tty: remove dummy tty_ldisc_ops::poll() implementations

tty_ldisc_ops::poll() is optional and needs not be provided. It is equal
to returning 0. So remove all those from the code.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
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: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230810091510.13006-4-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 0 insertions, 30 deletions

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index efdda2c3fce8..5224b0961200 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -818,12 +818,6 @@ static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 	return 0;
 }
 
-static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
-				      struct file *filp, poll_table *wait)
-{
-	return 0;
-}
-
 static struct tty_ldisc_ops hci_uart_ldisc = {
 	.owner		= THIS_MODULE,
 	.num		= N_HCI,
@@ -834,7 +828,6 @@ static struct tty_ldisc_ops hci_uart_ldisc = {
 	.write		= hci_uart_tty_write,
 	.ioctl		= hci_uart_tty_ioctl,
 	.compat_ioctl	= hci_uart_tty_ioctl,
-	.poll		= hci_uart_tty_poll,
 	.receive_buf	= hci_uart_tty_receive,
 	.write_wakeup	= hci_uart_tty_wakeup,
 };
diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c
index 15a179631903..f420bddb6a8c 100644
--- a/drivers/net/ppp/ppp_async.c
+++ b/drivers/net/ppp/ppp_async.c
@@ -328,13 +328,6 @@ ppp_asynctty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
 	return err;
 }
 
-/* No kernel lock - fine */
-static __poll_t
-ppp_asynctty_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
-{
-	return 0;
-}
-
 /* May sleep, don't call from interrupt level or with interrupts disabled */
 static void
 ppp_asynctty_receive(struct tty_struct *tty, const unsigned char *buf,
@@ -378,7 +371,6 @@ static struct tty_ldisc_ops ppp_ldisc = {
 	.read	= ppp_asynctty_read,
 	.write	= ppp_asynctty_write,
 	.ioctl	= ppp_asynctty_ioctl,
-	.poll	= ppp_asynctty_poll,
 	.receive_buf = ppp_asynctty_receive,
 	.write_wakeup = ppp_asynctty_wakeup,
 };
diff --git a/drivers/net/ppp/ppp_synctty.c b/drivers/net/ppp/ppp_synctty.c
index 18283b7b94bc..86dacef84c6c 100644
--- a/drivers/net/ppp/ppp_synctty.c
+++ b/drivers/net/ppp/ppp_synctty.c
@@ -321,13 +321,6 @@ ppp_synctty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
 	return err;
 }
 
-/* No kernel lock - fine */
-static __poll_t
-ppp_sync_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
-{
-	return 0;
-}
-
 /* May sleep, don't call from interrupt level or with interrupts disabled */
 static void
 ppp_sync_receive(struct tty_struct *tty, const unsigned char *buf,
@@ -371,7 +364,6 @@ static struct tty_ldisc_ops ppp_sync_ldisc = {
 	.read	= ppp_sync_read,
 	.write	= ppp_sync_write,
 	.ioctl	= ppp_synctty_ioctl,
-	.poll	= ppp_sync_poll,
 	.receive_buf = ppp_sync_receive,
 	.write_wakeup = ppp_sync_wakeup,
 };
diff --git a/net/nfc/nci/uart.c b/net/nfc/nci/uart.c
index 082f94be0996..c8249d95306d 100644
--- a/net/nfc/nci/uart.c
+++ b/net/nfc/nci/uart.c
@@ -357,12 +357,6 @@ static ssize_t nci_uart_tty_write(struct tty_struct *tty, struct file *file,
 	return 0;
 }
 
-static __poll_t nci_uart_tty_poll(struct tty_struct *tty,
-				      struct file *filp, poll_table *wait)
-{
-	return 0;
-}
-
 static int nci_uart_send(struct nci_uart *nu, struct sk_buff *skb)
 {
 	/* Queue TX packet */
@@ -435,7 +429,6 @@ static struct tty_ldisc_ops nci_uart_ldisc = {
 	.close		= nci_uart_tty_close,
 	.read		= nci_uart_tty_read,
 	.write		= nci_uart_tty_write,
-	.poll		= nci_uart_tty_poll,
 	.receive_buf	= nci_uart_tty_receive,
 	.write_wakeup	= nci_uart_tty_wakeup,
 	.ioctl		= nci_uart_tty_ioctl,