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USB-serial fix for v4.20-rc6

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Here's a fix for a reported USB-console regression in 4.18 which
 revealed a long-standing bug in the console implementation.
 
 The patch has been in linux-next over night with no reported issues.
 
 Signed-off-by: Johan Hovold <johan@kernel.org>
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Merge tag 'usb-serial-4.20-rc6' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-linus

Johan writes:

USB-serial fix for v4.20-rc6

Here's a fix for a reported USB-console regression in 4.18 which
revealed a long-standing bug in the console implementation.

The patch has been in linux-next over night with no reported issues.

Signed-off-by: Johan Hovold <johan@kernel.org>

* tag 'usb-serial-4.20-rc6' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: console: fix reported terminal settings
This commit is contained in:
Greg Kroah-Hartman 2018-12-06 18:02:58 +01:00
commit 3caad34eab
3 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/tty/tty_io.c
View File

@ -1373,7 +1373,13 @@ err_release_lock:
return ERR_PTR(retval);
}
static void tty_free_termios(struct tty_struct *tty)
/**
* tty_save_termios() - save tty termios data in driver table
* @tty: tty whose termios data to save
*
* Locking: Caller guarantees serialisation with tty_init_termios().
*/
void tty_save_termios(struct tty_struct *tty)
{
struct ktermios *tp;
int idx = tty->index;
@ -1392,6 +1398,7 @@ static void tty_free_termios(struct tty_struct *tty)
}
*tp = tty->termios;
}
EXPORT_SYMBOL_GPL(tty_save_termios);
/**
* tty_flush_works - flush all works of a tty/pty pair
@ -1491,7 +1498,7 @@ static void release_tty(struct tty_struct *tty, int idx)
WARN_ON(!mutex_is_locked(&tty_mutex));
if (tty->ops->shutdown)
tty->ops->shutdown(tty);
tty_free_termios(tty);
tty_save_termios(tty);
tty_driver_remove_tty(tty->driver, tty);
tty->port->itty = NULL;
if (tty->link)

2
drivers/usb/serial/console.c
View File

@ -101,7 +101,6 @@ static int usb_console_setup(struct console *co, char *options)
cflag |= PARENB;
break;
}
co->cflag = cflag;
/*
* no need to check the index here: if the index is wrong, console
@ -164,6 +163,7 @@ static int usb_console_setup(struct console *co, char *options)
serial->type->set_termios(tty, port, &dummy);
tty_port_tty_set(&port->port, NULL);
tty_save_termios(tty);
tty_kref_put(tty);
}
tty_port_set_initialized(&port->port, 1);

1
include/linux/tty.h
View File

@ -556,6 +556,7 @@ extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
extern void tty_release_struct(struct tty_struct *tty, int idx);
extern int tty_release(struct inode *inode, struct file *filp);
extern void tty_init_termios(struct tty_struct *tty);
extern void tty_save_termios(struct tty_struct *tty);
extern int tty_standard_install(struct tty_driver *driver,
struct tty_struct *tty);