diff options
Diffstat (limited to 'drivers/char/n_hdlc.c')
| -rw-r--r-- | drivers/char/n_hdlc.c | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c index 9319b777a..0dc5a7cca 100644 --- a/drivers/char/n_hdlc.c +++ b/drivers/char/n_hdlc.c @@ -9,6 +9,7 @@ * Al Longyear <longyear@netcom.com>, Paul Mackerras <Paul.Mackerras@cs.anu.edu.au> * * Original release 01/11/99 + * ==FILEDATE 19990524== * * This code is released under the GNU General Public License (GPL) * @@ -72,7 +73,7 @@ */ #define HDLC_MAGIC 0x239e -#define HDLC_VERSION "1.0" +#define HDLC_VERSION "1.2" #include <linux/version.h> #include <linux/config.h> @@ -813,6 +814,8 @@ static int n_hdlc_tty_ioctl (struct tty_struct *tty, struct file * file, { struct n_hdlc *n_hdlc = tty2n_hdlc (tty); int error = 0; + int count; + unsigned long flags; if (debuglevel >= DEBUG_LEVEL_INFO) printk("%s(%d)n_hdlc_tty_ioctl() called %d\n", @@ -824,21 +827,29 @@ static int n_hdlc_tty_ioctl (struct tty_struct *tty, struct file * file, switch (cmd) { case FIONREAD: - { - /* report count of read data available */ - /* in next available frame (if any) */ - int count; - unsigned long flags; - spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock,flags); - if (n_hdlc->rx_buf_list.head) - count = n_hdlc->rx_buf_list.head->count; - else - count = 0; - spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock,flags); - PUT_USER (error, count, (int *) arg); - } + /* report count of read data available */ + /* in next available frame (if any) */ + spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock,flags); + if (n_hdlc->rx_buf_list.head) + count = n_hdlc->rx_buf_list.head->count; + else + count = 0; + spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock,flags); + PUT_USER (error, count, (int *) arg); break; - + + case TIOCOUTQ: + /* get the pending tx byte count in the driver */ + count = tty->driver.chars_in_buffer ? + tty->driver.chars_in_buffer(tty) : 0; + /* add size of next output frame in queue */ + spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock,flags); + if (n_hdlc->tx_buf_list.head) + count += n_hdlc->tx_buf_list.head->count; + spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock,flags); + PUT_USER (error, count, (int*)arg); + break; + default: error = n_tty_ioctl (tty, file, cmd, arg); break; |