octeontx2-af: initialize action variable

Clang static analysis reports this representative issue
rvu_npc.c:898:15: warning: Assigned value is garbage
  or undefined
  req.match_id = action.match_id;
               ^ ~~~~~~~~~~~~~~~

The initial setting of action is conditional on
 if (is_mcam_entry_enabled(...))
The later check of action.op will sometimes be garbage.
So initialize action.

Reduce setting of
  *(u64 *)&action = 0x00;
to
  *(u64 *)&action = 0;

Fixes: 967db35 ("octeontx2-af: add support for multicast/promisc packet replication feature")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Tom Rix

drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c

@@ -605,7 +605,7 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 	struct npc_install_flow_req req = { 0 };
 	struct npc_install_flow_rsp rsp = { 0 };
 	struct npc_mcam *mcam = &rvu->hw->mcam;
-	struct nix_rx_action action;
+	struct nix_rx_action action = { 0 };
 	int blkaddr, index;
 
 	/* AF's and SDP VFs work in promiscuous mode */
@@ -626,7 +626,6 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 		*(u64 *)&action = npc_get_mcam_action(rvu, mcam,
 						      blkaddr, index);
 	} else {
-		*(u64 *)&action = 0x00;
 		action.op = NIX_RX_ACTIONOP_UCAST;
 		action.pf_func = pcifunc;
 	}
@@ -657,7 +656,7 @@ void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	struct rvu_hwinfo *hw = rvu->hw;
 	int blkaddr, ucast_idx, index;
-	struct nix_rx_action action;
+	struct nix_rx_action action = { 0 };
 	u64 relaxed_mask;
 
 	if (!hw->cap.nix_rx_multicast && is_cgx_vf(rvu, pcifunc))
@@ -685,14 +684,14 @@ void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
 						      blkaddr, ucast_idx);
 
 	if (action.op != NIX_RX_ACTIONOP_RSS) {
-		*(u64 *)&action = 0x00;
+		*(u64 *)&action = 0;
 		action.op = NIX_RX_ACTIONOP_UCAST;
 	}
 
 	/* RX_ACTION set to MCAST for CGX PF's */
 	if (hw->cap.nix_rx_multicast && pfvf->use_mce_list &&
 	    is_pf_cgxmapped(rvu, rvu_get_pf(pcifunc))) {
-		*(u64 *)&action = 0x00;
+		*(u64 *)&action = 0;
 		action.op = NIX_RX_ACTIONOP_MCAST;
 		pfvf = rvu_get_pfvf(rvu, pcifunc & ~RVU_PFVF_FUNC_MASK);
 		action.index = pfvf->promisc_mce_idx;
@@ -832,7 +831,7 @@ void rvu_npc_install_allmulti_entry(struct rvu *rvu, u16 pcifunc, int nixlf,
 	struct rvu_hwinfo *hw = rvu->hw;
 	int blkaddr, ucast_idx, index;
 	u8 mac_addr[ETH_ALEN] = { 0 };
-	struct nix_rx_action action;
+	struct nix_rx_action action = { 0 };
 	struct rvu_pfvf *pfvf;
 	u16 vf_func;
 
@@ -861,14 +860,14 @@ void rvu_npc_install_allmulti_entry(struct rvu *rvu, u16 pcifunc, int nixlf,
 							blkaddr, ucast_idx);
 
 	if (action.op != NIX_RX_ACTIONOP_RSS) {
-		*(u64 *)&action = 0x00;
+		*(u64 *)&action = 0;
 		action.op = NIX_RX_ACTIONOP_UCAST;
 		action.pf_func = pcifunc;
 	}
 
 	/* RX_ACTION set to MCAST for CGX PF's */
 	if (hw->cap.nix_rx_multicast && pfvf->use_mce_list) {
-		*(u64 *)&action = 0x00;
+		*(u64 *)&action = 0;
 		action.op = NIX_RX_ACTIONOP_MCAST;
 		action.index = pfvf->mcast_mce_idx;
 	}