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PCI/msi: fix the pci_alloc_irq_vectors_affinity stub

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[ 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2017-05-20 18:59:54 +02:00 • committed by Greg Kroah-Hartman
parent c198e22731
commit 6391346223
1 changed files with 3 additions and 3 deletions
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6
include/linux/pci.h
View file

@ -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)
{