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| author |   Greg Kroah-Hartman <gregkh@suse.de> | 2011-10-19 08:33:21 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-10-19 08:33:21 -0700 |
| commit | a0340703981baa6cc1e9c7c768095a0a4e718daf (patch) | |
| tree | 36486da94ffe0c236b9c98aac58971a9dd8da34b /drivers/tty | |
| parent | tty/serial: atmel_serial: add device tree support (diff) | |
| download | linux-dev-a0340703981baa6cc1e9c7c768095a0a4e718daf.tar.xz linux-dev-a0340703981baa6cc1e9c7c768095a0a4e718daf.zip | |
Revert "TTY: call tty_driver_lookup_tty unconditionally"
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@suse.cz>
Cc: stable <stable@vger.kernel.org>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | 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 0425170d9ed6..767ecbb4761a 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) { |