staging: dgnc: check the type of print before calling

The dgnc_maxcps_room() function must be called only for print device.
The if-statement for checking print device checks before calling
dgnc_maxcps_room() and also this function doesn't need to have any
data except channel_t.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index e4c6c3f..31b18e6 100644 (file)
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -1492,18 +1492,8 @@ static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
  * returns the new bytes_available.  This only affects printer
  * output.
  */
-static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available)
+static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available)
 {
-       struct un_t *un = tty->driver_data;
-       struct channel_t *ch = un->un_ch;
-
-       /*
-        * If its not the Transparent print device, return
-        * the full data amount.
-        */
-       if (un->un_type != DGNC_PRINT)
-               return bytes_available;
-
        if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) {
                int cps_limit = 0;
                unsigned long current_time = jiffies;
@@ -1567,7 +1557,8 @@ static int dgnc_tty_write_room(struct tty_struct *tty)
                ret += WQUEUESIZE;
 
        /* Limit printer to maxcps */
-       ret = dgnc_maxcps_room(tty, ret);
+       if (un->un_type != DGNC_PRINT)
+               ret = dgnc_maxcps_room(ch, ret);
 
        /*
         * If we are printer device, leave space for
@@ -1659,7 +1650,8 @@ static int dgnc_tty_write(struct tty_struct *tty,
         * Limit printer output to maxcps overall, with bursts allowed
         * up to bufsize characters.
         */
-       bufcount = dgnc_maxcps_room(tty, bufcount);
+       if (un->un_type != DGNC_PRINT)
+               bufcount = dgnc_maxcps_room(ch, bufcount);
 
        /*
         * Take minimum of what the user wants to send, and the