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Message-Id: <20210512144847.306180744@linuxfoundation.org>
Date: Wed, 12 May 2021 16:45:50 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 304/677] serial: core: return early on unsupported ioctls
From: Johan Hovold <johan@...nel.org>
[ Upstream commit 79c5966cec7b148199386ef9933c31b999379065 ]
Drivers can return -ENOIOCTLCMD when an ioctl is not recognised to tell
the upper layers to continue looking for a handler.
This is not the case for the RS485 and ISO7816 ioctls whose handlers
should return -ENOTTY directly in case a serial driver does not
implement the corresponding methods.
Fixes: a5f276f10ff7 ("serial_core: Handle TIOC[GS]RS485 ioctls.")
Fixes: ad8c0eaa0a41 ("tty/serial_core: add ISO7816 infrastructure")
Signed-off-by: Johan Hovold <johan@...nel.org>
Link: https://lore.kernel.org/r/20210407095208.31838-9-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/tty/serial/serial_core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index ba31e97d3d96..43f02ed055d5 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1305,7 +1305,7 @@ static int uart_set_rs485_config(struct uart_port *port,
unsigned long flags;
if (!port->rs485_config)
- return -ENOIOCTLCMD;
+ return -ENOTTY;
if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
return -EFAULT;
@@ -1329,7 +1329,7 @@ static int uart_get_iso7816_config(struct uart_port *port,
struct serial_iso7816 aux;
if (!port->iso7816_config)
- return -ENOIOCTLCMD;
+ return -ENOTTY;
spin_lock_irqsave(&port->lock, flags);
aux = port->iso7816;
@@ -1349,7 +1349,7 @@ static int uart_set_iso7816_config(struct uart_port *port,
unsigned long flags;
if (!port->iso7816_config)
- return -ENOIOCTLCMD;
+ return -ENOTTY;
if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
return -EFAULT;
--
2.30.2
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