5308 static int append_to_buffer(const char *ubp, OSST_buffer *st_bp, int do_count)  in append_to_buffer()  argument
5312 	for (i=0, offset=st_bp->buffer_bytes;  in append_to_buffer()
5313 	     i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)  in append_to_buffer()
5314 	offset -= st_bp->sg[i].length;  in append_to_buffer()
5315 	if (i == st_bp->sg_segs) {  /* Should never happen */  in append_to_buffer()
5319 	for ( ; i < st_bp->sg_segs && do_count > 0; i++) {  in append_to_buffer()
5320 		cnt = st_bp->sg[i].length - offset < do_count ?  in append_to_buffer()
5321 		      st_bp->sg[i].length - offset : do_count;  in append_to_buffer()
5322 		res = copy_from_user(st_bp->sg[i].address + offset, ubp, cnt);  in append_to_buffer()
5326 		st_bp->buffer_bytes += cnt;  in append_to_buffer()
5341 static int from_buffer(OSST_buffer *st_bp, char *ubp, int do_count)  in from_buffer()  argument
5345 	for (i=0, offset=st_bp->read_pointer;  in from_buffer()
5346 	     i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)  in from_buffer()
5347 		offset -= st_bp->sg[i].length;  in from_buffer()
5348 	if (i == st_bp->sg_segs) {  /* Should never happen */  in from_buffer()
5352 	for ( ; i < st_bp->sg_segs && do_count > 0; i++) {  in from_buffer()
5353 		cnt = st_bp->sg[i].length - offset < do_count ?  in from_buffer()
5354 		      st_bp->sg[i].length - offset : do_count;  in from_buffer()
5355 		res = copy_to_user(ubp, st_bp->sg[i].address + offset, cnt);  in from_buffer()
5359 		st_bp->buffer_bytes -= cnt;  in from_buffer()
5360 		st_bp->read_pointer += cnt;  in from_buffer()
5373 static int osst_zero_buffer_tail(OSST_buffer *st_bp)  in osst_zero_buffer_tail()  argument
5377 	for (i = 0, offset = st_bp->buffer_bytes;  in osst_zero_buffer_tail()
5378 	     i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)  in osst_zero_buffer_tail()
5379 		offset -= st_bp->sg[i].length;  in osst_zero_buffer_tail()
5380 	if (i == st_bp->sg_segs) {  /* Should never happen */  in osst_zero_buffer_tail()
5384 	for (do_count = OS_DATA_SIZE - st_bp->buffer_bytes;  in osst_zero_buffer_tail()
5385 	     i < st_bp->sg_segs && do_count > 0; i++) {  in osst_zero_buffer_tail()
5386 		cnt = st_bp->sg[i].length - offset < do_count ?  in osst_zero_buffer_tail()
5387 		      st_bp->sg[i].length - offset : do_count ;  in osst_zero_buffer_tail()
5388 		memset(st_bp->sg[i].address + offset, 0, cnt);  in osst_zero_buffer_tail()
5401 static int osst_copy_to_buffer(OSST_buffer *st_bp, unsigned char *ptr)  in osst_copy_to_buffer()  argument
5405 	for (i = 0; i < st_bp->sg_segs && do_count > 0; i++) {  in osst_copy_to_buffer()
5406 		cnt = st_bp->sg[i].length < do_count ?  in osst_copy_to_buffer()
5407 		      st_bp->sg[i].length : do_count ;  in osst_copy_to_buffer()
5408 		memcpy(st_bp->sg[i].address, ptr, cnt);  in osst_copy_to_buffer()
5412 	if (do_count || i != st_bp->sg_segs-1) {  /* Should never happen */  in osst_copy_to_buffer()
5422 static int osst_copy_from_buffer(OSST_buffer *st_bp, unsigned char *ptr)  in osst_copy_from_buffer()  argument
5426 	for (i = 0; i < st_bp->sg_segs && do_count > 0; i++) {  in osst_copy_from_buffer()
5427 		cnt = st_bp->sg[i].length < do_count ?  in osst_copy_from_buffer()
5428 		      st_bp->sg[i].length : do_count ;  in osst_copy_from_buffer()
5429 		memcpy(ptr, st_bp->sg[i].address, cnt);  in osst_copy_from_buffer()
5433 	if (do_count || i != st_bp->sg_segs-1) {  /* Should never happen */  in osst_copy_from_buffer()