The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From f723fa4e69920f6a5dd5fa0d10ce90e2f14d189c Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 5 Sep 2017 18:46:47 +0200
Subject: [PATCH] ahci: don't use MSI for devices with the silly Intel NVMe
remapping scheme
Intel AHCI controllers that also hide NVMe devices in their bar
can't use MSI interrupts, so disable them.
Reported-by: John Loy <john.robert.loy@xxxxxxxxx>
Tested-by: John Loy <john.robert.loy@xxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Fixes: d684a90d38e2 ("ahci: per-port msix support")
Cc: stable@xxxxxxxxxxxxxxx # v4.5+
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 5a5fd0b404eb..cb9b0e9090e3 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1469,7 +1469,14 @@ static void ahci_remap_check(struct pci_dev *pdev, int bar,
return;
dev_warn(&pdev->dev, "Found %d remapped NVMe devices.\n", count);
- dev_warn(&pdev->dev, "Switch your BIOS from RAID to AHCI mode to use them.\n");
+ dev_warn(&pdev->dev,
+ "Switch your BIOS from RAID to AHCI mode to use them.\n");
+
+ /*
+ * Don't rely on the msi-x capability in the remap case,
+ * share the legacy interrupt across ahci and remapped devices.
+ */
+ hpriv->flags |= AHCI_HFLAG_NO_MSI;
}
static int ahci_get_irq_vector(struct ata_host *host, int port)