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authorJiri Slaby <jslaby@suse.cz>2012-04-02 13:54:12 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-09 11:28:16 -0700
commit0ea63da2ffa54f6196405010379d56f0c8085b7e (patch)
treeda26d0e3806fd09127d93bb58400e6dd59da6bec /drivers/s390/char/sclp_tty.c
parentfe2fc9ca5d7e5d9144a4039d89a6f1f8967d9263 (diff)
downloadlinux-stericsson-0ea63da2ffa54f6196405010379d56f0c8085b7e.tar.gz
TTY: sclp_tty, 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 <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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390/char/sclp_tty.c')
-rw-r--r--drivers/s390/char/sclp_tty.c33
1 files changed, 19 insertions, 14 deletions
diff --git a/drivers/s390/char/sclp_tty.c b/drivers/s390/char/sclp_tty.c
index 40a9d69c898e..e66a75b3822c 100644
--- a/drivers/s390/char/sclp_tty.c
+++ b/drivers/s390/char/sclp_tty.c
@@ -48,7 +48,7 @@ static struct sclp_buffer *sclp_ttybuf;
/* Timer for delayed output of console messages. */
static struct timer_list sclp_tty_timer;
-static struct tty_struct *sclp_tty;
+static struct tty_port sclp_port;
static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
static unsigned short int sclp_tty_chars_count;
@@ -64,7 +64,7 @@ static int sclp_tty_columns = 80;
static int
sclp_tty_open(struct tty_struct *tty, struct file *filp)
{
- sclp_tty = tty;
+ tty_port_tty_set(&sclp_port, tty);
tty->driver_data = NULL;
tty->low_latency = 0;
return 0;
@@ -76,7 +76,7 @@ sclp_tty_close(struct tty_struct *tty, struct file *filp)
{
if (tty->count > 1)
return;
- sclp_tty = NULL;
+ tty_port_tty_set(&sclp_port, NULL);
}
/*
@@ -108,6 +108,7 @@ sclp_tty_write_room (struct tty_struct *tty)
static void
sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
{
+ struct tty_struct *tty;
unsigned long flags;
void *page;
@@ -126,8 +127,10 @@ sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
spin_unlock_irqrestore(&sclp_tty_lock, flags);
} while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
/* check if the tty needs a wake up call */
- if (sclp_tty != NULL) {
- tty_wakeup(sclp_tty);
+ tty = tty_port_tty_get(&sclp_port);
+ if (tty != NULL) {
+ tty_wakeup(tty);
+ tty_kref_put(tty);
}
}
@@ -326,21 +329,22 @@ sclp_tty_flush_buffer(struct tty_struct *tty)
static void
sclp_tty_input(unsigned char* buf, unsigned int count)
{
+ struct tty_struct *tty = tty_port_tty_get(&sclp_port);
unsigned int cchar;
/*
* If this tty driver is currently closed
* then throw the received input away.
*/
- if (sclp_tty == NULL)
+ if (tty == NULL)
return;
- cchar = ctrlchar_handle(buf, count, sclp_tty);
+ cchar = ctrlchar_handle(buf, count, tty);
switch (cchar & CTRLCHAR_MASK) {
case CTRLCHAR_SYSRQ:
break;
case CTRLCHAR_CTRL:
- tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL);
- tty_flip_buffer_push(sclp_tty);
+ tty_insert_flip_char(tty, cchar, TTY_NORMAL);
+ tty_flip_buffer_push(tty);
break;
case CTRLCHAR_NONE:
/* send (normal) input to line discipline */
@@ -348,13 +352,14 @@ sclp_tty_input(unsigned char* buf, unsigned int count)
(strncmp((const char *) buf + count - 2, "^n", 2) &&
strncmp((const char *) buf + count - 2, "\252n", 2))) {
/* add the auto \n */
- tty_insert_flip_string(sclp_tty, buf, count);
- tty_insert_flip_char(sclp_tty, '\n', TTY_NORMAL);
+ tty_insert_flip_string(tty, buf, count);
+ tty_insert_flip_char(tty, '\n', TTY_NORMAL);
} else
- tty_insert_flip_string(sclp_tty, buf, count - 2);
- tty_flip_buffer_push(sclp_tty);
+ tty_insert_flip_string(tty, buf, count - 2);
+ tty_flip_buffer_push(tty);
break;
}
+ tty_kref_put(tty);
}
/*
@@ -543,7 +548,7 @@ sclp_tty_init(void)
sclp_tty_tolower = 1;
}
sclp_tty_chars_count = 0;
- sclp_tty = NULL;
+ tty_port_init(&sclp_port);
rc = sclp_register(&sclp_input_event);
if (rc) {