[PATCH RFC 34/77] ioat: Update MSI/MSI-X interrupts enablement code

[Alexander Gordeev <agordeev@redhat.com>]

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 drivers/dma/ioat/dma.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index acee3b2..b352ee6 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -915,15 +915,19 @@ int ioat_dma_setup_interrupts(struct ioatdma_device *device)
 
 msix:
 	/* The number of MSI-X vectors should equal the number of channels */
+	err = pci_msix_table_size(pdev);
+	if (err < 0)
+		goto msi;
+	if (err < device->common.chancnt)
+		goto msix_single_vector;
+
 	msixcnt = device->common.chancnt;
 	for (i = 0; i < msixcnt; i++)
 		device->msix_entries[i].entry = i;
 
 	err = pci_enable_msix(pdev, device->msix_entries, msixcnt);
-	if (err < 0)
+	if (err)
 		goto msi;
-	if (err > 0)
-		goto msix_single_vector;
 
 	for (i = 0; i < msixcnt; i++) {
 		msix = &device->msix_entries[i];
-- 
1.7.7.6