linux-kernel - [PATCH 23/36] tty: use min() in iterate_tty

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Date:   Thu, 10 Aug 2023 11:14:57 +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 23/36] tty: use min() in iterate_tty_write()

It simplifies the code. The "price" is we have to unify 'chunk' to be
size_t the same as 'count' is. But that change is actually correct.

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

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 846460c02c58..0cf1277e260b 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -964,9 +964,8 @@ int tty_write_lock(struct tty_struct *tty, bool ndelay)
 static ssize_t iterate_tty_write(struct tty_ldisc *ld, struct tty_struct *tty,
 				 struct file *file, struct iov_iter *from)
 {
-	size_t count = iov_iter_count(from);
+	size_t chunk, count = iov_iter_count(from);
 	ssize_t ret, written = 0;
-	unsigned int chunk;
 
 	ret = tty_write_lock(tty, file->f_flags & O_NDELAY);
 	if (ret < 0)
@@ -1010,10 +1009,7 @@ static ssize_t iterate_tty_write(struct tty_ldisc *ld, struct tty_struct *tty,
 
 	/* Do the write .. */
 	for (;;) {
-		size_t size = count;
-
-		if (size > chunk)
-			size = chunk;
+		size_t size = min(chunk, count);
 
 		ret = -EFAULT;
 		if (copy_from_iter(tty->write_buf, size, from) != size)
-- 
2.41.0