[PATCH RFC 24/77] cxgb3: Update MSI/MSI-X interrupts enablement code

[Alexander Gordeev]

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@xxxxxxxxxx>
---
 drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c |   29 ++++++++++++-----------
 1 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
index 915729c..bf14fd6 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
@@ -3090,25 +3090,26 @@ static int cxgb_enable_msix(struct adapter *adap)
 	int vectors;
 	int i, err;
 
-	vectors = ARRAY_SIZE(entries);
+	err = pci_msix_table_size(adap->pdev);
+	if (err < 0)
+		return err;
+
+	vectors = min_t(int, err, ARRAY_SIZE(entries));
+	if (vectors < (adap->params.nports + 1))
+		return -ENOSPC;
+
 	for (i = 0; i < vectors; ++i)
 		entries[i].entry = i;
 
-	while ((err = pci_enable_msix(adap->pdev, entries, vectors)) > 0)
-		vectors = err;
-
-	if (!err && vectors < (adap->params.nports + 1)) {
-		pci_disable_msix(adap->pdev);
-		err = -ENOSPC;
-	}
+	err = pci_enable_msix(adap->pdev, entries, vectors);
+	if (err)
+		return err;
 
-	if (!err) {
-		for (i = 0; i < vectors; ++i)
-			adap->msix_info[i].vec = entries[i].vector;
-		adap->msix_nvectors = vectors;
-	}
+	for (i = 0; i < vectors; ++i)
+		adap->msix_info[i].vec = entries[i].vector;
+	adap->msix_nvectors = vectors;
 
-	return err;
+	return 0;
 }
 
 static void print_port_info(struct adapter *adap, const struct adapter_info *ai)
-- 
1.7.7.6

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