From 092f73779906899c687c5db58d2603c9619c7763 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Mon, 2 Apr 2012 13:54:13 +0200 Subject: [PATCH] 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: Jiri Slaby Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: linux390@de.ibm.com Cc: linux-s390@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/s390/char/sclp_vt220.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c index b635472ae660..25cf2e8c162a 100644 --- a/drivers/s390/char/sclp_vt220.c +++ b/drivers/s390/char/sclp_vt220.c @@ -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 */ -- 2.20.1