static int capinc_tty_put_char()

in capi/capi.c [1115:1154]

• 34 lines of code
• 5 McCabe index (conditional complexity)

static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
{
	struct capiminor *mp = tty->driver_data;
	bool invoke_send = false;
	struct sk_buff *skb;
	int ret = 1;

	pr_debug("capinc_put_char(%u)\n", ch);

	spin_lock_bh(&mp->outlock);
	skb = mp->outskb;
	if (skb) {
		if (skb_tailroom(skb) > 0) {
			skb_put_u8(skb, ch);
			goto unlock_out;
		}
		mp->outskb = NULL;
		__skb_queue_tail(&mp->outqueue, skb);
		mp->outbytes += skb->len;
		invoke_send = true;
	}

	skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
	if (skb) {
		skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
		skb_put_u8(skb, ch);
		mp->outskb = skb;
	} else {
		printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
		ret = 0;
	}

unlock_out:
	spin_unlock_bh(&mp->outlock);

	if (invoke_send)
		handle_minor_send(mp);

	return ret;
}