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ttyprintk: Add TTY port shutdown callback 

By adding the TTY port shutdown callback, the final buffer flush has
been moved from tpk_close() to tpk_port_shutdown(). This enables buffer
flush upon close and hangup as well. The change also removes the
specific 'buf == NULL' handling in tpk_printk(), which became useless.

Signed-off-by: Samo Pogačnik <samo_pogacnik@t-2.net>
Link: https://lore.kernel.org/r/f236ea26520fbef176fefec2e06a43548f63fa9c.camel@t-2.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samo Pogačnik 2021-04-27 13:40:51 +02:00 committed by Greg Kroah-Hartman
parent 27dede097d
commit bf3d6ab9bc
1 changed files with 18 additions and 13 deletions
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31
drivers/char/ttyprintk.c
View File

@ -54,11 +54,6 @@ static int tpk_printk(const unsigned char *buf, int count)
{
int i = tpk_curr;
if (buf == NULL) {
tpk_flush();
return i;
}
for (i = 0; i < count; i++) {
if (tpk_curr >= TPK_STR_SIZE) {
/* end of tmp buffer reached: cut the message in two */
@ -100,12 +95,6 @@ static int tpk_open(struct tty_struct *tty, struct file *filp)
static void tpk_close(struct tty_struct *tty, struct file *filp)
{
struct ttyprintk_port *tpkp = tty->driver_data;
unsigned long flags;
spin_lock_irqsave(&tpkp->spinlock, flags);
/* flush tpk_printk buffer */
tpk_printk(NULL, 0);
spin_unlock_irqrestore(&tpkp->spinlock, flags);
tty_port_close(&tpkp->port, tty, filp);
}
@ -168,6 +157,20 @@ static void tpk_hangup(struct tty_struct *tty)
tty_port_hangup(&tpkp->port);
}
/*
* TTY port operations shutdown function.
*/
static void tpk_port_shutdown(struct tty_port *tport)
{
struct ttyprintk_port *tpkp =
container_of(tport, struct ttyprintk_port, port);
unsigned long flags;
spin_lock_irqsave(&tpkp->spinlock, flags);
tpk_flush();
spin_unlock_irqrestore(&tpkp->spinlock, flags);
}
static const struct tty_operations ttyprintk_ops = {
.open = tpk_open,
.close = tpk_close,
@ -177,7 +180,9 @@ static const struct tty_operations ttyprintk_ops = {
.hangup = tpk_hangup,
};
static const struct tty_port_operations null_ops = { };
static const struct tty_port_operations tpk_port_ops = {
.shutdown = tpk_port_shutdown,
};
static struct tty_driver *ttyprintk_driver;
@ -195,7 +200,7 @@ static int __init ttyprintk_init(void)
return PTR_ERR(ttyprintk_driver);
tty_port_init(&tpk_port.port);
tpk_port.port.ops = &null_ops;
tpk_port.port.ops = &tpk_port_ops;
ttyprintk_driver->driver_name = "ttyprintk";
ttyprintk_driver->name = "ttyprintk";