This reverts commit 631180aca723cb92e128fdac5fd144e913ca84e5. It caused problems when /dev/tty is a pty: https://lkml.org/lkml/2011/10/12/401 Cc: Jiri Slaby <jslaby@xxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Cc: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx> Cc: Alan Cox <alan@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> --- drivers/tty/tty_io.c | 21 ++++++++++++--------- 1 files changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 0425170..767ecbb 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1821,7 +1821,7 @@ int tty_release(struct inode *inode, struct file *filp) static int tty_open(struct inode *inode, struct file *filp) { - struct tty_struct *tty; + struct tty_struct *tty = NULL; int noctty, retval; struct tty_driver *driver; int index; @@ -1892,14 +1892,17 @@ retry_open: return -ENODEV; } got_driver: - /* check whether we're reopening an existing tty */ - tty = tty_driver_lookup_tty(driver, inode, index); - if (IS_ERR(tty)) { - tty_unlock(); - mutex_unlock(&tty_mutex); - tty_driver_kref_put(driver); - tty_free_file(filp); - return PTR_ERR(tty); + if (!tty) { + /* check whether we're reopening an existing tty */ + tty = tty_driver_lookup_tty(driver, inode, index); + + if (IS_ERR(tty)) { + tty_unlock(); + mutex_unlock(&tty_mutex); + tty_driver_kref_put(driver); + tty_free_file(filp); + return PTR_ERR(tty); + } } if (tty) { -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
