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tty: n_hdlc: remove HDLC_MAGIC

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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/c31d228302da3f426cebf6fcff855181a5590a66.1663288066.git.nabijaczleweli@nabijaczleweli.xyz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
наб 2022-09-16 03:55:09 +02:00 committed by Greg Kroah-Hartman
parent 5052df99d3
commit 14f9ed6153
5 changed files with 0 additions and 31 deletions
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1
Documentation/process/magic-number.rst
View File

@ -71,7 +71,6 @@ Magic Name Number Structure File
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
HDLC_MAGIC 0x239e n_hdlc ``drivers/char/n_hdlc.c``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``

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

@ -77,7 +77,6 @@ Nome magico Numero Struttura File
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
HDLC_MAGIC 0x239e n_hdlc ``drivers/char/n_hdlc.c``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``

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

@ -60,7 +60,6 @@ Linux 魔术数
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
HDLC_MAGIC 0x239e n_hdlc ``drivers/char/n_hdlc.c``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``

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

@ -63,7 +63,6 @@ Linux 魔術數
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
HDLC_MAGIC 0x239e n_hdlc ``drivers/char/n_hdlc.c``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``

27
drivers/tty/n_hdlc.c
View File

@ -76,8 +76,6 @@
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define HDLC_MAGIC 0x239e
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
@ -123,7 +121,6 @@ struct n_hdlc_buf_list {
/**
* struct n_hdlc - per device instance data structure
* @magic: magic value for structure
* @tbusy: reentrancy flag for tx wakeup code
* @woke_up: tx wakeup needs to be run again as it was called while @tbusy
* @tx_buf_list: list of pending transmit frame buffers
@ -132,7 +129,6 @@ struct n_hdlc_buf_list {
* @rx_free_buf_list: list unused received frame buffers
*/
struct n_hdlc {
int magic;
bool tbusy;
bool woke_up;
struct n_hdlc_buf_list tx_buf_list;
@ -199,10 +195,6 @@ static void n_hdlc_tty_close(struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty->disc_data;
if (n_hdlc->magic != HDLC_MAGIC) {
pr_warn("n_hdlc: trying to close unopened tty!\n");
return;
}
#if defined(TTY_NO_WRITE_SPLIT)
clear_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
#endif
@ -385,12 +377,6 @@ static void n_hdlc_tty_receive(struct tty_struct *tty, const __u8 *data,
pr_debug("%s() called count=%d\n", __func__, count);
/* verify line is using HDLC discipline */
if (n_hdlc->magic != HDLC_MAGIC) {
pr_err("line not using HDLC discipline\n");
return;
}
if (count > maxframe) {
pr_debug("rx count>maxframesize, data discarded\n");
return;
@ -541,9 +527,6 @@ static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
pr_debug("%s() called count=%zd\n", __func__, count);
if (n_hdlc->magic != HDLC_MAGIC)
return -EIO;
/* verify frame size */
if (count > maxframe) {
pr_debug("%s: truncating user packet from %zu to %d\n",
@ -608,10 +591,6 @@ static int n_hdlc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
pr_debug("%s() called %d\n", __func__, cmd);
/* Verify the status of the device */
if (n_hdlc->magic != HDLC_MAGIC)
return -EBADF;
switch (cmd) {
case FIONREAD:
/* report count of read data available */
@ -672,9 +651,6 @@ static __poll_t n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
struct n_hdlc *n_hdlc = tty->disc_data;
__poll_t mask = 0;
if (n_hdlc->magic != HDLC_MAGIC)
return 0;
/*
* queue the current process into any wait queue that may awaken in the
* future (read and write)
@ -738,9 +714,6 @@ static struct n_hdlc *n_hdlc_alloc(void)
n_hdlc_alloc_buf(&n_hdlc->rx_free_buf_list, DEFAULT_RX_BUF_COUNT, "rx");
n_hdlc_alloc_buf(&n_hdlc->tx_free_buf_list, DEFAULT_TX_BUF_COUNT, "tx");
/* Initialize the control block */
n_hdlc->magic = HDLC_MAGIC;
return n_hdlc;
} /* end of n_hdlc_alloc() */