linux-kernel - [PATCH] staging: gdm724x: gdm_tty: replaced macro with a function

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Message-Id: <20200901201626.75405-1-antoni.przybylik@wp.pl>
Date:   Tue,  1 Sep 2020 22:16:26 +0200
From:   Antoni Przybylik <antoni.przybylik@...pl>
To:     gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Antoni Przybylik <antoni.przybylik@...pl>
Subject: [PATCH] staging: gdm724x: gdm_tty: replaced macro with a function

This approach is more elegant and prevents some problems related to
macros such as operator precedence in expanded expression.

Signed-off-by: Antoni Przybylik <antoni.przybylik@...pl>
---
 drivers/staging/gdm724x/gdm_tty.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 6e813693a766..c19d82a6f25e 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -27,8 +27,6 @@
 
 #define MUX_TX_MAX_SIZE 2048
 
-#define GDM_TTY_READY(gdm) (gdm && gdm->tty_dev && gdm->port.count)
-
 static struct tty_driver *gdm_driver[TTY_MAX_COUNT];
 static struct gdm *gdm_table[TTY_MAX_COUNT][GDM_TTY_MINOR];
 static DEFINE_MUTEX(gdm_table_lock);
@@ -36,6 +34,11 @@ static DEFINE_MUTEX(gdm_table_lock);
 static const char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
 static char *DEVICE_STRING[TTY_MAX_COUNT] = {"GCT-ATC", "GCT-DM"};
 
+static int gdm_tty_ready(struct gdm *gdm)
+{
+	return (gdm && gdm->tty_dev && gdm->port.count);
+}
+
 static void gdm_port_destruct(struct tty_port *port)
 {
 	struct gdm *gdm = container_of(port, struct gdm, port);
@@ -119,7 +122,7 @@ static int gdm_tty_recv_complete(void *data,
 {
 	struct gdm *gdm = tty_dev->gdm[index];
 
-	if (!GDM_TTY_READY(gdm)) {
+	if (!gdm_tty_ready(gdm)) {
 		if (complete == RECV_PACKET_PROCESS_COMPLETE)
 			gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
 						gdm_tty_recv_complete);
@@ -146,7 +149,7 @@ static void gdm_tty_send_complete(void *arg)
 {
 	struct gdm *gdm = arg;
 
-	if (!GDM_TTY_READY(gdm))
+	if (!gdm_tty_ready(gdm))
 		return;
 
 	tty_port_tty_wakeup(&gdm->port);
@@ -160,7 +163,7 @@ static int gdm_tty_write(struct tty_struct *tty, const unsigned char *buf,
 	int sent_len = 0;
 	int sending_len = 0;
 
-	if (!GDM_TTY_READY(gdm))
+	if (!gdm_tty_ready(gdm))
 		return -ENODEV;
 
 	if (!len)
@@ -187,7 +190,7 @@ static int gdm_tty_write_room(struct tty_struct *tty)
 {
 	struct gdm *gdm = tty->driver_data;
 
-	if (!GDM_TTY_READY(gdm))
+	if (!gdm_tty_ready(gdm))
 		return -ENODEV;
 
 	return WRITE_SIZE;
-- 
2.28.0