[PATCH bpf-next v2 1/2] i40e: fix possible compiler warning in xsk TX path
From: Magnus Karlsson <magnus.karlsson@intel.com>
Date: 2018-08-31 15:47:35
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
With certain gcc versions, it was possible to get the warning "'tx_desc' may be used uninitialized in this function" for the i40e_xmit_zc. This was not possible, however this commit simplifies the code path so that this warning is no longer emitted. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> --- drivers/net/ethernet/intel/i40e/i40e_xsk.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 94947a8..41ca7e1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c@@ -668,9 +668,8 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) **/ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) { - unsigned int total_packets = 0; + struct i40e_tx_desc *tx_desc = NULL; struct i40e_tx_buffer *tx_bi; - struct i40e_tx_desc *tx_desc; bool work_done = true; dma_addr_t dma; u32 len;
@@ -697,14 +696,13 @@ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP, 0, len, 0); - total_packets++; xdp_ring->next_to_use++; if (xdp_ring->next_to_use == xdp_ring->count) xdp_ring->next_to_use = 0; } - if (total_packets > 0) { + if (tx_desc) { /* Request an interrupt for the last frame and bump tail ptr. */ tx_desc->cmd_type_offset_bsz |= (I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);
--
2.7.4