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tty: remove TTY_MAGIC 

According to Greg, in the context of magic numbers as defined in
magic-number.rst, "the tty layer should not need this and I'll gladly
take patches"

Acked-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Ref: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@kroah.com/
Link: https://lore.kernel.org/r/476d024cd6b04160a5de381ea2b9856b60088cbd.1663288066.git.nabijaczleweli@nabijaczleweli.xyz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
наб 2022-09-16 03:54:59 +02:00 committed by Greg Kroah-Hartman
parent 1d5859ef22
commit 7a4e0d2c7f
7 changed files with 0 additions and 24 deletions
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1
Documentation/process/magic-number.rst
View File

@ -84,7 +84,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``

1
Documentation/translations/it_IT/process/magic-number.rst
View File

@ -90,7 +90,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``

1
Documentation/translations/zh_CN/process/magic-number.rst
View File

@ -73,7 +73,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``

1
Documentation/translations/zh_TW/process/magic-number.rst
View File

@ -76,7 +76,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``

8
drivers/tty/tty_io.c
View File

@ -170,7 +170,6 @@ static void free_tty_struct(struct tty_struct *tty)
tty_ldisc_deinit(tty);
put_device(tty->dev);
kvfree(tty->write_buf);
tty->magic = 0xDEADDEAD;
kfree(tty);
}
@ -265,11 +264,6 @@ static int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
imajor(inode), iminor(inode), routine);
return 1;
}
if (tty->magic != TTY_MAGIC) {
pr_warn("(%d:%d): %s: bad magic number\n",
imajor(inode), iminor(inode), routine);
return 1;
}
#endif
return 0;
}
@ -1533,7 +1527,6 @@ static void release_one_tty(struct work_struct *work)
if (tty->ops->cleanup)
tty->ops->cleanup(tty);
tty->magic = 0;
tty_driver_kref_put(driver);
module_put(owner);
@ -3093,7 +3086,6 @@ struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx)
return NULL;
kref_init(&tty->kref);
tty->magic = TTY_MAGIC;
if (tty_ldisc_init(tty)) {
kfree(tty);
return NULL;

6
drivers/tty/tty_mutex.c
View File

@ -14,8 +14,6 @@
void tty_lock(struct tty_struct *tty)
{
if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
return;
tty_kref_get(tty);
mutex_lock(&tty->legacy_mutex);
}
@ -25,8 +23,6 @@ int tty_lock_interruptible(struct tty_struct *tty)
{
int ret;
if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
return -EIO;
tty_kref_get(tty);
ret = mutex_lock_interruptible(&tty->legacy_mutex);
if (ret)
@ -36,8 +32,6 @@ int tty_lock_interruptible(struct tty_struct *tty)
void tty_unlock(struct tty_struct *tty)
{
if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
return;
mutex_unlock(&tty->legacy_mutex);
tty_kref_put(tty);
}

6
include/linux/tty.h
View File

@ -122,8 +122,6 @@ struct tty_operations;
/**
* struct tty_struct - state associated with a tty while open
*
* @magic: magic value set early in @alloc_tty_struct to %TTY_MAGIC, for
* debugging purposes
* @kref: reference counting by tty_kref_get() and tty_kref_put(), reaching zero
* frees the structure
* @dev: class device or %NULL (e.g. ptys, serdev)
@ -193,7 +191,6 @@ struct tty_operations;
* &struct tty_port.
*/
struct tty_struct {
int magic;
struct kref kref;
struct device *dev;
struct tty_driver *driver;
@ -260,9 +257,6 @@ struct tty_file_private {
struct list_head list;
};
/* tty magic number */
#define TTY_MAGIC 0x5401
/**
* DOC: TTY Struct Flags
*