TTY: move allocations to tty_alloc_driver

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>

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 098a7c7..a67609b 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -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);