linux-kernel - [PATCH v4 17/24] n_tty: Don't wait for buffer work in read() loop

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Message-Id: <1371302076-4688-18-git-send-email-peter@hurleysoftware.com>
Date:	Sat, 15 Jun 2013 09:14:29 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v4 17/24] n_tty: Don't wait for buffer work in read() loop

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@...leysoftware.com>
---
 drivers/tty/n_tty.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index fe1c399..a6eea30 100644
--- 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;
-- 
1.8.1.2

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