sysrq: remove duplicated #include

[safe/jmp/linux-2.6] / drivers / char / hvc_console.c

diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 3650c90..94e7e3c 100644 (file)
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -318,7 +318,6 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
        } /* else count == 0 */
 
        tty->driver_data = hp;
-       tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
 
        hp->tty = tty;
 
@@ -374,6 +373,9 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
                if (hp->ops->notifier_del)
                        hp->ops->notifier_del(hp, hp->data);
 
+               /* cancel pending tty resize work */
+               cancel_work_sync(&hp->tty_resize);
+
                /*
                 * Chain calls chars_in_buffer() and returns immediately if
                 * there is no buffered data otherwise sleeps on a wait queue
@@ -399,6 +401,9 @@ static void hvc_hangup(struct tty_struct *tty)
        if (!hp)
                return;
 
+       /* cancel pending tty resize work */
+       cancel_work_sync(&hp->tty_resize);
+
        spin_lock_irqsave(&hp->lock, flags);
 
        /*
@@ -494,6 +499,39 @@ static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count
        return written;
 }
 
+/**
+ * hvc_set_winsz() - Resize the hvc tty terminal window.
+ * @work:      work structure.
+ *
+ * The routine shall not be called within an atomic context because it
+ * might sleep.
+ *
+ * Locking:    hp->lock
+ */
+static void hvc_set_winsz(struct work_struct *work)
+{
+       struct hvc_struct *hp;
+       unsigned long hvc_flags;
+       struct tty_struct *tty;
+       struct winsize ws;
+
+       hp = container_of(work, struct hvc_struct, tty_resize);
+       if (!hp)
+               return;
+
+       spin_lock_irqsave(&hp->lock, hvc_flags);
+       if (!hp->tty) {
+               spin_unlock_irqrestore(&hp->lock, hvc_flags);
+               return;
+       }
+       ws  = hp->ws;
+       tty = tty_kref_get(hp->tty);
+       spin_unlock_irqrestore(&hp->lock, hvc_flags);
+
+       tty_do_resize(tty, &ws);
+       tty_kref_put(tty);
+}
+
 /*
  * This is actually a contract between the driver and the tty layer outlining
  * how much write room the driver can guarantee will be sent OR BUFFERED.  This
@@ -603,8 +641,11 @@ int hvc_poll(struct hvc_struct *hp)
                                /* Handle the SysRq Hack */
                                /* XXX should support a sequence */
                                if (buf[i] == '\x0f') { /* ^O */
-                                       sysrq_pressed = 1;
-                                       continue;
+                                       /* if ^O is pressed again, reset
+                                        * sysrq_pressed and flip ^O char */
+                                       sysrq_pressed = !sysrq_pressed;
+                                       if (sysrq_pressed)
+                                               continue;
                                } else if (sysrq_pressed) {
                                        handle_sysrq(buf[i], tty);
                                        sysrq_pressed = 0;
@@ -638,6 +679,23 @@ int hvc_poll(struct hvc_struct *hp)
 }
 EXPORT_SYMBOL_GPL(hvc_poll);
 
+/**
+ * hvc_resize() - Update terminal window size information.
+ * @hp:                HVC console pointer
+ * @ws:                Terminal window size structure
+ *
+ * Stores the specified window size information in the hvc structure of @hp.
+ * The function schedule the tty resize update.
+ *
+ * Locking:    Locking free; the function MUST be called holding hp->lock
+ */
+void hvc_resize(struct hvc_struct *hp, struct winsize ws)
+{
+       hp->ws = ws;
+       schedule_work(&hp->tty_resize);
+}
+EXPORT_SYMBOL_GPL(hvc_resize);
+
 /*
  * This kthread is either polling or interrupt driven.  This is determined by
  * calling hvc_poll() who determines whether a console adapter support
@@ -705,13 +763,11 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int data,
                        return ERR_PTR(err);
        }
 
-       hp = kmalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
+       hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
                        GFP_KERNEL);
        if (!hp)
                return ERR_PTR(-ENOMEM);
 
-       memset(hp, 0x00, sizeof(*hp));
-
        hp->vtermno = vtermno;
        hp->data = data;
        hp->ops = ops;
@@ -720,6 +776,7 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int data,
 
        kref_init(&hp->kref);
 
+       INIT_WORK(&hp->tty_resize, hvc_set_winsz);
        spin_lock_init(&hp->lock);
        spin_lock(&hvc_structs_lock);
 
@@ -745,7 +802,7 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int data,
 }
 EXPORT_SYMBOL_GPL(hvc_alloc);
 
-int __devexit hvc_remove(struct hvc_struct *hp)
+int hvc_remove(struct hvc_struct *hp)
 {
        unsigned long flags;
        struct tty_struct *tty;
@@ -816,8 +873,11 @@ static int hvc_init(void)
                goto stop_thread;
        }
 
-       /* FIXME: This mb() seems completely random.  Remove it. */
-       mb();
+       /*
+        * Make sure tty is fully registered before allowing it to be
+        * found by hvc_console_device.
+        */
+       smp_mb();
        hvc_driver = drv;
        return 0;