qlcnic: Fix MSI-X initialization code

Function qlcnic_setup_tss_rss_intr() might enter endless
loop in case pci_enable_msix() contiguously returns a
positive number of MSI-Xs that could have been allocated.
Besides, the function contains 'err = -EIO;' assignment
that never could be reached. This update fixes the
aforementioned issues.

Cc: Shahed Shaikh <shahed.shaikh@qlogic.com>
Cc: Dept-HSGLinuxNICDev@qlogic.com
Cc: netdev@vger.kernel.org
Cc: linux-pci@vger.kernel.org

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Acked-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 12 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index 84d011ed7ec2..dbf75393f758 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -670,7 +670,7 @@ int qlcnic_setup_tss_rss_intr(struct qlcnic_adapter *adapter)
         else
                 num_msix += adapter->drv_tx_rings;
 
-        if (adapter->drv_rss_rings  > 0)
+        if (adapter->drv_rss_rings > 0)
                 num_msix += adapter->drv_rss_rings;
         else
                 num_msix += adapter->drv_sds_rings;
@@ -686,19 +686,15 @@ int qlcnic_setup_tss_rss_intr(struct qlcnic_adapter *adapter)
                         return -ENOMEM;
         }
 
-restore:
         for (vector = 0; vector < num_msix; vector++)
                 adapter->msix_entries[vector].entry = vector;
 
+restore:
         err = pci_enable_msix(pdev, adapter->msix_entries, num_msix);
-        if (err == 0) {
-                adapter->ahw->num_msix = num_msix;
-                if (adapter->drv_tss_rings > 0)
-                        adapter->drv_tx_rings = adapter->drv_tss_rings;
+        if (err > 0) {
+                if (!adapter->drv_tss_rings && !adapter->drv_rss_rings)
+                        return -ENOSPC;
 
-                if (adapter->drv_rss_rings > 0)
-                        adapter->drv_sds_rings = adapter->drv_rss_rings;
-        } else {
                 netdev_info(adapter->netdev,
                             "Unable to allocate %d MSI-X vectors, Available vectors %d\n",
                             num_msix, err);
@@ -716,12 +712,20 @@ restore:
                             "Restoring %d Tx, %d SDS rings for total %d vectors.\n",
                             adapter->drv_tx_rings, adapter->drv_sds_rings,
                             num_msix);
-                goto restore;
 
-                err = -EIO;
+                goto restore;
+        } else if (err < 0) {
+                return err;
         }
 
-        return err;
+        adapter->ahw->num_msix = num_msix;
+        if (adapter->drv_tss_rings > 0)
+                adapter->drv_tx_rings = adapter->drv_tss_rings;
+
+        if (adapter->drv_rss_rings > 0)
+                adapter->drv_sds_rings = adapter->drv_rss_rings;
+
+        return 0;
 }
 
 int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)