X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=drivers%2Fchar%2Fvt.c;h=ca4844c527dae7d6fbbed8c13f6ea46c8f564f47;hb=d38fde84f7521973fdfa5c3d03d62f014b42cd03;hp=b8d0c290b0dbf137152a03d3a992ad07e308738a;hpb=55faed1e607a24ca7f3453a3eb463ca8987f8139;p=powerpc.git

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index b8d0c290b0..ca4844c527 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -751,6 +751,7 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 	unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 	unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 	unsigned int new_cols, new_rows, new_row_size, new_screen_size;
+	unsigned int end;
 	unsigned short *newscreen;
 
 	WARN_CONSOLE_UNLOCKED();
@@ -794,20 +795,45 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 	old_origin = vc->vc_origin;
 	new_origin = (long) newscreen;
 	new_scr_end = new_origin + new_screen_size;
-	if (new_rows < old_rows)
-		old_origin += (old_rows - new_rows) * old_row_size;
+
+	if (vc->vc_y > new_rows) {
+		if (old_rows - vc->vc_y < new_rows) {
+			/*
+			 * Cursor near the bottom, copy contents from the
+			 * bottom of buffer
+			 */
+			old_origin += (old_rows - new_rows) * old_row_size;
+			end = vc->vc_scr_end;
+		} else {
+			/*
+			 * Cursor is in no man's land, copy 1/2 screenful
+			 * from the top and bottom of cursor position
+			 */
+			old_origin += (vc->vc_y - new_rows/2) * old_row_size;
+			end = old_origin + (old_row_size * new_rows);
+		}
+	} else
+		/*
+		 * Cursor near the top, copy contents from the top of buffer
+		 */
+		end = (old_rows > new_rows) ? old_origin +
+			(old_row_size * new_rows) :
+			vc->vc_scr_end;
 
 	update_attr(vc);
 
-	while (old_origin < vc->vc_scr_end) {
-		scr_memcpyw((unsigned short *) new_origin, (unsigned short *) old_origin, rlth);
+	while (old_origin < end) {
+		scr_memcpyw((unsigned short *) new_origin,
+			    (unsigned short *) old_origin, rlth);
 		if (rrem)
-			scr_memsetw((void *)(new_origin + rlth), vc->vc_video_erase_char, rrem);
+			scr_memsetw((void *)(new_origin + rlth),
+				    vc->vc_video_erase_char, rrem);
 		old_origin += old_row_size;
 		new_origin += new_row_size;
 	}
 	if (new_scr_end > new_origin)
-		scr_memsetw((void *)new_origin, vc->vc_video_erase_char, new_scr_end - new_origin);
+		scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
+			    new_scr_end - new_origin);
 	if (vc->vc_kmalloced)
 		kfree(vc->vc_screenbuf);
 	vc->vc_screenbuf = newscreen;
@@ -2463,7 +2489,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
 }
 
 /*
- * We take tty_sem in here to prevent another thread from coming in via init_dev
+ * We take tty_mutex in here to prevent another thread from coming in via init_dev
  * and taking a ref against the tty while we're in the process of forgetting
  * about it and cleaning things up.
  *
@@ -2471,7 +2497,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
  */
 static void con_close(struct tty_struct *tty, struct file *filp)
 {
-	down(&tty_sem);
+	mutex_lock(&tty_mutex);
 	acquire_console_sem();
 	if (tty && tty->count == 1) {
 		struct vc_data *vc = tty->driver_data;
@@ -2481,15 +2507,15 @@ static void con_close(struct tty_struct *tty, struct file *filp)
 		tty->driver_data = NULL;
 		release_console_sem();
 		vcs_remove_devfs(tty);
-		up(&tty_sem);
+		mutex_unlock(&tty_mutex);
 		/*
-		 * tty_sem is released, but we still hold BKL, so there is
+		 * tty_mutex is released, but we still hold BKL, so there is
 		 * still exclusion against init_dev()
 		 */
 		return;
 	}
 	release_console_sem();
-	up(&tty_sem);
+	mutex_unlock(&tty_mutex);
 }
 
 static void vc_init(struct vc_data *vc, unsigned int rows,
@@ -2732,29 +2758,6 @@ static void set_vesa_blanking(char __user *p)
     vesa_blank_mode = (mode < 4) ? mode : 0;
 }
 
-/*
- * This is called by a timer handler
- */
-static void vesa_powerdown(void)
-{
-    struct vc_data *c = vc_cons[fg_console].d;
-    /*
-     *  Power down if currently suspended (1 or 2),
-     *  suspend if currently blanked (0),
-     *  else do nothing (i.e. already powered down (3)).
-     *  Called only if powerdown features are allowed.
-     */
-    switch (vesa_blank_mode) {
-    case VESA_NO_BLANKING:
-	    c->vc_sw->con_blank(c, VESA_VSYNC_SUSPEND+1, 0);
-	    break;
-    case VESA_VSYNC_SUSPEND:
-    case VESA_HSYNC_SUSPEND:
-	    c->vc_sw->con_blank(c, VESA_POWERDOWN+1, 0);
-	    break;
-    }
-}
-
 void do_blank_screen(int entering_gfx)
 {
 	struct vc_data *vc = vc_cons[fg_console].d;
@@ -2765,8 +2768,7 @@ void do_blank_screen(int entering_gfx)
 	if (console_blanked) {
 		if (blank_state == blank_vesa_wait) {
 			blank_state = blank_off;
-			vesa_powerdown();
-
+			vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
 		}
 		return;
 	}
@@ -2796,7 +2798,7 @@ void do_blank_screen(int entering_gfx)
 
 	save_screen(vc);
 	/* In case we need to reset origin, blanking hook returns 1 */
-	i = vc->vc_sw->con_blank(vc, 1, 0);
+	i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
 	console_blanked = fg_console + 1;
 	if (i)
 		set_origin(vc);
@@ -2804,13 +2806,10 @@ void do_blank_screen(int entering_gfx)
 	if (console_blank_hook && console_blank_hook(1))
 		return;
 
-	if (vesa_off_interval) {
+	if (vesa_off_interval && vesa_blank_mode) {
 		blank_state = blank_vesa_wait;
 		mod_timer(&console_timer, jiffies + vesa_off_interval);
 	}
-
-    	if (vesa_blank_mode)
-		vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
 }
 EXPORT_SYMBOL(do_blank_screen);
 
@@ -2870,9 +2869,9 @@ void unblank_screen(void)
 }
 
 /*
- * We defer the timer blanking to work queue so it can take the console semaphore
+ * We defer the timer blanking to work queue so it can take the console mutex
  * (console operations can still happen at irq time, but only from printk which
- * has the console semaphore. Not perfect yet, but better than no locking
+ * has the console mutex. Not perfect yet, but better than no locking
  */
 static void blank_screen_t(unsigned long dummy)
 {
@@ -3214,6 +3213,7 @@ void getconsxy(struct vc_data *vc, unsigned char *p)
 
 void putconsxy(struct vc_data *vc, unsigned char *p)
 {
+	hide_cursor(vc);
 	gotoxy(vc, p[0], p[1]);
 	set_cursor(vc);
 }
@@ -3234,6 +3234,14 @@ void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
 	}
 }
 
+int is_console_suspend_safe(void)
+{
+	/* It is unsafe to suspend devices while X has control of the
+	 * hardware. Make sure we are running on a kernel-controlled console.
+	 */
+	return vc_cons[fg_console].d->vc_mode == KD_TEXT;
+}
+
 /*
  *	Visible symbols for modules
  */