From: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Date: Sun, 27 Aug 2023 07:41:47 +0000 (+0200)
Subject: tty: n_tty: deduplicate copy code in n_tty_receive_buf_real_raw()
X-Git-Tag: v6.6-rc1~101^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a84853c5954fe2c1b97db2f005ae156dc29ae233;p=thirdparty%2Flinux.git

tty: n_tty: deduplicate copy code in n_tty_receive_buf_real_raw()

The code is duplicated to perform the copy twice -- to handle buffer
wrap-around. Instead of the duplication, roll this into the loop.

(And add some blank lines around to have the code a bit more readable.)

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230827074147.2287-15-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index edf59f6fc6695..6c9a408d67cd6 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1528,19 +1528,18 @@ n_tty_receive_buf_real_raw(const struct tty_struct *tty, const u8 *cp,
 			   size_t count)
 {
 	struct n_tty_data *ldata = tty->disc_data;
-	size_t n, head;
-
-	head = MASK(ldata->read_head);
-	n = min(count, N_TTY_BUF_SIZE - head);
-	memcpy(read_buf_addr(ldata, head), cp, n);
-	ldata->read_head += n;
-	cp += n;
-	count -= n;
-
-	head = MASK(ldata->read_head);
-	n = min(count, N_TTY_BUF_SIZE - head);
-	memcpy(read_buf_addr(ldata, head), cp, n);
-	ldata->read_head += n;
+
+	/* handle buffer wrap-around by a loop */
+	for (unsigned int i = 0; i < 2; i++) {
+		size_t head = MASK(ldata->read_head);
+		size_t n = min(count, N_TTY_BUF_SIZE - head);
+
+		memcpy(read_buf_addr(ldata, head), cp, n);
+
+		ldata->read_head += n;
+		cp += n;
+		count -= n;
+	}
 }
 
 static void