Signed-off-by: Peter Hurley <pe...@hurleysoftware.com>
---
drivers/tty/n_tty.c | 31 +++++++++++++++++--------------
1 file changed, 17 insertions(+), 14 deletions(-)
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 9d7badc..68445c7 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1471,26 +1471,29 @@ static void n_tty_receive_buf(struct tty_struct *tty,
const unsigned char *cp,
struct n_tty_data *ldata = tty->disc_data;
const unsigned char *p;
char *f, flags = TTY_NORMAL;
- int i;
char buf[64];
down_read(&tty->termios_rwsem);
if (ldata->real_raw) {
- i = min(N_TTY_BUF_SIZE - read_cnt(ldata),
- N_TTY_BUF_SIZE - (ldata->read_head & (N_TTY_BUF_SIZE -
1)));
- i = min(count, i);
- memcpy(read_buf_addr(ldata, ldata->read_head), cp, i);
- ldata->read_head += i;
- cp += i;
- count -= i;
-
- i = min(N_TTY_BUF_SIZE - read_cnt(ldata),
- N_TTY_BUF_SIZE - (ldata->read_head & (N_TTY_BUF_SIZE -
1)));
- i = min(count, i);
- memcpy(read_buf_addr(ldata, ldata->read_head), cp, i);
- ldata->read_head += i;
+ 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 {
+ int i;
+
for (i = count, p = cp, f = fp; i; i--, p++) {
if (f)
flags = *f++;
--
1.8.1.2
--
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