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@gmail.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -2008,39 +2008,14 @@ static int ftdi_chars_in_buffer(struct tty_struct *tty)
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static void ftdi_read_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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struct tty_struct *tty;
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struct ftdi_private *priv;
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int status = urb->status;
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if (urb->number_of_packets > 0) {
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dev_err(&port->dev, "%s transfer_buffer_length %d "
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"actual_length %d number of packets %d\n", __func__,
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urb->transfer_buffer_length,
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urb->actual_length, urb->number_of_packets);
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dev_err(&port->dev, "%s transfer_flags %x\n", __func__,
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urb->transfer_flags);
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}
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dbg("%s - port %d", __func__, port->number);
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if (port->port.count <= 0)
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return;
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tty = tty_port_tty_get(&port->port);
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if (!tty) {
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dbg("%s - bad tty pointer - exiting", __func__);
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return;
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}
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priv = usb_get_serial_port_data(port);
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if (!priv) {
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dbg("%s - bad port private data pointer - exiting", __func__);
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goto out;
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}
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if (urb != port->read_urb)
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dev_err(&port->dev, "%s - Not my urb!\n", __func__);
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if (status) {
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/* This will happen at close every time so it is a dbg not an
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err */
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@ -2048,9 +2023,8 @@ static void ftdi_read_bulk_callback(struct urb *urb)
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goto out;
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}
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priv = usb_get_serial_port_data(port);
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ftdi_process_read(&priv->rx_work.work);
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out:
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tty_kref_put(tty);
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} /* ftdi_read_bulk_callback */
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