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n_hdlc: invert conditions in n_hdlc_tty_close and n_hdlc_tty_poll

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This makes the functions return immediatelly on invalid state. And we
can push the indent of the later code one level left.

Pass "-w" to "git show" to see we are changing only the conditions (and
whitespace).

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200219084118.26491-8-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2020-02-19 09:41:02 +01:00 committed by Greg Kroah-Hartman
parent 30fafd92c2
commit 5f2895143d
1 changed files with 36 additions and 32 deletions
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68
drivers/tty/n_hdlc.c
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@ -258,24 +258,25 @@ static void n_hdlc_tty_close(struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
if (n_hdlc != NULL) {
if (n_hdlc->magic != HDLC_MAGIC) {
printk (KERN_WARNING"n_hdlc: trying to close unopened tty!\n");
return;
}
if (!n_hdlc)
return;
if (n_hdlc->magic != HDLC_MAGIC) {
printk(KERN_WARNING "n_hdlc: trying to close unopened tty!\n");
return;
}
#if defined(TTY_NO_WRITE_SPLIT)
clear_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
clear_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
#endif
tty->disc_data = NULL;
if (tty == n_hdlc->backup_tty)
n_hdlc->backup_tty = NULL;
if (tty != n_hdlc->tty)
return;
if (n_hdlc->backup_tty) {
n_hdlc->tty = n_hdlc->backup_tty;
} else {
n_hdlc_release (n_hdlc);
}
tty->disc_data = NULL;
if (tty == n_hdlc->backup_tty)
n_hdlc->backup_tty = NULL;
if (tty != n_hdlc->tty)
return;
if (n_hdlc->backup_tty) {
n_hdlc->tty = n_hdlc->backup_tty;
} else {
n_hdlc_release (n_hdlc);
}
} /* end of n_hdlc_tty_close() */
@ -737,24 +738,27 @@ static __poll_t n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
__poll_t mask = 0;
if (n_hdlc && n_hdlc->magic == HDLC_MAGIC && tty == n_hdlc->tty) {
/* queue current process into any wait queue that */
/* may awaken in the future (read and write) */
if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC || tty != n_hdlc->tty)
return 0;
poll_wait(filp, &tty->read_wait, wait);
poll_wait(filp, &tty->write_wait, wait);
/*
* queue the current process into any wait queue that may awaken in the
* future (read and write)
*/
poll_wait(filp, &tty->read_wait, wait);
poll_wait(filp, &tty->write_wait, wait);
/* set bits for operations that won't block */
if (!list_empty(&n_hdlc->rx_buf_list.list))
mask |= EPOLLIN | EPOLLRDNORM; /* readable */
if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
mask |= EPOLLHUP;
if (tty_hung_up_p(filp))
mask |= EPOLLHUP;
if (!tty_is_writelocked(tty) &&
!list_empty(&n_hdlc->tx_free_buf_list.list))
mask |= EPOLLOUT | EPOLLWRNORM; /* writable */
/* set bits for operations that won't block */
if (!list_empty(&n_hdlc->rx_buf_list.list))
mask |= EPOLLIN | EPOLLRDNORM; /* readable */
if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
mask |= EPOLLHUP;
if (tty_hung_up_p(filp))
mask |= EPOLLHUP;
if (!tty_is_writelocked(tty) &&
!list_empty(&n_hdlc->tx_free_buf_list.list))
mask |= EPOLLOUT | EPOLLWRNORM; /* writable */
}
return mask;
} /* end of n_hdlc_tty_poll() */