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authorAlan Cox <alan@redhat.com>2009-01-02 13:45:26 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-02 10:19:38 -0800
commit3e61696bdc2103107674b06d0daf30b76193e922 (patch)
treecc4f2b7b7b0ce2162613bb9d3cf819f6bbfd3628 /drivers/char/tty_port.c
parent5d951fb458f847e5485b5251597fbf326000bb3b (diff)
downloadblackbird-op-linux-3e61696bdc2103107674b06d0daf30b76193e922.tar.gz
blackbird-op-linux-3e61696bdc2103107674b06d0daf30b76193e922.zip
isicom: redo locking to use tty port locks
This helps set the basis for moving block_til_ready into common code. We also introduce a tty_port_hangup helper as this will also be generally needed. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_port.c')
-rw-r--r--drivers/char/tty_port.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 0557b6384747..9f418bca4a22 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -7,6 +7,7 @@
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
+#include <linux/serial.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/slab.h>
@@ -96,6 +97,29 @@ void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
EXPORT_SYMBOL(tty_port_tty_set);
/**
+ * tty_port_hangup - hangup helper
+ * @port: tty port
+ *
+ * Perform port level tty hangup flag and count changes. Drop the tty
+ * reference.
+ */
+
+void tty_port_hangup(struct tty_port *port)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+ port->count = 0;
+ port->flags &= ~ASYNC_NORMAL_ACTIVE;
+ if (port->tty)
+ tty_kref_put(port->tty);
+ port->tty = NULL;
+ spin_unlock_irqrestore(&port->lock, flags);
+ wake_up_interruptible(&port->open_wait);
+}
+EXPORT_SYMBOL(tty_port_hangup);
+
+/**
* tty_port_carrier_raised - carrier raised check
* @port: tty port
*
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