linux-kernel - Re: [REGRESSION] Failed network caused by: xhci: switch to pci_alloc_irq

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Message-ID: <20170519124625.GA20063@lst.de>
Date:   Fri, 19 May 2017 14:46:25 +0200
From:   Christoph Hellwig <hch@....de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [REGRESSION] Failed network caused by: xhci: switch to
        pci_alloc_irq_vectors

On Fri, May 19, 2017 at 08:37:21AM -0400, Steven Rostedt wrote:
> ktest config bisect ended with:
> 
> ***************************************
> Found bad config: CONFIG_PCI_MSI
> ***************************************

Oh, that's interesting.  I think there's been a bug in the !CONFIG_PCI_MSI
fallback for pci_alloc_irq_vectors since the very beginning.  And it
didn't matter for any driver so far, but xhci has a very odd way
to set MSI(-X) vs legacy interrupts.

Can you try the patch below?


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;
 }