vmxnet3: round down # of queues to power of two

vmxnet3 device supports only power-of-two number of queues. The driver
therefore needs to check this and rounds down the number of queues to the
nearest power of two.

Signed-off-by: Yong Wang <yongwang@vmware.com>
Signed-off-by: Shreyas N Bhatewara <sbhatewara@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 45a23b2599f3..67402350d0df 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -2947,6 +2947,7 @@ vmxnet3_probe_device(struct pci_dev *pdev,
         else
 #endif
                 num_rx_queues = 1;
+        num_rx_queues = rounddown_pow_of_two(num_rx_queues);
 
         if (enable_mq)
                 num_tx_queues = min(VMXNET3_DEVICE_MAX_TX_QUEUES,
@@ -2954,6 +2955,7 @@ vmxnet3_probe_device(struct pci_dev *pdev,
         else
                 num_tx_queues = 1;
 
+        num_tx_queues = rounddown_pow_of_two(num_tx_queues);
         netdev = alloc_etherdev_mq(sizeof(struct vmxnet3_adapter),
                                    max(num_tx_queues, num_rx_queues));
         printk(KERN_INFO "# of Tx queues : %d, # of Rx queues : %d\n",
@@ -3138,6 +3140,7 @@ vmxnet3_remove_device(struct pci_dev *pdev)
         else
 #endif
                 num_rx_queues = 1;
+        num_rx_queues = rounddown_pow_of_two(num_rx_queues);
 
         cancel_work_sync(&adapter->work);