.org
Closes: https://sashiko.dev/#/patchset/20260715191454.459673-1-dave@stgolabs.net?part=1
Assisted-by: Claude:claude-opus-4-8
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Richard Cheng <icheng@nvidia.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Dave Jiang 2026-08-05 08:59:04 -07:00 committed by Will Deacon
parent 0326269ed7
commit af06fba457
1 changed files with 1 additions and 1 deletions
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2
drivers/perf/cxl_pmu.c
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@ -986,7 +986,7 @@ static int cxl_pmu_probe(struct device *dev)
.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
};
if (info->irq <= 0)
if (info->irq < 0)
return -EINVAL;
rc = pci_irq_vector(pdev, info->irq);