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tty: add tty_struct->dev pointer to corresponding device instance 

Some device drivers (mostly tty line disciplines) would like to have way
know a struct device instance corresponding to passed tty_struct. Add
a struct device pointer to struct tty_struct and populate it during
initialize_tty_struct().

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dmitry Eremin-Solenikov 2010-08-09 18:22:49 +04:00 committed by Greg Kroah-Hartman
parent f6f94e2ab1
commit 30004ac9c0
2 changed files with 18 additions and 0 deletions
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17
drivers/char/tty_io.c
View File

@ -183,6 +183,8 @@ struct tty_struct *alloc_tty_struct(void)
void free_tty_struct(struct tty_struct *tty)
{
if (tty->dev)
put_device(tty->dev);
kfree(tty->write_buf);
tty_buffer_free_all(tty);
kfree(tty);
@ -2783,6 +2785,20 @@ void do_SAK(struct tty_struct *tty)
EXPORT_SYMBOL(do_SAK);
static int dev_match_devt(struct device *dev, void *data)
{
dev_t *devt = data;
return dev->devt == *devt;
}
/* Must put_device() after it's unused! */
static struct device *tty_get_device(struct tty_struct *tty)
{
dev_t devt = tty_devnum(tty);
return class_find_device(tty_class, NULL, &devt, dev_match_devt);
}
/**
* initialize_tty_struct
* @tty: tty to initialize
@ -2823,6 +2839,7 @@ void initialize_tty_struct(struct tty_struct *tty,
tty->ops = driver->ops;
tty->index = idx;
tty_line_name(driver, idx, tty->name);
tty->dev = tty_get_device(tty);
}
/**

1
include/linux/tty.h
View File

@ -256,6 +256,7 @@ struct tty_operations;
struct tty_struct {
int magic;
struct kref kref;
struct device *dev;
struct tty_driver *driver;
const struct tty_operations *ops;
int index;