From: Arthur Kiyanovski akiyano@amazon.com
commit 5055dc0348b8b7c168e3296044bccd724e1ae6cd upstream.
The role of ena_calc_max_io_queue_num() is to return the number of queues supported by the device, which means the return value should be >=0.
The function that calls ena_calc_max_io_queue_num(), checks the return value. If it is 0, it means the device reported it supports 0 IO queues. This case is considered an error and is handled by the calling function accordingly.
However the current implementation of ena_calc_max_io_queue_num() is wrong, since when it detects the device supports 0 IO queues, it returns -EFAULT.
In such a case the calling function doesn't detect the error, and therefore doesn't handle it.
This commit changes ena_calc_max_io_queue_num() to return 0 in case the device reported it supports 0 queues, allowing the calling function to properly handle the error case.
Fixes: 736ce3f414cc ("net: ena: make ethtool -l show correct max number of queues") Signed-off-by: Shay Agroskin shayagr@amazon.com Signed-off-by: Arthur Kiyanovski akiyano@amazon.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ---- 1 file changed, 4 deletions(-)
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -4026,10 +4026,6 @@ static u32 ena_calc_max_io_queue_num(str max_num_io_queues = min_t(u32, max_num_io_queues, io_tx_cq_num); /* 1 IRQ for mgmnt and 1 IRQs for each IO direction */ max_num_io_queues = min_t(u32, max_num_io_queues, pci_msix_vec_count(pdev) - 1); - if (unlikely(!max_num_io_queues)) { - dev_err(&pdev->dev, "The device doesn't have io queues\n"); - return -EFAULT; - }
return max_num_io_queues; }