> -----Original Message----- > From: Alexander Gordeev [mailto:agordeev@xxxxxxxxxx] > Sent: Tuesday, April 15, 2014 3:07 PM > To: linux-kernel > Cc: Alexander Gordeev; Shahed Shaikh; Dept-HSG Linux NIC Dev; netdev; > linux-pci > Subject: [PATCH] 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@xxxxxxxxxx> > Cc: Dept-HSGLinuxNICDev@xxxxxxxxxx > Cc: netdev@xxxxxxxxxxxxxxx > Cc: linux-pci@xxxxxxxxxxxxxxx > > Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx> Acked-by: Shahed Shaikh <shahed.shaikh@xxxxxxxxxx> Thanks, Shahed > --- > 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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