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n_tty: move lnext handling

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Move lnext handling from __receive_buf to n_tty_receive_buf_standard. It
simplifies the handling as it needs not fetching 'flag' and decrement
'count' in __receive_buf. Instead, all this is left up to the loop in
n_tty_receive_buf_standard which already does that.

This way, no need to repeat the action when n_tty_receive_char_special
returns true -- ldata->lnext is set there in that case, so the 'if
(ldata->lnext)' check is sufficient. The next patch will switch
n_tty_receive_char_special to return 'void'.

The result is much simplified code flow.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210505091928.22010-7-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-05-05 11:18:59 +02:00 • committed by Greg Kroah-Hartman
parent 95aafe3278
commit 67a620d58b
1 changed files with 8 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

23
drivers/tty/n_tty.c
View file

@ -1538,6 +1538,12 @@ static void n_tty_receive_buf_standard(struct tty_struct *tty,
while (count--) {
if (fp)
flag = *fp++;
if (ldata->lnext) {
n_tty_receive_char_lnext(tty, *cp++, flag);
continue;
}
if (likely(flag == TTY_NORMAL)) {
unsigned char c = *cp++;
@ -1551,12 +1557,8 @@ static void n_tty_receive_buf_standard(struct tty_struct *tty,
}
if (!test_bit(c, ldata->char_map))
n_tty_receive_char(tty, c);
else if (n_tty_receive_char_special(tty, c) && count) {
if (fp)
flag = *fp++;
n_tty_receive_char_lnext(tty, *cp++, flag);
count--;
}
else
n_tty_receive_char_special(tty, c);
} else
n_tty_receive_char_flagged(tty, *cp++, flag);
}
@ -1575,15 +1577,6 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
else if (tty->closing && !L_EXTPROC(tty))
n_tty_receive_buf_closing(tty, cp, fp, count);
else {
if (ldata->lnext) {
char flag = TTY_NORMAL;
if (fp)
flag = *fp++;
n_tty_receive_char_lnext(tty, *cp++, flag);
count--;
}
n_tty_receive_buf_standard(tty, cp, fp, count);
flush_echoes(tty);