From d558285413ea2f934ab90223ba908c30c5113aee Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sat, 18 Dec 2021 11:25:14 +0100 Subject: [PATCH] PCI/MSI: Unbreak pci_irq_get_affinity() The recent cleanup of pci_irq_get_affinity() broke the function for PCI/MSI-X and indices > 0. Only the MSI descriptor for PCI/MSI has more than one affinity mask which can be retrieved via the MSI index. PCI/MSI-X has one descriptor per vector and each has a single affinity mask. Use index 0 when accessing the affinity mask in the MSI descriptor when MSI-X is enabled. Fixes: f48235900182 ("PCI/MSI: Simplify pci_irq_get_affinity()") Reported-by: Nathan Chancellor Signed-off-by: Thomas Gleixner Tested-by: Nathan Chancellor Link: https://lore.kernel.org/r/87v8zm9pmd.ffs@tglx --- drivers/pci/msi/msi.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c index 7180241..c19c7ca 100644 --- a/drivers/pci/msi/msi.c +++ b/drivers/pci/msi/msi.c @@ -1100,7 +1100,7 @@ EXPORT_SYMBOL(pci_irq_vector); */ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) { - int irq = pci_irq_vector(dev, nr); + int idx, irq = pci_irq_vector(dev, nr); struct msi_desc *desc; if (WARN_ON_ONCE(irq <= 0)) @@ -1113,7 +1113,13 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) if (WARN_ON_ONCE(!desc->affinity)) return NULL; - return &desc->affinity[nr].mask; + + /* + * MSI has a mask array in the descriptor. + * MSI-X has a single mask. + */ + idx = dev->msi_enabled ? nr : 0; + return &desc->affinity[idx].mask; } EXPORT_SYMBOL(pci_irq_get_affinity); -- 2.7.4