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Subject[PATCH v2 06/20] n_tty: Factor 'real raw' receive_buf into standalone fn
Date
Convert to modal receive_buf() processing; factor real_raw
receive_buf() into n_tty_receive_buf_real_raw().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/n_tty.c | 51 ++++++++++++++++++++++++++++++---------------------
1 file changed, 30 insertions(+), 21 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index f959dc9..309d964 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -242,7 +242,7 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
}

-static inline void n_tty_check_throttle(struct tty_struct *tty)
+static void n_tty_check_throttle(struct tty_struct *tty)
{
if (tty->driver->type == TTY_DRIVER_TYPE_PTY)
return;
@@ -1480,6 +1480,28 @@ handle_newline:
* publishes read_head and canon_head
*/

+static void
+n_tty_receive_buf_real_raw(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ size_t n, head;
+
+ head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
+ n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
+ n = min_t(size_t, count, n);
+ memcpy(read_buf_addr(ldata, head), cp, n);
+ ldata->read_head += n;
+ cp += n;
+ count -= n;
+
+ head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
+ n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
+ n = min_t(size_t, count, n);
+ memcpy(read_buf_addr(ldata, head), cp, n);
+ ldata->read_head += n;
+}
+
static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
char *fp, int count)
{
@@ -1487,23 +1509,9 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
char flags = TTY_NORMAL;
char buf[64];

- if (ldata->real_raw) {
- size_t n, head;
-
- head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
- n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
- n = min_t(size_t, count, n);
- memcpy(read_buf_addr(ldata, head), cp, n);
- ldata->read_head += n;
- cp += n;
- count -= n;
-
- head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
- n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
- n = min_t(size_t, count, n);
- memcpy(read_buf_addr(ldata, head), cp, n);
- ldata->read_head += n;
- } else {
+ if (ldata->real_raw)
+ n_tty_receive_buf_real_raw(tty, cp, fp, count);
+ else {
while (count--) {
if (fp)
flags = *fp++;
@@ -1539,8 +1547,6 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
}
-
- n_tty_check_throttle(tty);
}

static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
@@ -1548,6 +1554,7 @@ static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
{
down_read(&tty->termios_rwsem);
__receive_buf(tty, cp, fp, count);
+ n_tty_check_throttle(tty);
up_read(&tty->termios_rwsem);
}

@@ -1563,8 +1570,10 @@ static int n_tty_receive_buf2(struct tty_struct *tty, const unsigned char *cp,
if (!room)
ldata->no_room = 1;
count = min(count, room);
- if (count)
+ if (count) {
__receive_buf(tty, cp, fp, count);
+ n_tty_check_throttle(tty);
+ }

up_read(&tty->termios_rwsem);

--
1.8.1.2


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