diff options
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 103 |
1 files changed, 96 insertions, 7 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index da912517d295..94cccb6efa32 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -280,7 +280,7 @@ static int check_tty_count(struct tty_struct *tty, const char *routine) { #ifdef CHECK_TTY_COUNT struct list_head *p; - int count = 0; + int count = 0, kopen_count = 0; spin_lock(&tty->files_lock); list_for_each(p, &tty->tty_files) { @@ -291,10 +291,12 @@ static int check_tty_count(struct tty_struct *tty, const char *routine) tty->driver->subtype == PTY_TYPE_SLAVE && tty->link && tty->link->count) count++; - if (tty->count != count) { - tty_warn(tty, "%s: tty->count(%d) != #fd's(%d)\n", - routine, tty->count, count); - return count; + if (tty_port_kopened(tty->port)) + kopen_count++; + if (tty->count != (count + kopen_count)) { + tty_warn(tty, "%s: tty->count(%d) != (#fd's(%d) + #kopen's(%d))\n", + routine, tty->count, count, kopen_count); + return (count + kopen_count); } #endif return 0; @@ -1522,6 +1524,38 @@ static int tty_release_checks(struct tty_struct *tty, int idx) } /** + * tty_kclose - closes tty opened by tty_kopen + * @tty: tty device + * + * Performs the final steps to release and free a tty device. It is the + * same as tty_release_struct except that it also resets TTY_PORT_KOPENED + * flag on tty->port. + */ +void tty_kclose(struct tty_struct *tty) +{ + /* + * Ask the line discipline code to release its structures + */ + tty_ldisc_release(tty); + + /* Wait for pending work before tty destruction commmences */ + tty_flush_works(tty); + + tty_debug_hangup(tty, "freeing structure\n"); + /* + * The release_tty function takes care of the details of clearing + * the slots and preserving the termios structure. The tty_unlock_pair + * should be safe as we keep a kref while the tty is locked (so the + * unlock never unlocks a freed tty). + */ + mutex_lock(&tty_mutex); + tty_port_set_kopened(tty->port, 0); + release_tty(tty, tty->index); + mutex_unlock(&tty_mutex); +} +EXPORT_SYMBOL_GPL(tty_kclose); + +/** * tty_release_struct - release a tty struct * @tty: tty device * @idx: index of the tty @@ -1795,6 +1829,56 @@ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp, } /** + * tty_kopen - open a tty device for kernel + * @device: dev_t of device to open + * + * Opens tty exclusively for kernel. Performs the driver lookup, + * makes sure it's not already opened and performs the first-time + * tty initialization. + * + * Returns the locked initialized &tty_struct + * + * Claims the global tty_mutex to serialize: + * - concurrent first-time tty initialization + * - concurrent tty driver removal w/ lookup + * - concurrent tty removal from driver table + */ +struct tty_struct *tty_kopen(dev_t device) +{ + struct tty_struct *tty; + struct tty_driver *driver = NULL; + int index = -1; + + mutex_lock(&tty_mutex); + driver = tty_lookup_driver(device, NULL, &index); + if (IS_ERR(driver)) { + mutex_unlock(&tty_mutex); + return ERR_CAST(driver); + } + + /* check whether we're reopening an existing tty */ + tty = tty_driver_lookup_tty(driver, NULL, index); + if (IS_ERR(tty)) + goto out; + + if (tty) { + /* drop kref from tty_driver_lookup_tty() */ + tty_kref_put(tty); + tty = ERR_PTR(-EBUSY); + } else { /* tty_init_dev returns tty with the tty_lock held */ + tty = tty_init_dev(driver, index); + if (IS_ERR(tty)) + goto out; + tty_port_set_kopened(tty->port, 1); + } +out: + mutex_unlock(&tty_mutex); + tty_driver_kref_put(driver); + return tty; +} +EXPORT_SYMBOL_GPL(tty_kopen); + +/** * tty_open_by_driver - open a tty device * @device: dev_t of device to open * @inode: inode of device file @@ -1810,7 +1894,7 @@ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp, * - concurrent tty driver removal w/ lookup * - concurrent tty removal from driver table */ -struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode, +static struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode, struct file *filp) { struct tty_struct *tty; @@ -1833,6 +1917,12 @@ struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode, } if (tty) { + if (tty_port_kopened(tty->port)) { + tty_kref_put(tty); + mutex_unlock(&tty_mutex); + tty = ERR_PTR(-EBUSY); + goto out; + } mutex_unlock(&tty_mutex); retval = tty_lock_interruptible(tty); tty_kref_put(tty); /* drop kref from tty_driver_lookup_tty() */ @@ -1855,7 +1945,6 @@ out: tty_driver_kref_put(driver); return tty; } -EXPORT_SYMBOL_GPL(tty_open_by_driver); /** * tty_open - open a tty device |
