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Subject[PATCH v3 4/9] n_tty: Factor ISTRIP and IUCLC receive_buf into separate fn
Date
Convert to modal receive_buf processing; factor char receive
processing for unusual termios settings out of normal per-char
i/o path.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/n_tty.c | 44 ++++++++++++++++++++++++++++++++------------
1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 140b555..99bbee4 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1417,16 +1417,6 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
struct n_tty_data *ldata = tty->disc_data;
int parmrk;

- if (I_ISTRIP(tty))
- c &= 0x7f;
- if (I_IUCLC(tty) && L_IEXTEN(tty))
- c = tolower(c);
-
- if (L_EXTPROC(tty)) {
- put_tty_queue(c, ldata);
- return;
- }
-
/*
* If the previous character was LNEXT, or we know that this
* character is not one of the characters that we'll have to
@@ -1584,7 +1574,34 @@ n_tty_receive_buf_closing(struct tty_struct *tty, const unsigned char *cp,

static void
n_tty_receive_buf_standard(struct tty_struct *tty, const unsigned char *cp,
- char *fp, int count)
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ char flag = TTY_NORMAL;
+
+ while (count--) {
+ if (fp)
+ flag = *fp++;
+ if (likely(flag == TTY_NORMAL)) {
+ unsigned char c = *cp++;
+
+ if (I_ISTRIP(tty))
+ c &= 0x7f;
+ if (I_IUCLC(tty) && L_IEXTEN(tty))
+ c = tolower(c);
+ if (L_EXTPROC(tty)) {
+ put_tty_queue(c, ldata);
+ continue;
+ }
+ n_tty_receive_char(tty, c);
+ } else
+ n_tty_receive_char_flagged(tty, *cp++, flag);
+ }
+}
+
+static void
+n_tty_receive_buf_fast(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
{
char flag = TTY_NORMAL;

@@ -1611,7 +1628,10 @@ 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 {
- n_tty_receive_buf_standard(tty, cp, fp, count);
+ if (!preops)
+ n_tty_receive_buf_fast(tty, cp, fp, count);
+ else
+ n_tty_receive_buf_standard(tty, cp, fp, count);

flush_echoes(tty);
if (tty->ops->flush_chars)
--
1.8.1.2


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