Messages in this thread Patch in this message | | | Date | Fri, 04 Feb 2022 08:57:45 -0000 | From | "tip-bot2 for Thomas Gleixner" <> | Subject | [tip: irq/urgent] PCI/MSI: Remove bogus warning in pci_irq_get_affinity() |
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The following commit has been merged into the irq/urgent branch of tip:
Commit-ID: dd7f5a11ac5a6f733f422dc22b4d145d3260304e Gitweb: https://git.kernel.org/tip/dd7f5a11ac5a6f733f422dc22b4d145d3260304e Author: Thomas Gleixner <tglx@linutronix.de> AuthorDate: Mon, 31 Jan 2022 22:02:46 +01:00 Committer: Thomas Gleixner <tglx@linutronix.de> CommitterDate: Fri, 04 Feb 2022 09:54:20 +01:00
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
--- drivers/pci/msi/msi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c index c19c7ca..9037a78 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; /*
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