Commit 092f7377 authored by Jiri Slaby's avatar Jiri Slaby Committed by Greg Kroah-Hartman
Browse files

TTY: sclp_vt220, add tty_port 



tty_port will hold tty buffers in the future. So we need to have it
even here. The only needed member here is tty, so let us store it in
the structure now.

Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux390@de.ibm.com
Cc: linux-s390@vger.kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0ea63da2

drivers/s390/char/sclp_vt220.c

+14 −10
Original line number Diff line number Diff line
@@ -56,8 +56,7 @@ struct sclp_vt220_sccb { 
/* Structures and data needed to register tty driver */

static struct tty_driver *sclp_vt220_driver;



/* The tty_struct that the kernel associated with us */

static struct tty_struct *sclp_vt220_tty;

static struct tty_port sclp_vt220_port;



/* Lock to protect internal data from concurrent access */

static spinlock_t sclp_vt220_lock;
@@ -116,6 +115,7 @@ static struct sclp_register sclp_vt220_register = { 
static void

sclp_vt220_process_queue(struct sclp_vt220_request *request)

{

	struct tty_struct *tty;

	unsigned long flags;

	void *page;
@@ -141,8 +141,10 @@ sclp_vt220_process_queue(struct sclp_vt220_request *request) 
	if (request == NULL && sclp_vt220_flush_later)

		sclp_vt220_emit_current();

	/* Check if the tty needs a wake up call */

	if (sclp_vt220_tty != NULL) {

		tty_wakeup(sclp_vt220_tty);

	tty = tty_port_tty_get(&sclp_vt220_port);

	if (tty) {

		tty_wakeup(tty);

		tty_kref_put(tty);

	}

}
@@ -460,11 +462,12 @@ sclp_vt220_write(struct tty_struct *tty, const unsigned char *buf, int count) 
static void

sclp_vt220_receiver_fn(struct evbuf_header *evbuf)

{

	struct tty_struct *tty = tty_port_tty_get(&sclp_vt220_port);

	char *buffer;

	unsigned int count;



	/* Ignore input if device is not open */

	if (sclp_vt220_tty == NULL)

	if (tty == NULL)

		return;



	buffer = (char *) ((addr_t) evbuf + sizeof(struct evbuf_header));
@@ -478,10 +481,11 @@ sclp_vt220_receiver_fn(struct evbuf_header *evbuf) 
		/* Send input to line discipline */

		buffer++;

		count--;

		tty_insert_flip_string(sclp_vt220_tty, buffer, count);

		tty_flip_buffer_push(sclp_vt220_tty);

		tty_insert_flip_string(tty, buffer, count);

		tty_flip_buffer_push(tty);

		break;

	}

	tty_kref_put(tty);

}



/*
@@ -491,7 +495,7 @@ static int 
sclp_vt220_open(struct tty_struct *tty, struct file *filp)

{

	if (tty->count == 1) {

		sclp_vt220_tty = tty;

		tty_port_tty_set(&sclp_vt220_port, tty);

		tty->driver_data = kmalloc(SCLP_VT220_BUF_SIZE, GFP_KERNEL);

		if (tty->driver_data == NULL)

			return -ENOMEM;
@@ -511,7 +515,7 @@ static void 
sclp_vt220_close(struct tty_struct *tty, struct file *filp)

{

	if (tty->count == 1) {

		sclp_vt220_tty = NULL;

		tty_port_tty_set(&sclp_vt220_port, NULL);

		kfree(tty->driver_data);

		tty->driver_data = NULL;

	}
@@ -635,9 +639,9 @@ static int __init __sclp_vt220_init(int num_pages) 
	INIT_LIST_HEAD(&sclp_vt220_empty);

	INIT_LIST_HEAD(&sclp_vt220_outqueue);

	init_timer(&sclp_vt220_timer);

	tty_port_init(&sclp_vt220_port);

	sclp_vt220_current_request = NULL;

	sclp_vt220_buffered_chars = 0;

	sclp_vt220_tty = NULL;

	sclp_vt220_flush_later = 0;



	/* Allocate pages for output buffering */

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