[Xen-devel] [PATCH 3/3] AHCI: Use pci_enable_msi_partial() to conserve on 10/16 MSIs

[Alexander Gordeev <agordeev@xxxxxxxxxx>]

Make use of the new pci_enable_msi_partial() interface and
conserve on othewise wasted interrupt resources for 10 out
of 16 unused MSI vectors on Intel chipsets.

Cc: x86@xxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-ide@xxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
 drivers/ata/ahci.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 6070781..0c7a0f3 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1194,7 +1194,7 @@ static int ahci_init_interrupts(struct pci_dev *pdev, 
unsigned int n_ports,
        if (nvec < n_ports)
                goto single_msi;
 
-       rc = pci_enable_msi_exact(pdev, nvec);
+       rc = pci_enable_msi_partial(pdev, n_ports, nvec);
        if (rc == -ENOSPC)
                goto single_msi;
        else if (rc < 0)
@@ -1207,7 +1207,7 @@ static int ahci_init_interrupts(struct pci_dev *pdev, 
unsigned int n_ports,
                goto single_msi;
        }
 
-       return nvec;
+       return n_ports;
 
 single_msi:
        if (pci_enable_msi(pdev))
-- 
1.7.7.6


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