s390/hvc_iucv: Automatically assign free HVC terminal devices (4f592219) · Commits · 戴 / test

Add the generic "lnxhvc" terminal ID to automatically assign a HVC terminal when connecting to the HVC IUCV terminal device driver. The terminal device driver tries to find a free (not connected) HVC terminal to satisfy the incoming connection request. With this improvement, you do not longer need to guess which HVC terminal is free, that is, not connected. Also you can still connect to a particular HVC terminal by using its associated terminal ID. Signed-off-by:

Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by:

Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/tty/hvc/hvc_iucv.c

+26 −7

Original line number	Diff line number	Diff line
		@@ -773,16 +773,35 @@ static int hvc_iucv_filter_connreq(u8 ipvmid[8])
		static int hvc_iucv_path_pending(struct iucv_path *path,
		u8 ipvmid[8], u8 ipuser[16])
		{
		struct hvc_iucv_private *priv;
		struct hvc_iucv_private priv, tmp;
		u8 wildcard[9] = "lnxhvc ";
		int i, rc, find_unused;
		u8 nuser_data[16];
		u8 vm_user_id[9];
		int i, rc;

		ASCEBC(wildcard, sizeof(wildcard));
		find_unused = !memcmp(wildcard, ipuser, 8);

		/* First, check if the pending path request is managed by this
		* IUCV handler:
		* - find a disconnected device if ipuser contains the wildcard
		* - find the device that matches the terminal ID in ipuser
		*/
		priv = NULL;
		for (i = 0; i < hvc_iucv_devices; i++)
		if (hvc_iucv_table[i] &&
		(0 == memcmp(hvc_iucv_table[i]->srv_name, ipuser, 8))) {
		priv = hvc_iucv_table[i];
		for (i = 0; i < hvc_iucv_devices; i++) {
		tmp = hvc_iucv_table[i];
		if (!tmp)
		continue;

		if (find_unused) {
		spin_lock(&tmp->lock);
		if (tmp->iucv_state == IUCV_DISCONN)
		priv = tmp;
		spin_unlock(&tmp->lock);

		} else if (!memcmp(tmp->srv_name, ipuser, 8))
		priv = tmp;
		if (priv)
		break;
		}
		if (!priv)

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