skb_put(skb, urb->actual_length);
	if (!priv->is_rtl8187b) {
		struct rtl8187_rx_hdr *hdr =
			(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
		flags = le32_to_cpu(hdr->flags);
		signal = hdr->signal & 0x7f;
		rx_status.antenna = (hdr->signal >> 7) & 1;
		rx_status.noise = hdr->noise;
		rx_status.mactime = le64_to_cpu(hdr->mac_time);
		priv->quality = signal;
		rx_status.qual = priv->quality;
		priv->noise = hdr->noise;
		rate = (flags >> 20) & 0xF;
		if (rate > 3) { /* OFDM rate */
			if (signal > 90)
				signal = 90;
			else if (signal < 25)
				signal = 25;
			signal = 90 - signal;
		} else {	/* CCK rate */
			if (signal > 95)
				signal = 95;
			else if (signal < 30)
				signal = 30;
			signal = 95 - signal;
		}
		rx_status.signal = signal;
		priv->signal = signal;
	} else {
		struct rtl8187b_rx_hdr *hdr =
			(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
		/* The Realtek datasheet for the RTL8187B shows that the RX
		 * header contains the following quantities: signal quality,
		 * RSSI, AGC, the received power in dB, and the measured SNR.
		 * In testing, none of these quantities show qualitative
		 * agreement with AP signal strength, except for the AGC,
		 * which is inversely proportional to the strength of the
		 * signal. In the following, the quality and signal strength
		 * are derived from the AGC. The arbitrary scaling constants
		 * are chosen to make the results close to the values obtained
		 * for a BCM4312 using b43 as the driver. The noise is ignored
		 * for now.
		 */
		flags = le32_to_cpu(hdr->flags);
		quality = 170 - hdr->agc;
		if (quality > 100)
			quality = 100;
		signal = 14 - hdr->agc / 2;
		rx_status.qual = quality;
		priv->quality = quality;
		rx_status.signal = signal;
		priv->signal = signal;
		rx_status.antenna = (hdr->rssi >> 7) & 1;
		rx_status.mactime = le64_to_cpu(hdr->mac_time);
		rate = (flags >> 20) & 0xF;
	}

	skb_trim(skb, flags & 0x0FFF);
	rx_status.rate_idx = rate;
	rx_status.freq = dev->conf.channel->center_freq;
	rx_status.band = dev->conf.channel->band;
	rx_status.flag |= RX_FLAG_TSFT;
	if (flags & (1 << 13))
		rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
	ieee80211_rx_irqsafe(dev, skb, &rx_status);

	skb = dev_alloc_skb(RTL8187_MAX_RX);
	if (unlikely(!skb)) {
		usb_free_urb(urb);
		/* TODO check rx queue length and refill *somewhere* */
		return;
	}