Merge "USB: gadget: u_bam: Fix NULL pointer deference during disconnect"

static void gbam_notify(void *p, int event, unsigned long data)

{

	struct gbam_port	*port = p;

	struct bam_ch_info *d = &port->data_ch;

	struct bam_ch_info *d;

	struct sk_buff *skb;

	if (port == NULL)

		pr_err("BAM DMUX notifying after channel close\n");

	switch (event) {

	case BAM_DMUX_RECEIVE:

		gbam_data_recv_cb(p, (struct sk_buff *)(data));

		skb = (struct sk_buff *)data;

		if (port)

			gbam_data_recv_cb(p, skb);

		else

			dev_kfree_skb_any(skb);

		break;

	case BAM_DMUX_WRITE_DONE:

		gbam_data_write_done(p, (struct sk_buff *)(data));

		skb = (struct sk_buff *)data;

		if (port)

			gbam_data_write_done(p, skb);

		else

			dev_kfree_skb_any(skb);

		break;

	case BAM_DMUX_TRANSMIT_SIZE:

		d = &port->data_ch;

		if (test_bit(BAM_CH_OPENED, &d->flags))

			pr_warn("%s, BAM channel opened already", __func__);

		bam_mux_rx_req_size = data;