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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-01-31 22:02:46 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-02-04 09:54:20 +0100 |
| commit | dd7f5a11ac5a6f733f422dc22b4d145d3260304e (patch) | |
| tree | bc96928875c992153dddfecccd8d15ea5aa3c146 | |
| parent | 26291c54e111ff6ba87a164d85d4a4e134b7315c (diff) | |
| download | linux-dm-dd7f5a11ac5a6f733f422dc22b4d145d3260304e.tar.gz | |
PCI/MSI: Remove bogus warning in pci_irq_get_affinity()
The recent overhaul of pci_irq_get_affinity() introduced a regression when
pci_irq_get_affinity() is called for an MSI-X interrupt which was not
allocated with affinity descriptor information.
The original code just returned a NULL pointer in that case, but the rework
added a WARN_ON() under the assumption that the corresponding WARN_ON() in
the MSI case can be applied to MSI-X as well.
In fact the MSI warning in the original code does not make sense either
because it's legitimate to invoke pci_irq_get_affinity() for a MSI
interrupt which was not allocated with affinity descriptor information.
Remove it and just return NULL as the original code did.
Fixes: f48235900182 ("PCI/MSI: Simplify pci_irq_get_affinity()")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/87ee4n38sm.ffs@tglx
| -rw-r--r-- | drivers/pci/msi/msi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c index c19c7ca581868a..9037a7827eca75 100644 --- a/drivers/pci/msi/msi.c +++ b/drivers/pci/msi/msi.c @@ -1111,7 +1111,8 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) if (!desc) return cpu_possible_mask; - if (WARN_ON_ONCE(!desc->affinity)) + /* MSI[X] interrupts can be allocated without affinity descriptor */ + if (!desc->affinity) return NULL; /* |