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n_tty: Don't wait for buffer work in read() loop
author
Peter Hurley
<peter@hurleysoftware.com>
Sat, 15 Jun 2013 13:14:29 +0000
(09:14 -0400)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Tue, 23 Jul 2013 23:43:02 +0000
(16:43 -0700)
User-space read() can run concurrently with receiving from device;
waiting for receive_buf() to complete is not required.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/n_tty.c
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diff --git
a/drivers/tty/n_tty.c
b/drivers/tty/n_tty.c
index
fe1c399
..
a6eea30
100644
(file)
--- a/
drivers/tty/n_tty.c
+++ b/
drivers/tty/n_tty.c
@@
-1724,7
+1724,6
@@
static inline int input_available_p(struct tty_struct *tty, int amt)
{
struct n_tty_data *ldata = tty->disc_data;
- tty_flush_to_ldisc(tty);
if (ldata->icanon && !L_EXTPROC(tty)) {
if (ldata->canon_head != ldata->read_tail)
return 1;