Commit d1baa4ff authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
Browse files

fbcon: set_con2fb_map fixes 



set_con2fb_map() has regressed for some time.  Using fbcon=map:01, for
example, works only if there is only 1 working framebuffer. Trying to do a
set_con2fb_map() on a non-allocated vc will freeze the system.

- ensure that succeeding drivers after the first gets mapped to the console
- remove fbcon_preset_display() and modify fbcon_set_display() to include the
  former's functionality
- ensure that binding and unbinding succeeds if multiple drivers are mapped to
  the console

Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2f7bb99f

drivers/video/console/fbcon.c

+25 −39
Original line number Diff line number Diff line
@@ -192,8 +192,6 @@ static __inline__ void ypan_down(struct vc_data *vc, int count); 
static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,

			    int dy, int dx, int height, int width, u_int y_break);

static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,

			   struct vc_data *vc);

static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,

			   int unit);

static void fbcon_redraw_move(struct vc_data *vc, struct display *p,

			      int line, int count, int dy);
@@ -745,6 +743,8 @@ static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info, 


	if (!err) {

		info->fbcon_par = ops;



		if (vc)

			set_blitting_type(vc, info);

	}
@@ -807,11 +807,7 @@ static void con2fb_init_display(struct vc_data *vc, struct fb_info *info, 


	ops->flags |= FBCON_FLAGS_INIT;

	ops->graphics = 0;



	if (vc)

		fbcon_set_disp(info, &info->var, vc);

	else

		fbcon_preset_disp(info, &info->var, unit);

	fbcon_set_disp(info, &info->var, unit);



	if (show_logo) {

		struct vc_data *fg_vc = vc_cons[fg_console].d;
@@ -1116,6 +1112,9 @@ static void fbcon_init(struct vc_data *vc, int init) 
	if (var_to_display(p, &info->var, info))

		return;



	if (!info->fbcon_par)

		con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);



	/* If we are not the first console on this

	   fb, copy the font from that console */

	t = &fb_display[fg_console];
@@ -1382,36 +1381,29 @@ static int scrollback_phys_max = 0; 
static int scrollback_max = 0;

static int scrollback_current = 0;



/*

 * If no vc is existent yet, just set struct display

 */

static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,

static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,

			   int unit)

{

	struct display *p = &fb_display[unit];

	struct display *t = &fb_display[fg_console];

	struct display *p, *t;

	struct vc_data **default_mode, *vc;

	struct vc_data *svc;

	struct fbcon_ops *ops = info->fbcon_par;

	int rows, cols, charcnt = 256;



	p = &fb_display[unit];



	if (var_to_display(p, var, info))

		return;



	p->fontdata = t->fontdata;

	p->userfont = t->userfont;

	if (p->userfont)

		REFCOUNT(p->fontdata)++;

}



static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,

			   struct vc_data *vc)

{

	struct display *p = &fb_display[vc->vc_num], *t;

	struct vc_data **default_mode = vc->vc_display_fg;

	struct vc_data *svc = *default_mode;

	struct fbcon_ops *ops = info->fbcon_par;

	int rows, cols, charcnt = 256;

	vc = vc_cons[unit].d;



	if (var_to_display(p, var, info))

	if (!vc)

		return;



	default_mode = vc->vc_display_fg;

	svc = *default_mode;

	t = &fb_display[svc->vc_num];



	if (!vc->vc_font.data) {

		vc->vc_font.data = (void *)(p->fontdata = t->fontdata);

		vc->vc_font.width = (*default_mode)->vc_font.width;
@@ -3118,8 +3110,7 @@ static int fbcon_fb_registered(struct fb_info *info) 
			ret = fbcon_takeover(1);

	} else {

		for (i = first_fb_vc; i <= last_fb_vc; i++) {

			if (con2fb_map_boot[i] == idx &&

			    con2fb_map[i] == -1)

			if (con2fb_map_boot[i] == idx)

				set_con2fb_map(i, idx, 0);

		}

	}
@@ -3167,12 +3158,7 @@ static void fbcon_new_modelist(struct fb_info *info) 
		mode = fb_find_nearest_mode(fb_display[i].mode,

					    &info->modelist);

		fb_videomode_to_var(&var, mode);



		if (vc)

			fbcon_set_disp(info, &var, vc);

		else

			fbcon_preset_disp(info, &var, i);



		fbcon_set_disp(info, &var, vc->vc_num);

	}

}

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