[PATCH 0/3] staging: r8188eu: Remove unused code

[PATCH 0/3] staging: r8188eu: Remove unused code

[Fabio M. De Francesco]

Remove unused code from the r8188eu driver.

Fabio M. De Francesco (3):
  staging: r8188eu: Remove unused nat25_handle_frame()
  staging: r8188eu: Remove all code depending on the NAT25_LOOKUP method
  staging: r8188eu: Remove no more used variable and function

 drivers/staging/r8188eu/core/rtw_br_ext.c    | 263 +------------------
 drivers/staging/r8188eu/include/recv_osdep.h |   1 -
 drivers/staging/r8188eu/include/rtw_br_ext.h |   1 -
 3 files changed, 1 insertion(+), 264 deletions(-)

-- 
2.32.0

[PATCH 1/3] staging: r8188eu: Remove unused nat25_handle_frame()

[Fabio M. De Francesco]

Remove nat25_handle_frame() because it is not called by any other
function of the driver.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---
 drivers/staging/r8188eu/core/rtw_br_ext.c    | 61 --------------------
 drivers/staging/r8188eu/include/recv_osdep.h |  1 -
 2 files changed, 62 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
index 22737cd0fe44..5035f354081f 100644
--- a/drivers/staging/r8188eu/core/rtw_br_ext.c
+++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
@@ -1019,67 +1019,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 	return -1;
 }
 
-int nat25_handle_frame(struct adapter *priv, struct sk_buff *skb)
-{
-	if (!(skb->data[0] & 1)) {
-		int is_vlan_tag = 0, i, retval = 0;
-		unsigned short vlan_hdr = 0;
-		unsigned short protocol;
-
-		protocol = be16_to_cpu(*((__be16 *)(skb->data + 2 * ETH_ALEN)));
-		if (protocol == ETH_P_8021Q) {
-			is_vlan_tag = 1;
-			vlan_hdr = *((unsigned short *)(skb->data+ETH_ALEN*2+2));
-			for (i = 0; i < 6; i++)
-				*((unsigned short *)(skb->data+ETH_ALEN*2+2-i*2)) = *((unsigned short *)(skb->data+ETH_ALEN*2-2-i*2));
-			skb_pull(skb, 4);
-		}
-
-		if (!priv->ethBrExtInfo.nat25_disable) {
-			spin_lock_bh(&priv->br_ext_lock);
-			/*
-			 *	This function look up the destination network address from
-			 *	the NAT2.5 database. Return value = -1 means that the
-			 *	corresponding network protocol is NOT support.
-			 */
-			if (!priv->ethBrExtInfo.nat25sc_disable &&
-			    (be16_to_cpu(*((__be16 *)(skb->data+ETH_ALEN*2))) == ETH_P_IP) &&
-			    !memcmp(priv->scdb_ip, skb->data+ETH_HLEN+16, 4)) {
-				memcpy(skb->data, priv->scdb_mac, ETH_ALEN);
-
-				spin_unlock_bh(&priv->br_ext_lock);
-			} else {
-				spin_unlock_bh(&priv->br_ext_lock);
-
-				retval = nat25_db_handle(priv, skb, NAT25_LOOKUP);
-			}
-		} else {
-			if (((be16_to_cpu(*((__be16 *)(skb->data+ETH_ALEN*2))) == ETH_P_IP) &&
-			    !memcmp(priv->br_ip, skb->data+ETH_HLEN+16, 4)) ||
-			    ((be16_to_cpu(*((__be16 *)(skb->data+ETH_ALEN*2))) == ETH_P_ARP) &&
-			    !memcmp(priv->br_ip, skb->data+ETH_HLEN+24, 4))) {
-				/*  for traffic to upper TCP/IP */
-				retval = nat25_db_handle(priv, skb, NAT25_LOOKUP);
-			}
-		}
-
-		if (is_vlan_tag) {
-			skb_push(skb, 4);
-			for (i = 0; i < 6; i++)
-				*((unsigned short *)(skb->data+i*2)) = *((unsigned short *)(skb->data+4+i*2));
-			*((__be16 *)(skb->data+ETH_ALEN*2)) = __constant_htons(ETH_P_8021Q);
-			*((unsigned short *)(skb->data+ETH_ALEN*2+2)) = vlan_hdr;
-		}
-
-		if (retval == -1) {
-			/* DEBUG_ERR("NAT25: Lookup fail!\n"); */
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
 #define SERVER_PORT			67
 #define CLIENT_PORT			68
 #define DHCP_MAGIC			0x63825363
diff --git a/drivers/staging/r8188eu/include/recv_osdep.h b/drivers/staging/r8188eu/include/recv_osdep.h
index 7308f21c428f..72ddf515071e 100644
--- a/drivers/staging/r8188eu/include/recv_osdep.h
+++ b/drivers/staging/r8188eu/include/recv_osdep.h
@@ -30,7 +30,6 @@ int rtw_os_recvbuf_resource_free(struct adapter *adapt, struct recv_buf *buf);
 void rtw_os_read_port(struct adapter *padapter, struct recv_buf *precvbuf);
 
 void rtw_init_recv_timer(struct recv_reorder_ctrl *preorder_ctrl);
-int nat25_handle_frame(struct adapter *priv, struct sk_buff *skb);
 int _netdev_open(struct net_device *pnetdev);
 int netdev_open(struct net_device *pnetdev);
 int netdev_close(struct net_device *pnetdev);
-- 
2.32.0

[PATCH 2/3] staging: r8188eu: Remove code depending on NAT25_LOOKUP

[Fabio M. De Francesco]

Remove all the code related to the management of the NAT25_LOOKUP
method in nat25_db_handle(). The only function that used that method was
the now deleted nat25_handle_frame(). Remove the NAT25_LOOKUP entry from
the NAT25_METHOD enum because it is not anymore used everywhere else in
the code of the driver.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---
 drivers/staging/r8188eu/core/rtw_br_ext.c    | 150 -------------------
 drivers/staging/r8188eu/include/rtw_br_ext.h |   1 -
 2 files changed, 151 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
index 5035f354081f..5b032406e9d3 100644
--- a/drivers/staging/r8188eu/core/rtw_br_ext.c
+++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
@@ -515,27 +515,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 
 			__nat25_db_print(priv);
 			return 0;
-		case NAT25_LOOKUP:
-			DEBUG_INFO("NAT25: Lookup IP, SA =%08x, DA =%08x\n", iph->saddr, iph->daddr);
-			tmp = be32_to_cpu(iph->daddr);
-			__nat25_generate_ipv4_network_addr(networkAddr, &tmp);
-
-			if (!__nat25_db_network_lookup_and_replace(priv, skb, networkAddr)) {
-				if (*((unsigned char *)&iph->daddr + 3) == 0xff) {
-					/*  L2 is unicast but L3 is broadcast, make L2 bacome broadcast */
-					DEBUG_INFO("NAT25: Set DA as boardcast\n");
-					memset(skb->data, 0xff, ETH_ALEN);
-				} else {
-					/*  forward unknow IP packet to upper TCP/IP */
-					DEBUG_INFO("NAT25: Replace DA with BR's MAC\n");
-					if ((*(u32 *)priv->br_mac) == 0 && (*(u16 *)(priv->br_mac+4)) == 0) {
-						printk("Re-init netdev_br_init() due to br_mac == 0!\n");
-						netdev_br_init(priv->pnetdev);
-					}
-					memcpy(skb->data, priv->br_mac, ETH_ALEN);
-				}
-			}
-			return 0;
 		default:
 			return -1;
 		}
@@ -567,20 +546,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 			__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
 			__nat25_db_print(priv);
 			return 0;
-		case NAT25_LOOKUP:
-			DEBUG_INFO("NAT25: Lookup ARP\n");
-
-			arp_ptr += arp->ar_hln;
-			sender = (unsigned int *)arp_ptr;
-			arp_ptr += (arp->ar_hln + arp->ar_pln);
-			target = (unsigned int *)arp_ptr;
-			__nat25_generate_ipv4_network_addr(networkAddr, target);
-			__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-			/*  change to ARP target mac address to Lookup result */
-			arp_ptr = (unsigned char *)(arp + 1);
-			arp_ptr += (arp->ar_hln + arp->ar_pln);
-			memcpy(arp_ptr, skb->data, ETH_ALEN);
-			return 0;
 		default:
 			return -1;
 		}
@@ -687,22 +652,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 				__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
 				__nat25_db_print(priv);
 				return 0;
-			case NAT25_LOOKUP:
-				if (!memcmp(GET_MY_HWADDR(priv), ipx->ipx_dest.node, ETH_ALEN)) {
-					DEBUG_INFO("NAT25: Lookup IPX, Modify Destination IPX Node addr\n");
-
-					__nat25_generate_ipx_network_addr_with_socket(networkAddr, &ipx->ipx_dest.net, &ipx->ipx_dest.sock);
-
-					__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-
-					/*  replace IPX destination node addr with Lookup destination MAC addr */
-					memcpy(ipx->ipx_dest.node, skb->data, ETH_ALEN);
-				} else {
-					__nat25_generate_ipx_network_addr_with_node(networkAddr, &ipx->ipx_dest.net, ipx->ipx_dest.node);
-
-					__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-				}
-				return 0;
 			default:
 				return -1;
 			}
@@ -732,19 +681,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 
 				__nat25_db_print(priv);
 				return 0;
-			case NAT25_LOOKUP:
-				DEBUG_INFO("NAT25: Lookup AARP, Source =%d,%d Destination =%d,%d\n",
-					ea->pa_src_net,
-					ea->pa_src_node,
-					ea->pa_dst_net,
-					ea->pa_dst_node);
-
-				__nat25_generate_apple_network_addr(networkAddr, &ea->pa_dst_net, &ea->pa_dst_node);
-
-				__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-
-				/*  change to AARP destination mac address to Lookup result */
-				memcpy(ea->hw_dst, skb->data, ETH_ALEN);
 				return 0;
 			default:
 				return -1;
@@ -766,15 +702,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 
 				__nat25_db_print(priv);
 				return 0;
-			case NAT25_LOOKUP:
-				DEBUG_INFO("NAT25: Lookup DDP, Source =%d,%d Destination =%d,%d\n",
-					ddp->deh_snet,
-					ddp->deh_snode,
-					ddp->deh_dnet,
-					ddp->deh_dnode);
-				__nat25_generate_apple_network_addr(networkAddr, &ddp->deh_dnet, &ddp->deh_dnode);
-				__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-				return 0;
 			default:
 				return -1;
 			}
@@ -865,70 +792,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 					priv->pppoe_connection_in_progress = 0;
 			}
 			return 0;
-		case NAT25_LOOKUP:
-			if (ph->code == PADO_CODE || ph->code == PADS_CODE) {
-				if (priv->ethBrExtInfo.addPPPoETag) {
-					struct pppoe_tag *tag;
-					unsigned char *ptr;
-					unsigned short tagType, tagLen;
-					int offset = 0;
-
-					ptr = __nat25_find_pppoe_tag(ph, ntohs(PTT_RELAY_SID));
-					if (!ptr) {
-						DEBUG_ERR("Fail to find PTT_RELAY_SID in FADO!\n");
-						return -1;
-					}
-
-					tag = (struct pppoe_tag *)ptr;
-					tagType = (unsigned short)((ptr[0] << 8) + ptr[1]);
-					tagLen = (unsigned short)((ptr[2] << 8) + ptr[3]);
-
-					if ((tagType != ntohs(PTT_RELAY_SID)) || (tagLen < (MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN))) {
-						DEBUG_ERR("Invalid PTT_RELAY_SID tag length [%d]!\n", tagLen);
-						return -1;
-					}
-
-					pMagic = (unsigned short *)tag->tag_data;
-					if (ntohs(*pMagic) != MAGIC_CODE) {
-						DEBUG_ERR("Can't find MAGIC_CODE in %s packet!\n",
-							(ph->code == PADO_CODE ? "PADO" : "PADS"));
-						return -1;
-					}
-
-					memcpy(skb->data, tag->tag_data+MAGIC_CODE_LEN, ETH_ALEN);
-
-					if (tagLen > MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN)
-						offset = TAG_HDR_LEN;
-
-					if (skb_pull_and_merge(skb, ptr+offset, TAG_HDR_LEN+MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN-offset) < 0) {
-						DEBUG_ERR("call skb_pull_and_merge() failed in PADO packet!\n");
-						return -1;
-					}
-					ph->length = htons(ntohs(ph->length)-(TAG_HDR_LEN+MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN-offset));
-					if (offset > 0)
-						tag->tag_len = htons(tagLen-MAGIC_CODE_LEN-RTL_RELAY_TAG_LEN);
-
-					DEBUG_INFO("NAT25: Lookup PPPoE, forward %s Packet from %s\n",
-						(ph->code == PADO_CODE ? "PADO" : "PADS"),	skb->dev->name);
-				} else { /*  not add relay tag */
-					if (!priv->pppoe_connection_in_progress) {
-						DEBUG_ERR("Discard PPPoE packet due to no connection in progresss!\n");
-						return -1;
-					}
-					memcpy(skb->data, priv->pppoe_addr, ETH_ALEN);
-					priv->pppoe_connection_in_progress = WAIT_TIME_PPPOE;
-				}
-			} else {
-				if (ph->sid != 0) {
-					DEBUG_INFO("NAT25: Lookup PPPoE, lookup session packet from %s\n", skb->dev->name);
-					__nat25_generate_pppoe_network_addr(networkAddr, skb->data+ETH_ALEN, &ph->sid);
-					__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-					__nat25_db_print(priv);
-				} else {
-					return -1;
-				}
-			}
-			return 0;
 		default:
 			return -1;
 		}
@@ -941,8 +804,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 			return -1;
 		case NAT25_INSERT:
 			return 0;
-		case NAT25_LOOKUP:
-			return 0;
 		default:
 			return -1;
 		}
@@ -955,8 +816,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 			return -1;
 		case NAT25_INSERT:
 			return 0;
-		case NAT25_LOOKUP:
-			return 0;
 		default:
 			return -1;
 		}
@@ -1003,15 +862,6 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 				}
 			}
 			return 0;
-		case NAT25_LOOKUP:
-			DEBUG_INFO("NAT25: Lookup IP, SA =%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x, DA =%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x\n",
-				   iph->saddr.s6_addr16[0], iph->saddr.s6_addr16[1], iph->saddr.s6_addr16[2], iph->saddr.s6_addr16[3],
-				   iph->saddr.s6_addr16[4], iph->saddr.s6_addr16[5], iph->saddr.s6_addr16[6], iph->saddr.s6_addr16[7],
-				   iph->daddr.s6_addr16[0], iph->daddr.s6_addr16[1], iph->daddr.s6_addr16[2], iph->daddr.s6_addr16[3],
-				   iph->daddr.s6_addr16[4], iph->daddr.s6_addr16[5], iph->daddr.s6_addr16[6], iph->daddr.s6_addr16[7]);
-			__nat25_generate_ipv6_network_addr(networkAddr, (unsigned int *)&iph->daddr);
-			__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
-			return 0;
 		default:
 			return -1;
 		}
diff --git a/drivers/staging/r8188eu/include/rtw_br_ext.h b/drivers/staging/r8188eu/include/rtw_br_ext.h
index 00d461c4c6fa..69905d30c191 100644
--- a/drivers/staging/r8188eu/include/rtw_br_ext.h
+++ b/drivers/staging/r8188eu/include/rtw_br_ext.h
@@ -31,7 +31,6 @@ enum NAT25_METHOD {
 	NAT25_MIN,
 	NAT25_CHECK,
 	NAT25_INSERT,
-	NAT25_LOOKUP,
 	NAT25_PARSE,
 	NAT25_MAX
 };
-- 
2.32.0

[PATCH 3/3] staging: r8188eu: Remove no more used variable and function

[Fabio M. De Francesco]

Remove the 'sender' pointer to integer. Remove
__nat25_db_network_lookup_and_replace(). Following the deletion of the
code related to the NAT25_LOOKUP method, they are no more needed.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---
 drivers/staging/r8188eu/core/rtw_br_ext.c | 52 +----------------------
 1 file changed, 1 insertion(+), 51 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
index 5b032406e9d3..62864fbbdef3 100644
--- a/drivers/staging/r8188eu/core/rtw_br_ext.c
+++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
@@ -326,56 +326,6 @@ static inline void __network_hash_unlink(struct nat25_network_db_entry *ent)
 	ent->pprev_hash = NULL;
 }
 
-static int __nat25_db_network_lookup_and_replace(struct adapter *priv,
-				struct sk_buff *skb, unsigned char *networkAddr)
-{
-	struct nat25_network_db_entry *db;
-
-	spin_lock_bh(&priv->br_ext_lock);
-
-	db = priv->nethash[__nat25_network_hash(networkAddr)];
-	while (db) {
-		if (!memcmp(db->networkAddr, networkAddr, MAX_NETWORK_ADDR_LEN)) {
-			if (!__nat25_has_expired(priv, db)) {
-				/*  replace the destination mac address */
-				memcpy(skb->data, db->macAddr, ETH_ALEN);
-				atomic_inc(&db->use_count);
-
-				DEBUG_INFO("NAT25: Lookup M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
-							"%02x%02x%02x%02x%02x%02x\n",
-					db->macAddr[0],
-					db->macAddr[1],
-					db->macAddr[2],
-					db->macAddr[3],
-					db->macAddr[4],
-					db->macAddr[5],
-					db->networkAddr[0],
-					db->networkAddr[1],
-					db->networkAddr[2],
-					db->networkAddr[3],
-					db->networkAddr[4],
-					db->networkAddr[5],
-					db->networkAddr[6],
-					db->networkAddr[7],
-					db->networkAddr[8],
-					db->networkAddr[9],
-					db->networkAddr[10],
-					db->networkAddr[11],
-					db->networkAddr[12],
-					db->networkAddr[13],
-					db->networkAddr[14],
-					db->networkAddr[15],
-					db->networkAddr[16]);
-			}
-			spin_unlock_bh(&priv->br_ext_lock);
-			return 1;
-		}
-		db = db->next_hash;
-	}
-	spin_unlock_bh(&priv->br_ext_lock);
-	return 0;
-}
-
 static void __nat25_db_network_insert(struct adapter *priv,
 				unsigned char *macAddr, unsigned char *networkAddr)
 {
@@ -524,7 +474,7 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
 		/*---------------------------------------------------*/
 		struct arphdr *arp = (struct arphdr *)(skb->data + ETH_HLEN);
 		unsigned char *arp_ptr = (unsigned char *)(arp + 1);
-		unsigned int *sender, *target;
+		unsigned int *sender;
 
 		if (arp->ar_pro != __constant_htons(ETH_P_IP)) {
 			DEBUG_WARN("NAT25: arp protocol unknown (%4x)!\n", be16_to_cpu(arp->ar_pro));
-- 
2.32.0

Re: [PATCH 0/3] staging: r8188eu: Remove unused code

[Michael Straube]

On 8/16/21 6:06 PM, Fabio M. De Francesco wrote:
> Remove unused code from the r8188eu driver.
> 
> Fabio M. De Francesco (3):
>    staging: r8188eu: Remove unused nat25_handle_frame()
>    staging: r8188eu: Remove all code depending on the NAT25_LOOKUP method
>    staging: r8188eu: Remove no more used variable and function
> 
>   drivers/staging/r8188eu/core/rtw_br_ext.c    | 263 +------------------
>   drivers/staging/r8188eu/include/recv_osdep.h |   1 -
>   drivers/staging/r8188eu/include/rtw_br_ext.h |   1 -
>   3 files changed, 1 insertion(+), 264 deletions(-)
> 

Acked-by: Michael Straube <straube.linux@gmail.com>

Looks good to me, thanks.

Regards,
Michael

Re: [PATCH 0/3] staging: r8188eu: Remove unused code

[Greg Kroah-Hartman]

On Mon, Aug 16, 2021 at 06:06:14PM +0200, Fabio M. De Francesco wrote:
> Remove unused code from the r8188eu driver.
> 
> Fabio M. De Francesco (3):
>   staging: r8188eu: Remove unused nat25_handle_frame()
>   staging: r8188eu: Remove all code depending on the NAT25_LOOKUP method
>   staging: r8188eu: Remove no more used variable and function
> 
>  drivers/staging/r8188eu/core/rtw_br_ext.c    | 263 +------------------
>  drivers/staging/r8188eu/include/recv_osdep.h |   1 -
>  drivers/staging/r8188eu/include/rtw_br_ext.h |   1 -
>  3 files changed, 1 insertion(+), 264 deletions(-)

Patch 2/3 did not apply, can you please rebase and resend the remaining
2 patches against my latest tree?

thanks,

greg k-h

Re: [PATCH 0/3] staging: r8188eu: Remove unused code

[Fabio M. De Francesco]

On Monday, August 16, 2021 6:49:59 PM CEST Greg Kroah-Hartman wrote:
> On Mon, Aug 16, 2021 at 06:06:14PM +0200, Fabio M. De Francesco wrote:
> > Remove unused code from the r8188eu driver.
> > 
> > Fabio M. De Francesco (3):
> >   staging: r8188eu: Remove unused nat25_handle_frame()
> >   staging: r8188eu: Remove all code depending on the NAT25_LOOKUP method
> >   staging: r8188eu: Remove no more used variable and function
> >  
> >  drivers/staging/r8188eu/core/rtw_br_ext.c    | 263 +------------------
> >  drivers/staging/r8188eu/include/recv_osdep.h |   1 -
> >  drivers/staging/r8188eu/include/rtw_br_ext.h |   1 -
> >  3 files changed, 1 insertion(+), 264 deletions(-)
> 
> Patch 2/3 did not apply, can you please rebase and resend the remaining
> 2 patches against my latest tree?

Sure. I've already sent them:

"[PATCH v2 2/3] staging: r8188eu: Remove code depending on NAT25_LOOKUP", 
https://lkml.org/lkml/2021/8/16/1082;
"[PATCH v2 3/3] staging: r8188eu: Remove no more used variable and function",
https://lkml.org/lkml/2021/8/16/1094.

Thanks,

Fabio
 
> thanks,
> 
> greg k-h