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Subject[PATCH] qlcnic: Fix MSI-X initialization code
Date
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>
---
drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c | 28 ++++++++++++---------
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 309d056..2e615d5 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)
--
1.7.7.6


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