linux-kernel - [PATCH v2 10/14] tty: n_tty: simplify chars_in

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Message-ID: <20230827074147.2287-11-jirislaby@kernel.org>
Date:   Sun, 27 Aug 2023 09:41:43 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH v2 10/14] tty: n_tty: simplify chars_in_buffer()

The 'if' in chars_in_buffer() is misleadingly inverted. And since the
only difference is the head used for computation, cache the head using
ternary operator. And use that in return directly.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/n_tty.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 369f5dd9cc4b..e722065b2db4 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -219,13 +219,9 @@ static void n_tty_kick_worker(const struct tty_struct *tty)
 static ssize_t chars_in_buffer(const struct tty_struct *tty)
 {
 	const struct n_tty_data *ldata = tty->disc_data;
-	ssize_t n = 0;
+	size_t head = ldata->icanon ? ldata->canon_head : ldata->commit_head;
 
-	if (!ldata->icanon)
-		n = ldata->commit_head - ldata->read_tail;
-	else
-		n = ldata->canon_head - ldata->read_tail;
-	return n;
+	return head - ldata->read_tail;
 }
 
 /**
-- 
2.42.0