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tty: core: Add helper fn to deref tty driver name

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Similar to tty_name(), add tty_driver_name() helper to safely
dereference tty->driver->name (otherwise return empty string).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-11-08 13:01:12 -05:00 committed by Greg Kroah-Hartman
parent 25080652a2
commit 0a083eddae
2 changed files with 8 additions and 0 deletions
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7
drivers/tty/tty_io.c
View file

@ -256,6 +256,13 @@ const char *tty_name(const struct tty_struct *tty)
EXPORT_SYMBOL(tty_name);
const char *tty_driver_name(const struct tty_struct *tty)
{
if (!tty || !tty->driver)
return "";
return tty->driver->name;
}
static int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
const char *routine)
{

1
include/linux/tty.h
View file

@ -420,6 +420,7 @@ static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
}
extern const char *tty_name(const struct tty_struct *tty);
extern const char *tty_driver_name(const struct tty_struct *tty);
extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
extern int __tty_check_change(struct tty_struct *tty, int sig);
extern int tty_check_change(struct tty_struct *tty);