smb: server: pass struct smbdirect_socket to calc_rw_credits()

This will make it easier to move function to the common code
in future.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/server/transport_rdma.c

@@ -1001,11 +1001,9 @@ static int wait_for_rw_credits(struct smbdirect_socket *sc, int credits)
 				credits);
 }
 
-static int calc_rw_credits(struct smb_direct_transport *t,
+static int calc_rw_credits(struct smbdirect_socket *sc,
 			   char *buf, unsigned int len)
 {
-	struct smbdirect_socket *sc = &t->socket;
-
 	return DIV_ROUND_UP(get_buf_page_count(buf, len),
 			    sc->rw_io.credits.num_pages);
 }
@@ -1453,7 +1451,7 @@ static int smb_direct_rdma_xmit(struct smb_direct_transport *t,
 			buf_len = 0;
 		}
 
-		credits_needed += calc_rw_credits(t, desc_buf, desc_buf_len);
+		credits_needed += calc_rw_credits(sc, desc_buf, desc_buf_len);
 		desc_buf += desc_buf_len;
 		buf_len -= desc_buf_len;
 		desc_num++;