75 /* SOF, ADDR, CTRL, LEN1, LEN2, ..., FCS, EOF */
222 	u8 fcs;  member
372  *	gsm_fcs_add	-	update FCS
373  *	@fcs: Current FCS
376  *	Update the FCS to include c. Uses the algorithm in the specification
380 static inline u8 gsm_fcs_add(u8 fcs, u8 c)  in gsm_fcs_add()  argument
382 	return gsm_fcs8[fcs ^ c];  in gsm_fcs_add()
386  *	gsm_fcs_add_block	-	update FCS for a block
387  *	@fcs: Current FCS
391  *	Update the FCS to include c. Uses the algorithm in the specification
395 static inline u8 gsm_fcs_add_block(u8 fcs, u8 *c, int len)  in gsm_fcs_add_block()  argument
398 		fcs = gsm_fcs8[fcs ^ *c++];  in gsm_fcs_add_block()
399 	return fcs;  in gsm_fcs_add_block()
648 #define HDR_LEN		6	/* ADDR CTRL [LEN.2] DATA FCS */
654  *	@len: length excluding header and FCS
669 	m->data = m->buffer + HDR_LEN - 1;	/* Allow for FCS */  in gsm_data_alloc()
779 	u8 *fcs = dp + msg->len;  in __gsm_data_queue()  local
796 	*fcs = gsm_fcs_add_block(INIT_FCS, dp , msg->data - dp);  in __gsm_data_queue()
799 		*fcs = gsm_fcs_add_block(*fcs, msg->data, msg->len);  in __gsm_data_queue()
800 	*fcs = 0xFF - *fcs;  in __gsm_data_queue()
805 	/* Move the header back and adjust the length, also allow for the FCS  in __gsm_data_queue()
1845  *	The fcs holds the header FCS but any data FCS must be added here.
1853 	/* We have to sneak a look at the packet body to do the FCS.  in gsm_queue()
1857 		gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->len);  in gsm_queue()
1863 		gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->received_fcs);  in gsm_queue()
1865 	if (gsm->fcs != GOOD_FCS) {  in gsm_queue()
1868 			pr_debug("BAD FCS %02x\n", gsm->fcs);  in gsm_queue()
1974 			gsm->fcs = INIT_FCS;  in gsm0_receive()
1978 		gsm->fcs = gsm_fcs_add(gsm->fcs, c);  in gsm0_receive()
1983 		gsm->fcs = gsm_fcs_add(gsm->fcs, c);  in gsm0_receive()
1988 		gsm->fcs = gsm_fcs_add(gsm->fcs, c);  in gsm0_receive()
2005 		gsm->fcs = gsm_fcs_add(gsm->fcs, c);  in gsm0_receive()
2024 	case GSM_FCS:		/* FCS follows the packet */  in gsm0_receive()
2063 		   and received at least one byte (the FCS) */  in gsm1_receive()
2065 			/* Extract the FCS */  in gsm1_receive()
2067 			gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->buf[gsm->count]);  in gsm1_receive()
2101 		gsm->fcs = INIT_FCS;  in gsm1_receive()
2104 		gsm->fcs = gsm_fcs_add(gsm->fcs, c);  in gsm1_receive()
2109 		gsm->fcs = gsm_fcs_add(gsm->fcs, c);  in gsm1_receive()
2115 		if (gsm->count > gsm->mru) {	/* Allow one for the FCS */  in gsm1_receive()