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authorAlan Cox <alan@redhat.com>2009-01-02 16:46:10 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-02 21:19:39 +0300
commit36c621d82b956ff6ff72273f848af53e6c581aba (patch)
treeedd387d8275a8f25277d264ffed94e8d1c2ba048 /drivers/char/riscom8.c
parent3b6826b250633361f08a6427a4ac0035e5d88c72 (diff)
downloadlinux-36c621d82b956ff6ff72273f848af53e6c581aba.tar.xz
tty: Introduce a tty_port generic block_til_ready
Start sucking more commonality out of the drivers into a single piece of core code. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/riscom8.c')
-rw-r--r--drivers/char/riscom8.c86
1 files changed, 1 insertions, 85 deletions
diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index 14662d7aa628..af34c2054a09 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -874,90 +874,6 @@ static int carrier_raised(struct tty_port *port)
return CD;
}
-static int block_til_ready(struct tty_struct *tty, struct file *filp,
- struct riscom_port *rp)
-{
- DECLARE_WAITQUEUE(wait, current);
- int retval;
- int do_clocal = 0;
- int CD;
- unsigned long flags;
- struct tty_port *port = &rp->port;
-
- /*
- * If the device is in the middle of being closed, then block
- * until it's done, and then try again.
- */
- if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
- interruptible_sleep_on(&port->close_wait);
- if (port->flags & ASYNC_HUP_NOTIFY)
- return -EAGAIN;
- else
- return -ERESTARTSYS;
- }
-
- /*
- * If non-blocking mode is set, or the port is not enabled,
- * then make the check up front and then exit.
- */
- if ((filp->f_flags & O_NONBLOCK) ||
- (tty->flags & (1 << TTY_IO_ERROR))) {
- port->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
-
- if (C_CLOCAL(tty))
- do_clocal = 1;
-
- /*
- * Block waiting for the carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, info->count is dropped by one, so that
- * rs_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&port->open_wait, &wait);
-
- spin_lock_irqsave(&port->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count--;
- port->blocked_open++;
- spin_unlock_irqrestore(&port->lock, flags);
-
- while (1) {
-
- CD = tty_port_carrier_raised(port);
- set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !(port->flags & ASYNC_INITIALIZED)) {
- if (port->flags & ASYNC_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
- break;
- }
- if (!(port->flags & ASYNC_CLOSING) &&
- (do_clocal || CD))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- schedule();
- }
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&port->open_wait, &wait);
- spin_lock_irqsave(&port->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count++;
- port->blocked_open--;
- if (retval == 0)
- port->flags |= ASYNC_NORMAL_ACTIVE;
- spin_unlock_irqrestore(&port->lock, flags);
- return 0;
-}
-
static int rc_open(struct tty_struct *tty, struct file *filp)
{
int board;
@@ -984,7 +900,7 @@ static int rc_open(struct tty_struct *tty, struct file *filp)
error = rc_setup_port(bp, port);
if (error == 0)
- error = block_til_ready(tty, filp, port);
+ error = tty_port_block_til_ready(&port->port, tty, filp);
return error;
}