linux-kernel - Re: [PATCH v2 5/9] nvme: Fix invalid call to irq_set_affinity

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Date:	Fri, 17 Jan 2014 12:40:50 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-nvme@...ts.infradead.org,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v2 5/9] nvme: Fix invalid call to irq_set_affinity_hint()

On Fri, Jan 17, 2014 at 9:02 AM, Alexander Gordeev <agordeev@...hat.com> wrote:
> In case MSI-X and MSI initialization failed the function
> irq_set_affinity_hint() is called with uninitialized value
> in dev->entry[0].vector. This update fixes the issue.

dev->entry[0].vector is initialized in nvme_dev_map(), and it's used
for free_irq() above the area of your patch, so I don't think this is
actually a bug, though it might be somewhat confusing.

> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> ---
>  drivers/block/nvme-core.c |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
> index 26d03fa..e292450 100644
> --- a/drivers/block/nvme-core.c
> +++ b/drivers/block/nvme-core.c
> @@ -1790,15 +1790,15 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
>                         vecs = 32;
>                 for (;;) {
>                         result = pci_enable_msi_block(pdev, vecs);
> -                       if (result == 0) {
> -                               for (i = 0; i < vecs; i++)
> -                                       dev->entry[i].vector = i + pdev->irq;
> -                               break;
> +                       if (result > 0) {
> +                               vecs = result;
> +                               continue;
>                         } else if (result < 0) {
>                                 vecs = 1;
> -                               break;
>                         }
> -                       vecs = result;
> +                       for (i = 0; i < vecs; i++)
> +                               dev->entry[i].vector = i + pdev->irq;
> +                       break;
>                 }
>         }
>
> --
> 1.7.7.6
>
> --
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