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 <nathan@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/87v8zm9pmd.ffs@tglx
*/
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))
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);