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platform_kernel-5.15
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TTY: pdc_cons, use tty_port 

Instead of digging a tty out of the tty_driver struct, which is not
defined to work, use tty_port properly. This includes proper tty
refcounting even though there is no possible race currently. But we
will need tty_port for tty buffers in the future anyway.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-03-05 14:52:53 +01:00 committed by Greg Kroah-Hartman
parent 0b479d54ae
commit 5dd5bc40f3
1 changed files with 12 additions and 7 deletions
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19
arch/parisc/kernel/pdc_cons.c
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@ -92,10 +92,11 @@ static int pdc_console_setup(struct console *co, char *options)
static void pdc_console_poll(unsigned long unused); static void pdc_console_poll(unsigned long unused);
static DEFINE_TIMER(pdc_console_timer, pdc_console_poll, 0, 0); static DEFINE_TIMER(pdc_console_timer, pdc_console_poll, 0, 0);
static struct tty_port tty_port;
static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp) static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
{ {
tty_port_tty_set(&tty_port, tty);
mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
return 0; return 0;
@ -103,8 +104,10 @@ static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp) static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
{ {
if (!tty->count) if (!tty->count) {
del_timer_sync(&pdc_console_timer); del_timer_sync(&pdc_console_timer);
tty_port_tty_set(&tty_port, NULL);
}
} }
static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
@ -123,8 +126,6 @@ static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty)
return 0; /* no buffer */ return 0; /* no buffer */
} }
static struct tty_driver *pdc_console_tty_driver;
static const struct tty_operations pdc_console_tty_ops = { static const struct tty_operations pdc_console_tty_ops = {
.open = pdc_console_tty_open, .open = pdc_console_tty_open,
.close = pdc_console_tty_close, .close = pdc_console_tty_close,
@ -135,10 +136,8 @@ static const struct tty_operations pdc_console_tty_ops = {
static void pdc_console_poll(unsigned long unused) static void pdc_console_poll(unsigned long unused)
{ {
int data, count = 0; int data, count = 0;
struct tty_struct *tty = tty_port_tty_get(&tty_port);
struct tty_struct *tty = pdc_console_tty_driver->ttys[0];
if (!tty) if (!tty)
return; return;
@ -154,10 +153,14 @@ static void pdc_console_poll(unsigned long unused)
if (count) if (count)
tty_flip_buffer_push(tty); tty_flip_buffer_push(tty);
tty_kref_put(tty);
if (pdc_cons.flags & CON_ENABLED) if (pdc_cons.flags & CON_ENABLED)
mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
} }
static struct tty_driver *pdc_console_tty_driver;
static int __init pdc_console_tty_driver_init(void) static int __init pdc_console_tty_driver_init(void)
{ {
int err; int err;
@ -182,6 +185,8 @@ static int __init pdc_console_tty_driver_init(void)
printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n"); printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n");
pdc_cons.flags &= ~CON_BOOT; pdc_cons.flags &= ~CON_BOOT;
tty_port_init(&tty_port);
pdc_console_tty_driver = alloc_tty_driver(1); pdc_console_tty_driver = alloc_tty_driver(1);
if (!pdc_console_tty_driver) if (!pdc_console_tty_driver)