linux-kernel - [PATCH] PCI/msi: fix the pci_alloc_irq_vectors

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Message-Id: <20170520132129.16430-2-hch@lst.de>
Date:   Sat, 20 May 2017 15:21:29 +0200
From:   Christoph Hellwig <hch@....de>
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] PCI/msi: fix the pci_alloc_irq_vectors_affinity stub

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.

Signed-off-by: Christoph Hellwig <hch@....de>
Reported-by: Steven Rostedt <rostedt@...dmis.org>
Fixes: aff17164 ("PCI: Provide sensible IRQ vector alloc/free routines")
---
 include/linux/pci.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 33c2b0b77429..5a7fd3b6a7b9 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1342,7 +1342,7 @@ pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
 			       unsigned int max_vecs, unsigned int flags,
 			       const struct irq_affinity *aff_desc)
 {
-	if (min_vecs > 1)
+	if (min_vecs > 1 || !(flags & PCI_IRQ_LEGACY))
 		return -EINVAL;
 	return 1;
 }
-- 
2.11.0