linux-kernel - [PATCH 7/7] USB: serial: clean up chars_in

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Date:	Sun,  5 May 2013 20:32:33 +0200
From:	Johan Hovold <jhovold@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Stas Sergeev <stsp@...t.ru>,
	Jarkko Huijts <jarkko.huijts@...il.com>,
	Alan Cox <alan@...ux.intel.com>, linux-usb@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Caylan Van Larson <i@...lan.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Johan Hovold <jhovold@...il.com>
Subject: [PATCH 7/7] USB: serial: clean up chars_in_buffer

No need to grab disconnect mutex in chars_in_buffer now that no
sub-driver is or should be querying hardware buffers anymore. (They
should use wait_until_sent.)

Signed-off-by: Johan Hovold <jhovold@...il.com>
---
 drivers/usb/serial/usb-serial.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 60caf9c..4753c00 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -359,20 +359,13 @@ static int serial_chars_in_buffer(struct tty_struct *tty)
 {
 	struct usb_serial_port *port = tty->driver_data;
 	struct usb_serial *serial = port->serial;
-	int count = 0;
 
 	dev_dbg(tty->dev, "%s\n", __func__);
 
-	mutex_lock(&serial->disc_mutex);
-	/* if the device was unplugged then any remaining characters
-	   fell out of the connector ;) */
 	if (serial->disconnected)
-		count = 0;
-	else
-		count = serial->type->chars_in_buffer(tty);
-	mutex_unlock(&serial->disc_mutex);
+		return 0;
 
-	return count;
+	return serial->type->chars_in_buffer(tty);
 }
 
 static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
-- 
1.8.2.1

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