Hi Christoph,
On Mon, Oct 17, 2016 at 9:28 PM, Christoph Hellwig <hch@xxxxxx> wrote:
> I think I have an idea now - we are accidentally hitting the per-port
> MSI vector case because your SSD only has one AHCI "port". Can you
> try the below patch:
>
> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index ba5f11c..3c2f92b 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -1413,6 +1413,7 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
> if (hpriv->flags & AHCI_HFLAG_NO_MSI)
> return -ENODEV;
>
> + if (n_ports > 1) {
> /*
> * If number of MSIs is less than number of ports then Sharing Last
> * Message mode could be enforced. In this case assume that advantage
> @@ -1434,6 +1435,7 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
> printk(KERN_INFO "ahci: MRSM is on, fallback to single MSI\n");
> pci_free_irq_vectors(pdev);
> }
> + }
>
> /*
> * -ENOSPC indicated we don't have enough vectors. Don't bother trying
This patch solved the issue, thanks a lot.
Cheers.
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