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drivers: tty: Merge alloc_tty_struct and initialize_tty_struct

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The two functions alloc_tty_struct and initialize_tty_struct are
always called together. Merge them into alloc_tty_struct, updating its
prototype and the only two callers of these functions.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rasmus Villemoes 2014-07-10 21:01:22 +02:00 committed by Greg Kroah-Hartman
parent 493671a2ce
commit 2c964a2f41
3 changed files with 23 additions and 37 deletions
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19
drivers/tty/pty.c
View file

@ -316,7 +316,7 @@ static int pty_resize(struct tty_struct *tty, struct winsize *ws)
* pty_common_install - set up the pty pair
* @driver: the pty driver
* @tty: the tty being instantiated
* @bool: legacy, true if this is BSD style
* @legacy: true if this is BSD style
*
* Perform the initial set up for the tty/pty pair. Called from the
* tty layer when the port is first opened.
@ -331,18 +331,17 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
int idx = tty->index;
int retval = -ENOMEM;
o_tty = alloc_tty_struct();
if (!o_tty)
goto err;
ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
if (!ports[0] || !ports[1])
goto err_free_tty;
goto err;
if (!try_module_get(driver->other->owner)) {
/* This cannot in fact currently happen */
goto err_free_tty;
goto err;
}
initialize_tty_struct(o_tty, driver->other, idx);
o_tty = alloc_tty_struct(driver->other, idx);
if (!o_tty)
goto err_put_module;
if (legacy) {
/* We always use new tty termios data so we can do this
@ -387,12 +386,12 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
tty_free_termios(tty);
err_deinit_tty:
deinitialize_tty_struct(o_tty);
free_tty_struct(o_tty);
err_put_module:
module_put(o_tty->driver->owner);
err_free_tty:
err:
kfree(ports[0]);
kfree(ports[1]);
free_tty_struct(o_tty);
err:
return retval;
}

37
drivers/tty/tty_io.c
View file

@ -156,20 +156,6 @@ static void release_tty(struct tty_struct *tty, int idx);
static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
/**
* alloc_tty_struct - allocate a tty object
*
* Return a new empty tty structure. The data fields have not
* been initialized in any way but has been zeroed
*
* Locking: none
*/
struct tty_struct *alloc_tty_struct(void)
{
return kzalloc(sizeof(struct tty_struct), GFP_KERNEL);
}
/**
* free_tty_struct - free a disused tty
* @tty: tty struct to free
@ -1455,12 +1441,11 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
if (!try_module_get(driver->owner))
return ERR_PTR(-ENODEV);
tty = alloc_tty_struct();
tty = alloc_tty_struct(driver, idx);
if (!tty) {
retval = -ENOMEM;
goto err_module_put;
}
initialize_tty_struct(tty, driver, idx);
tty_lock(tty);
retval = tty_driver_install_tty(driver, tty);
@ -3003,19 +2988,21 @@ static struct device *tty_get_device(struct tty_struct *tty)
/**
* initialize_tty_struct
* @tty: tty to initialize
* alloc_tty_struct
*
* This subroutine initializes a tty structure that has been newly
* allocated.
* This subroutine allocates and initializes a tty structure.
*
* Locking: none - tty in question must not be exposed at this point
* Locking: none - tty in question is not exposed at this point
*/
void initialize_tty_struct(struct tty_struct *tty,
struct tty_driver *driver, int idx)
struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx)
{
memset(tty, 0, sizeof(struct tty_struct));
struct tty_struct *tty;
tty = kzalloc(sizeof(*tty), GFP_KERNEL);
if (!tty)
return NULL;
kref_init(&tty->kref);
tty->magic = TTY_MAGIC;
tty_ldisc_init(tty);
@ -3039,6 +3026,8 @@ void initialize_tty_struct(struct tty_struct *tty,
tty->index = idx;
tty_line_name(driver, idx, tty->name);
tty->dev = tty_get_device(tty);
return tty;
}
/**

4
include/linux/tty.h
View file

@ -477,13 +477,11 @@ extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
extern void tty_default_fops(struct file_operations *fops);
extern struct tty_struct *alloc_tty_struct(void);
extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
extern int tty_alloc_file(struct file *file);
extern void tty_add_file(struct tty_struct *tty, struct file *file);
extern void tty_free_file(struct file *file);
extern void free_tty_struct(struct tty_struct *tty);
extern void initialize_tty_struct(struct tty_struct *tty,
struct tty_driver *driver, int idx);
extern void deinitialize_tty_struct(struct tty_struct *tty);
extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
extern int tty_release(struct inode *inode, struct file *filp);