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Subject[PATCH 19/41] TTY: move allocations to tty_alloc_driver
Date
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>
---
drivers/tty/tty_io.c | 73 +++++++++++++++++++++++---------------------------
1 file changed, 33 insertions(+), 40 deletions(-)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index e024521..8181cb5 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3059,6 +3059,7 @@ 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);
@@ -3072,9 +3073,34 @@ 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_EXCESSIVE_LINES)) {
+ 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);

@@ -3083,7 +3109,6 @@ 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) {
/*
@@ -3100,14 +3125,12 @@ 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);
}

@@ -3138,27 +3161,8 @@ 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);
@@ -3171,15 +3175,7 @@ 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;
@@ -3196,7 +3192,7 @@ 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;
}
}
}
@@ -3204,7 +3200,7 @@ 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);

@@ -3214,10 +3210,7 @@ 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);
--
1.7.10.4



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