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TTY: move allocations to tty_alloc_driver

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So now, that we have flags and know everything needed, keep a promise
and move all the tables and ports allocation from tty_register_driver
to tty_alloc_driver.

Not only that it makes sense, but we need this for
tty_port_link_device which needs tty_driver->ports but is to be called
before tty_register_driver.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-08-08 22:26:42 +02:00 committed by Greg Kroah-Hartman
parent 21aca2fa00
commit 16a02081ba
1 changed files with 33 additions and 40 deletions
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73
drivers/tty/tty_io.c
View File

@ -3074,6 +3074,7 @@ struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner,
unsigned long flags)
{
struct tty_driver *driver;
int err;
if (!lines)
return ERR_PTR(-EINVAL);
@ -3087,9 +3088,34 @@ struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner,
driver->num = lines;
driver->owner = owner;
driver->flags = flags;
/* later we'll move allocation of tables here */
if (!(flags & TTY_DRIVER_DEVPTS_MEM)) {
driver->ttys = kcalloc(lines, sizeof(*driver->ttys),
GFP_KERNEL);
driver->termios = kcalloc(lines, sizeof(*driver->termios),
GFP_KERNEL);
if (!driver->ttys || !driver->termios) {
err = -ENOMEM;
goto err_free_all;
}
}
if (!(flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
driver->ports = kcalloc(lines, sizeof(*driver->ports),
GFP_KERNEL);
if (!driver->ports) {
err = -ENOMEM;
goto err_free_all;
}
}
return driver;
err_free_all:
kfree(driver->ports);
kfree(driver->ttys);
kfree(driver->termios);
kfree(driver);
return ERR_PTR(err);
}
EXPORT_SYMBOL(__tty_alloc_driver);
@ -3098,7 +3124,6 @@ static void destruct_tty_driver(struct kref *kref)
struct tty_driver *driver = container_of(kref, struct tty_driver, kref);
int i;
struct ktermios *tp;
void *p;
if (driver->flags & TTY_DRIVER_INSTALLED) {
/*
@ -3115,14 +3140,12 @@ static void destruct_tty_driver(struct kref *kref)
if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV))
tty_unregister_device(driver, i);
}
p = driver->ttys;
proc_tty_unregister_driver(driver);
driver->ttys = NULL;
driver->termios = NULL;
kfree(p);
cdev_del(&driver->cdev);
}
kfree(driver->ports);
kfree(driver->termios);
kfree(driver->ttys);
kfree(driver);
}
@ -3153,27 +3176,8 @@ int tty_register_driver(struct tty_driver *driver)
int error;
int i;
dev_t dev;
void **p = NULL;
struct device *d;
if (!(driver->flags & TTY_DRIVER_DEVPTS_MEM) && driver->num) {
p = kzalloc(driver->num * 2 * sizeof(void *), GFP_KERNEL);
if (!p)
return -ENOMEM;
}
/*
* There is too many lines in PTY and we won't need the array there
* since it has an ->install hook where it assigns ports properly.
*/
if (driver->type != TTY_DRIVER_TYPE_PTY) {
driver->ports = kcalloc(driver->num, sizeof(struct tty_port *),
GFP_KERNEL);
if (!driver->ports) {
error = -ENOMEM;
goto err_free_p;
}
}
if (!driver->major) {
error = alloc_chrdev_region(&dev, driver->minor_start,
driver->num, driver->name);
@ -3186,15 +3190,7 @@ int tty_register_driver(struct tty_driver *driver)
error = register_chrdev_region(dev, driver->num, driver->name);
}
if (error < 0)
goto err_free_p;
if (p) {
driver->ttys = (struct tty_struct **)p;
driver->termios = (struct ktermios **)(p + driver->num);
} else {
driver->ttys = NULL;
driver->termios = NULL;
}
goto err;
cdev_init(&driver->cdev, &tty_fops);
driver->cdev.owner = driver->owner;
@ -3211,7 +3207,7 @@ int tty_register_driver(struct tty_driver *driver)
d = tty_register_device(driver, i, NULL);
if (IS_ERR(d)) {
error = PTR_ERR(d);
goto err;
goto err_unreg_devs;
}
}
}
@ -3219,7 +3215,7 @@ int tty_register_driver(struct tty_driver *driver)
driver->flags |= TTY_DRIVER_INSTALLED;
return 0;
err:
err_unreg_devs:
for (i--; i >= 0; i--)
tty_unregister_device(driver, i);
@ -3229,10 +3225,7 @@ err:
err_unreg_char:
unregister_chrdev_region(dev, driver->num);
driver->ttys = NULL;
driver->termios = NULL;
err_free_p: /* destruct_tty_driver will free driver->ports */
kfree(p);
err:
return error;
}
EXPORT_SYMBOL(tty_register_driver);