diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-06-26 16:47:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-23 16:28:23 -0700 |
| commit | 4833960e503549cd73aadc89be5b0c9da0563b5c (patch) | |
| tree | 39753314954bd036221bfc41a0f5df090347c9a3 /drivers/usb | |
| parent | 0fce06da6bb49a3973b7c2ab174761fbc848ca6c (diff) | |
USB: mos7840: remove broken chase implementation
Remove broken "chase" implementation which was supposed to be used to
drain the write buffers at break.
The chase implementation slept on a wait queue which was never woken up
(i.e. no hardware buffers were queried), and thus amounted to nothing
more than polling chars_in_buffer, something which has already been
taken care of by the tty layer.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/serial/mos7840.c | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index 0a818b23850..dff27e6b677 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -218,7 +218,6 @@ struct moschip_port { __u8 shadowMCR; /* last MCR value received */ char open; char open_ports; - wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */ struct usb_serial_port *port; /* loop back to the owner of this object */ /* Offsets */ @@ -1092,9 +1091,6 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port) mos7840_port->read_urb_busy = false; } - /* initialize our wait queues */ - init_waitqueue_head(&mos7840_port->wait_chase); - /* initialize our port settings */ /* Must set to enable ints! */ mos7840_port->shadowMCR = MCR_MASTER_IE; @@ -1211,47 +1207,6 @@ static void mos7840_close(struct usb_serial_port *port) mos7840_port->open = 0; } -/************************************************************************ - * - * mos7840_block_until_chase_response - * - * This function will block the close until one of the following: - * 1. Response to our Chase comes from mos7840 - * 2. A timeout of 10 seconds without activity has expired - * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty) - * - ************************************************************************/ - -static void mos7840_block_until_chase_response(struct tty_struct *tty, - struct moschip_port *mos7840_port) -{ - int timeout = msecs_to_jiffies(1000); - int wait = 10; - int count; - - while (1) { - count = mos7840_chars_in_buffer(tty); - - /* Check for Buffer status */ - if (count <= 0) - return; - - /* Block the thread for a while */ - interruptible_sleep_on_timeout(&mos7840_port->wait_chase, - timeout); - /* No activity.. count down section */ - wait--; - if (wait == 0) { - dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__); - return; - } else { - /* Reset timeout value back to seconds */ - wait = 10; - } - } - -} - /***************************************************************************** * mos7840_break * this function sends a break to the port @@ -1275,9 +1230,6 @@ static void mos7840_break(struct tty_struct *tty, int break_state) if (mos7840_port == NULL) return; - /* flush and block until tx is empty */ - mos7840_block_until_chase_response(tty, mos7840_port); - if (break_state == -1) data = mos7840_port->shadowLCR | LCR_SET_BREAK; else |