tty: make tty_ldisc_ops::*buf*() hooks operate on size_t

Count passed to tty_ldisc_ops::receive_buf*(), ::lookahead_buf(), and
returned from ::receive_buf2() is expected to be size_t. So set it to
size_t to unify with the rest of the code.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: William Hubbs <w.d.hubbs@gmail.com>
Cc: Chris Brannon <chris@the-brannons.com>
Cc: Kirk Reiser <kirk@reisers.ca>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Max Staudt <max@enpas.org>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Cc: Andreas Koensgen <ajk@comnets.uni-bremen.de>
Cc: Jeremy Kerr <jk@codeconstruct.com.au>
Cc: Matt Johnston <matt@codeconstruct.com.au>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230810091510.13006-16-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 11 insertions, 9 deletions

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index c7a787f10a9c..2f85877b8ba1 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3490,7 +3490,7 @@ static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
 }
 
 static void gsmld_receive_buf(struct tty_struct *tty, const unsigned char *cp,
-			      const char *fp, int count)
+			      const char *fp, size_t count)
 {
 	struct gsm_mux *gsm = tty->disc_data;
 	char flags = TTY_NORMAL;
diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
index 46b09bfb6f3a..ce3c779f5c03 100644
--- a/drivers/tty/n_hdlc.c
+++ b/drivers/tty/n_hdlc.c
@@ -370,12 +370,12 @@ static void n_hdlc_tty_wakeup(struct tty_struct *tty)
  * interpreted as one HDLC frame.
  */
 static void n_hdlc_tty_receive(struct tty_struct *tty, const __u8 *data,
-			       const char *flags, int count)
+			       const char *flags, size_t count)
 {
 	register struct n_hdlc *n_hdlc = tty->disc_data;
 	register struct n_hdlc_buf *buf;
 
-	pr_debug("%s() called count=%d\n", __func__, count);
+	pr_debug("%s() called count=%zu\n", __func__, count);
 
 	if (count > maxframe) {
 		pr_debug("rx count>maxframesize, data discarded\n");
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 0043cc84b91a..ee9b20dcbce6 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1480,7 +1480,7 @@ n_tty_receive_char_lnext(struct tty_struct *tty, unsigned char c, char flag)
 
 /* Caller must ensure count > 0 */
 static void n_tty_lookahead_flow_ctrl(struct tty_struct *tty, const unsigned char *cp,
-				      const unsigned char *fp, unsigned int count)
+				      const unsigned char *fp, size_t count)
 {
 	struct n_tty_data *ldata = tty->disc_data;
 	unsigned char flag = TTY_NORMAL;
@@ -1662,12 +1662,13 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
  *	claims non-exclusive %termios_rwsem
  *	publishes commit_head or canon_head
  */
-static int
+static size_t
 n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 			 const char *fp, int count, int flow)
 {
 	struct n_tty_data *ldata = tty->disc_data;
-	int room, n, rcvd = 0, overflow;
+	size_t rcvd = 0;
+	int room, n, overflow;
 
 	down_read(&tty->termios_rwsem);
 
@@ -1744,13 +1745,14 @@ n_tty_receive_buf_common(struct tty_struct *tty, const unsigned char *cp,
 }
 
 static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
-			      const char *fp, int count)
+			      const char *fp, size_t count)
 {
 	n_tty_receive_buf_common(tty, cp, fp, count, 0);
 }
 
-static int n_tty_receive_buf2(struct tty_struct *tty, const unsigned char *cp,
-			      const char *fp, int count)
+static size_t n_tty_receive_buf2(struct tty_struct *tty,
+				 const unsigned char *cp, const char *fp,
+				 size_t count)
 {
 	return n_tty_receive_buf_common(tty, cp, fp, count, 1);
 }