Hi Emmanuel,
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
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