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authorAlan Cox <alan@redhat.com>2009-01-02 13:45:05 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-02 10:19:38 -0800
commit31f35939d1d9bcfb3099b32c67b896d2792603f9 (patch)
tree39b6ceaf0e7477e0357ff8235814f579adad3f28 /drivers/char/generic_serial.c
parentc9b3976e3fec266be25c5001a70aa0a890b6c476 (diff)
downloadop-kernel-dev-31f35939d1d9bcfb3099b32c67b896d2792603f9.zip
op-kernel-dev-31f35939d1d9bcfb3099b32c67b896d2792603f9.tar.gz
tty_port: Add a port level carrier detect operation
This is the first step to generalising the various pieces of waiting logic duplicated in all sorts of serial drivers. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/generic_serial.c')
-rw-r--r--drivers/char/generic_serial.c43
1 files changed, 22 insertions, 21 deletions
diff --git a/drivers/char/generic_serial.c b/drivers/char/generic_serial.c
index c6090f8..2356994 100644
--- a/drivers/char/generic_serial.c
+++ b/drivers/char/generic_serial.c
@@ -397,7 +397,8 @@ void gs_hangup(struct tty_struct *tty)
int gs_block_til_ready(void *port_, struct file * filp)
{
- struct gs_port *port = port_;
+ struct gs_port *gp = port_;
+ struct tty_port *port = &gp->port;
DECLARE_WAITQUEUE(wait, current);
int retval;
int do_clocal = 0;
@@ -409,16 +410,16 @@ int gs_block_til_ready(void *port_, struct file * filp)
if (!port) return 0;
- tty = port->port.tty;
+ tty = port->tty;
gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n");
/*
* 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->port.flags & ASYNC_CLOSING) {
- interruptible_sleep_on(&port->port.close_wait);
- if (port->port.flags & ASYNC_HUP_NOTIFY)
+ 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;
@@ -432,7 +433,7 @@ int gs_block_til_ready(void *port_, struct file * filp)
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
- port->port.flags |= ASYNC_NORMAL_ACTIVE;
+ port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@@ -444,34 +445,34 @@ int gs_block_til_ready(void *port_, struct file * filp)
/*
* 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, port->port.count is dropped by one, so that
+ * this loop, port->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->port.open_wait, &wait);
+ add_wait_queue(&port->open_wait, &wait);
gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n");
- spin_lock_irqsave(&port->driver_lock, flags);
+ spin_lock_irqsave(&gp->driver_lock, flags);
if (!tty_hung_up_p(filp)) {
- port->port.count--;
+ port->count--;
}
- spin_unlock_irqrestore(&port->driver_lock, flags);
- port->port.blocked_open++;
+ spin_unlock_irqrestore(&gp->driver_lock, flags);
+ port->blocked_open++;
while (1) {
- CD = port->rd->get_CD (port);
+ CD = tty_port_carrier_raised(port);
gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD);
set_current_state (TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
- !(port->port.flags & ASYNC_INITIALIZED)) {
- if (port->port.flags & ASYNC_HUP_NOTIFY)
+ !(port->flags & ASYNC_INITIALIZED)) {
+ if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
- if (!(port->port.flags & ASYNC_CLOSING) &&
+ if (!(port->flags & ASYNC_CLOSING) &&
(do_clocal || CD))
break;
gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n",
@@ -483,17 +484,17 @@ int gs_block_til_ready(void *port_, struct file * filp)
schedule();
}
gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n",
- port->port.blocked_open);
+ port->blocked_open);
set_current_state (TASK_RUNNING);
- remove_wait_queue(&port->port.open_wait, &wait);
+ remove_wait_queue(&port->open_wait, &wait);
if (!tty_hung_up_p(filp)) {
- port->port.count++;
+ port->count++;
}
- port->port.blocked_open--;
+ port->blocked_open--;
if (retval)
return retval;
- port->port.flags |= ASYNC_NORMAL_ACTIVE;
+ port->flags |= ASYNC_NORMAL_ACTIVE;
func_exit ();
return 0;
}
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