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USB: ftdi_sio: clean up read completion handler

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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@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold 2009-10-07 20:05:06 +02:00 committed by Greg Kroah-Hartman
parent 63b0061246
commit e63e278b4d
1 changed files with 1 additions and 27 deletions
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28
drivers/usb/serial/ftdi_sio.c
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@ -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 */