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From: Johan Hovold <johan@kernel.org>
To: Johan Hovold <johan@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Subject: [PATCH 2/2] USB: serial: whiteheat: fix line-speed endianness
Date: Tue, 29 Oct 2019 11:23:54 +0100
Message-ID: <20191029102354.2733-3-johan@kernel.org> (raw)
In-Reply-To: <20191029102354.2733-1-johan@kernel.org>

Add missing endianness conversion when setting the line speed so that
this driver might work also on big-endian machines.

Also use an unsigned format specifier in the corresponding debug
message.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/whiteheat.c | 9 ++++++---
 drivers/usb/serial/whiteheat.h | 2 +-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 76cabcb30d21..ca3bd58f2025 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -636,6 +636,7 @@ static void firm_setup_port(struct tty_struct *tty)
 	struct device *dev = &port->dev;
 	struct whiteheat_port_settings port_settings;
 	unsigned int cflag = tty->termios.c_cflag;
+	speed_t baud;
 
 	port_settings.port = port->port_number + 1;
 
@@ -696,11 +697,13 @@ static void firm_setup_port(struct tty_struct *tty)
 	dev_dbg(dev, "%s - XON = %2x, XOFF = %2x\n", __func__, port_settings.xon, port_settings.xoff);
 
 	/* get the baud rate wanted */
-	port_settings.baud = tty_get_baud_rate(tty);
-	dev_dbg(dev, "%s - baud rate = %d\n", __func__, port_settings.baud);
+	baud = tty_get_baud_rate(tty);
+	port_settings.baud = cpu_to_le32(baud);
+	dev_dbg(dev, "%s - baud rate = %u\n", __func__, baud);
 
 	/* fixme: should set validated settings */
-	tty_encode_baud_rate(tty, port_settings.baud, port_settings.baud);
+	tty_encode_baud_rate(tty, baud, baud);
+
 	/* handle any settings that aren't specified in the tty structure */
 	port_settings.lloop = 0;
 
diff --git a/drivers/usb/serial/whiteheat.h b/drivers/usb/serial/whiteheat.h
index 00398149cd8d..269e727a92f9 100644
--- a/drivers/usb/serial/whiteheat.h
+++ b/drivers/usb/serial/whiteheat.h
@@ -87,7 +87,7 @@ struct whiteheat_simple {
 
 struct whiteheat_port_settings {
 	__u8	port;		/* port number (1 to N) */
-	__u32	baud;		/* any value 7 - 460800, firmware calculates
+	__le32	baud;		/* any value 7 - 460800, firmware calculates
 				   best fit; arrives little endian */
 	__u8	bits;		/* 5, 6, 7, or 8 */
 	__u8	stop;		/* 1 or 2, default 1 (2 = 1.5 if bits = 5) */
-- 
2.23.0


      parent reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-29 10:23 [PATCH 0/2] USB: serial: whiteheat: fix slab corruption and endianness bug Johan Hovold
2019-10-29 10:23 ` [PATCH 1/2] USB: serial: whiteheat: fix potential slab corruption Johan Hovold
2019-10-29 10:23 ` Johan Hovold [this message]

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