From: Christoph Hellwig hch@lst.de
[ Upstream commit 83b4605b0c16cde5b00c8cf192408d51eab75402 ]
We need to return an error for any call that asks for MSI / MSI-X vectors only, so that non-trivial fallback logic can work properly.
Also valid dev->irq and use the "correct" errno value based on feedback from Linus.
Signed-off-by: Christoph Hellwig hch@lst.de Reported-by: Steven Rostedt rostedt@goodmis.org Fixes: aff17164 ("PCI: Provide sensible IRQ vector alloc/free routines") Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- include/linux/pci.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/linux/pci.h b/include/linux/pci.h index 1b711796d989..36522905685b 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1348,9 +1348,9 @@ static inline int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, unsigned int max_vecs, unsigned int flags) { - if (min_vecs > 1) - return -EINVAL; - return 1; + if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1 && dev->irq) + return 1; + return -ENOSPC; } static inline void pci_free_irq_vectors(struct pci_dev *dev) {