linux-kernel - [PATCH 3/4] USB: ftdi_sio: clean up read completion handler

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Date:	Wed,  7 Oct 2009 20:05:06 +0200
From:	Johan Hovold <jhovold@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Johan Hovold <jhovold@...il.com>
Subject: [PATCH 3/4] USB: ftdi_sio: clean up read completion handler

Remove superfluous error checks in completion handler:

 - No need to check private data and urb pointers as we check urb-status
   before dereferencing priv (which is not freed until urb has been killed
   on close).
 - No need to check tty as it is checked again when processing.
 - No need to check urb->number_of_packets on bulk urb.

Note that both private data and tty are checked again before processing
(possibly from work queue which also is cancelled on close).

Signed-off-by: Johan Hovold <jhovold@...il.com>
---
 drivers/usb/serial/ftdi_sio.c |   28 +---------------------------
 1 files changed, 1 insertions(+), 27 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index bfb23d6..75c84d9 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2008,39 +2008,14 @@ static int ftdi_chars_in_buffer(struct tty_struct *tty)
 static void ftdi_read_bulk_callback(struct urb *urb)
 {
 	struct usb_serial_port *port = urb->context;
-	struct tty_struct *tty;
 	struct ftdi_private *priv;
 	int status = urb->status;
 
-	if (urb->number_of_packets > 0) {
-		dev_err(&port->dev, "%s transfer_buffer_length %d "
-			"actual_length %d number of packets %d\n", __func__,
-			urb->transfer_buffer_length,
-			urb->actual_length, urb->number_of_packets);
-		dev_err(&port->dev, "%s transfer_flags %x\n", __func__,
-			urb->transfer_flags);
-	}
-
 	dbg("%s - port %d", __func__, port->number);
 
 	if (port->port.count <= 0)
 		return;
 
-	tty = tty_port_tty_get(&port->port);
-	if (!tty) {
-		dbg("%s - bad tty pointer - exiting", __func__);
-		return;
-	}
-
-	priv = usb_get_serial_port_data(port);
-	if (!priv) {
-		dbg("%s - bad port private data pointer - exiting", __func__);
-		goto out;
-	}
-
-	if (urb != port->read_urb)
-		dev_err(&port->dev, "%s - Not my urb!\n", __func__);
-
 	if (status) {
 		/* This will happen at close every time so it is a dbg not an
 		   err */
@@ -2048,9 +2023,8 @@ static void ftdi_read_bulk_callback(struct urb *urb)
 		goto out;
 	}
 
+	priv = usb_get_serial_port_data(port);
 	ftdi_process_read(&priv->rx_work.work);
-out:
-	tty_kref_put(tty);
 } /* ftdi_read_bulk_callback */
 
 
-- 
1.6.5.rc2

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