3591 static int append_to_buffer(const char *ubp, ST_buffer * st_bp, int do_count)  in append_to_buffer()  argument
3595 	for (i = 0, offset = st_bp->buffer_bytes;  in append_to_buffer()
3596 	     i < st_bp->sg_segs && offset >= st_bp->sg_lengths[i]; i++)  in append_to_buffer()
3597 		offset -= st_bp->sg_lengths[i];  in append_to_buffer()
3598 	if (i == st_bp->sg_segs) {	/* Should never happen */  in append_to_buffer()
3602 	for (; i < st_bp->sg_segs && do_count > 0; i++) {  in append_to_buffer()
3603 		cnt = st_bp->sg_lengths[i] - offset < do_count ?  in append_to_buffer()
3604 		    st_bp->sg_lengths[i] - offset : do_count;  in append_to_buffer()
3605 		res = copy_from_user(st_bp->sg[i].address + offset, ubp, cnt);  in append_to_buffer()
3609 		st_bp->buffer_bytes += cnt;  in append_to_buffer()
3624 static int from_buffer(ST_buffer * st_bp, char *ubp, int do_count)  in from_buffer()  argument
3628 	for (i = 0, offset = st_bp->read_pointer;  in from_buffer()
3629 	     i < st_bp->sg_segs && offset >= st_bp->sg_lengths[i]; i++)  in from_buffer()
3630 		offset -= st_bp->sg_lengths[i];  in from_buffer()
3631 	if (i == st_bp->sg_segs) {	/* Should never happen */  in from_buffer()
3635 	for (; i < st_bp->sg_segs && do_count > 0; i++) {  in from_buffer()
3636 		cnt = st_bp->sg_lengths[i] - offset < do_count ?  in from_buffer()
3637 		    st_bp->sg_lengths[i] - offset : do_count;  in from_buffer()
3638 		res = copy_to_user(ubp, st_bp->sg[i].address + offset, cnt);  in from_buffer()
3642 		st_bp->buffer_bytes -= cnt;  in from_buffer()
3643 		st_bp->read_pointer += cnt;  in from_buffer()
3657 static void move_buffer_data(ST_buffer * st_bp, int offset)  in move_buffer_data()  argument
3665 	total=st_bp->buffer_bytes - offset;  in move_buffer_data()
3666 	for (src_seg=0; src_seg < st_bp->sg_segs; src_seg++) {  in move_buffer_data()
3668 		if (src_offset < st_bp->sg_lengths[src_seg])  in move_buffer_data()
3670 		offset -= st_bp->sg_lengths[src_seg];  in move_buffer_data()
3672 	if (src_seg == st_bp->sg_segs) {	/* Should never happen */  in move_buffer_data()
3677 	st_bp->buffer_bytes = st_bp->read_pointer = total;  in move_buffer_data()
3679 		count = min(st_bp->sg_lengths[dst_seg] - dst_offset,  in move_buffer_data()
3680 			    st_bp->sg_lengths[src_seg] - src_offset);  in move_buffer_data()
3681 		memmove(st_bp->sg[dst_seg].address + dst_offset,  in move_buffer_data()
3682 			st_bp->sg[src_seg].address + src_offset, count);  in move_buffer_data()
3686 		if (src_offset >= st_bp->sg_lengths[src_seg]) {  in move_buffer_data()
3691 		if (dst_offset >= st_bp->sg_lengths[dst_seg]) {  in move_buffer_data()
3702 static int set_sg_lengths(ST_buffer *st_bp, unsigned int length)  in set_sg_lengths()  argument
3706 	for (i=0; i < st_bp->sg_segs; i++) {  in set_sg_lengths()
3707 		if (length > st_bp->sg_lengths[i])  in set_sg_lengths()
3708 			st_bp->sg[i].length = st_bp->sg_lengths[i];  in set_sg_lengths()
3710 			st_bp->sg[i].length = length;  in set_sg_lengths()
3713 		length -= st_bp->sg_lengths[i];  in set_sg_lengths()