tty: make counts in tty_port_client_operations hooks size_t

The counts in tty_port_client_operations hooks' are currently
represented by all 'int', 'unsigned int', and 'size_t'. Unify them all
to unsigned 'size_t' for clarity. Note that size_t is used already in
tty_buffer.c. So, eventually, it is spread for counts everywhere and
this is the beginning.

So the two changes namely:
* ::receive_buf() is called from tty_ldisc_receive_buf(). And that
  expects values ">= 0" from ::receive_buf(), so switch its rettype to
  size_t is fine. tty_ldisc_receive_buf() types will be changed
  separately.
* ::lookahead_buf()'s count comes from lookahead_bufs() and is already
  'unsigned int'.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230810091510.13006-11-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/tty_port.h b/include/linux/tty_port.h
index 726575743367..6b367eb17979 100644
--- a/include/linux/tty_port.h
+++ b/include/linux/tty_port.h
@@ -39,10 +39,10 @@ struct tty_port_operations {
 };
 
 struct tty_port_client_operations {
-	int (*receive_buf)(struct tty_port *port, const u8 *cp, const u8 *fp,
-			   size_t count);
+	size_t (*receive_buf)(struct tty_port *port, const u8 *cp, const u8 *fp,
+			      size_t count);
 	void (*lookahead_buf)(struct tty_port *port, const u8 *cp,
-			      const u8 *fp, unsigned int count);
+			      const u8 *fp, size_t count);
 	void (*write_wakeup)(struct tty_port *port);
 };