diff options
Diffstat (limited to 'drivers/usb/serial/digi_acceleport.c')
| -rw-r--r-- | drivers/usb/serial/digi_acceleport.c | 62 |
1 files changed, 21 insertions, 41 deletions
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c index 91055a191995..0ecd5316d85f 100644 --- a/drivers/usb/serial/digi_acceleport.c +++ b/drivers/usb/serial/digi_acceleport.c @@ -19,7 +19,6 @@ #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/spinlock.h> -#include <linux/workqueue.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/wait.h> @@ -198,14 +197,13 @@ struct digi_port { int dp_throttle_restart; wait_queue_head_t dp_flush_wait; wait_queue_head_t dp_close_wait; /* wait queue for close */ - struct work_struct dp_wakeup_work; + wait_queue_head_t write_wait; struct usb_serial_port *dp_port; }; /* Local Function Declarations */ -static void digi_wakeup_write_lock(struct work_struct *work); static int digi_write_oob_command(struct usb_serial_port *port, unsigned char *buf, int count, int interruptible); static int digi_write_inb_command(struct usb_serial_port *port, @@ -356,26 +354,6 @@ __releases(lock) return timeout; } - -/* - * Digi Wakeup Write - * - * Wake up port, line discipline, and tty processes sleeping - * on writes. - */ - -static void digi_wakeup_write_lock(struct work_struct *work) -{ - struct digi_port *priv = - container_of(work, struct digi_port, dp_wakeup_work); - struct usb_serial_port *port = priv->dp_port; - unsigned long flags; - - spin_lock_irqsave(&priv->dp_port_lock, flags); - tty_port_tty_wakeup(&port->port); - spin_unlock_irqrestore(&priv->dp_port_lock, flags); -} - /* * Digi Write OOB Command * @@ -404,7 +382,7 @@ static int digi_write_oob_command(struct usb_serial_port *port, while (count > 0) { while (oob_priv->dp_write_urb_in_use) { cond_wait_interruptible_timeout_irqrestore( - &oob_port->write_wait, DIGI_RETRY_TIMEOUT, + &oob_priv->write_wait, DIGI_RETRY_TIMEOUT, &oob_priv->dp_port_lock, flags); if (interruptible && signal_pending(current)) return -EINTR; @@ -467,7 +445,7 @@ static int digi_write_inb_command(struct usb_serial_port *port, while (priv->dp_write_urb_in_use && time_before(jiffies, timeout)) { cond_wait_interruptible_timeout_irqrestore( - &port->write_wait, DIGI_RETRY_TIMEOUT, + &priv->write_wait, DIGI_RETRY_TIMEOUT, &priv->dp_port_lock, flags); if (signal_pending(current)) return -EINTR; @@ -546,7 +524,7 @@ static int digi_set_modem_signals(struct usb_serial_port *port, while (oob_priv->dp_write_urb_in_use) { spin_unlock(&port_priv->dp_port_lock); cond_wait_interruptible_timeout_irqrestore( - &oob_port->write_wait, DIGI_RETRY_TIMEOUT, + &oob_priv->write_wait, DIGI_RETRY_TIMEOUT, &oob_priv->dp_port_lock, flags); if (interruptible && signal_pending(current)) return -EINTR; @@ -911,9 +889,8 @@ static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, unsigned char *data = port->write_urb->transfer_buffer; unsigned long flags = 0; - dev_dbg(&port->dev, - "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n", - priv->dp_port_num, count, in_interrupt()); + dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d\n", + priv->dp_port_num, count); /* copy user data (which can sleep) before getting spin lock */ count = min(count, port->bulk_out_size-2); @@ -986,6 +963,7 @@ static void digi_write_bulk_callback(struct urb *urb) unsigned long flags; int ret = 0; int status = urb->status; + bool wakeup; /* port and serial sanity check */ if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) { @@ -1006,12 +984,13 @@ static void digi_write_bulk_callback(struct urb *urb) dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n"); spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_write_urb_in_use = 0; - wake_up_interruptible(&port->write_wait); + wake_up_interruptible(&priv->write_wait); spin_unlock_irqrestore(&priv->dp_port_lock, flags); return; } /* try to send any buffered data on this port */ + wakeup = true; spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_write_urb_in_use = 0; if (priv->dp_out_buf_len > 0) { @@ -1027,19 +1006,18 @@ static void digi_write_bulk_callback(struct urb *urb) if (ret == 0) { priv->dp_write_urb_in_use = 1; priv->dp_out_buf_len = 0; + wakeup = false; } } - /* wake up processes sleeping on writes immediately */ - tty_port_tty_wakeup(&port->port); - /* also queue up a wakeup at scheduler time, in case we */ - /* lost the race in write_chan(). */ - schedule_work(&priv->dp_wakeup_work); - spin_unlock_irqrestore(&priv->dp_port_lock, flags); + if (ret && ret != -EPERM) dev_err_console(port, "%s: usb_submit_urb failed, ret=%d, port=%d\n", __func__, ret, priv->dp_port_num); + + if (wakeup) + tty_port_tty_wakeup(&port->port); } static int digi_write_room(struct tty_struct *tty) @@ -1239,11 +1217,9 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num) init_waitqueue_head(&priv->dp_transmit_idle_wait); init_waitqueue_head(&priv->dp_flush_wait); init_waitqueue_head(&priv->dp_close_wait); - INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock); + init_waitqueue_head(&priv->write_wait); priv->dp_port = port; - init_waitqueue_head(&port->write_wait); - usb_set_serial_port_data(port, priv); return 0; @@ -1508,13 +1484,14 @@ static int digi_read_oob_callback(struct urb *urb) rts = C_CRTSCTS(tty); if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) { + bool wakeup = false; + spin_lock_irqsave(&priv->dp_port_lock, flags); /* convert from digi flags to termiox flags */ if (val & DIGI_READ_INPUT_SIGNALS_CTS) { priv->dp_modem_signals |= TIOCM_CTS; - /* port must be open to use tty struct */ if (rts) - tty_port_tty_wakeup(&port->port); + wakeup = true; } else { priv->dp_modem_signals &= ~TIOCM_CTS; /* port must be open to use tty struct */ @@ -1533,6 +1510,9 @@ static int digi_read_oob_callback(struct urb *urb) priv->dp_modem_signals &= ~TIOCM_CD; spin_unlock_irqrestore(&priv->dp_port_lock, flags); + + if (wakeup) + tty_port_tty_wakeup(&port->port); } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) { spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_transmit_idle = 1; |