From f0c7d2b72ad1a694c0c886a14cc708841181e9bd Mon Sep 17 00:00:00 2001 From: Francisco Jerez Date: Tue, 22 Sep 2009 16:47:53 -0700 Subject: vgacon: prevent vgacon_deinit from touching the hardware for inactive consoles. fbcon makes the (reasonable) assumption that it only needs to program the hardware once, when fbcon_init() is called for the foreground console. This doesn't always play well with vgacon because vgacon_deinit() is only doing its job when the last console it owns is closed (when switching from vgacon to fbcon, that's usually *after* fbcon_init() has set the new mode). Depending on the hardware this can cause the wrong framebuffer location to be scanned out (e.g. reproduced on nv05 with the nouveau framebuffer driver). Signed-off-by: Francisco Jerez Cc: "H. Peter Anvin" Cc: Alan Cox Cc: Krzysztof Helt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/console/vgacon.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers/video') diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 74e96cf83b7..da55ccaf4d5 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -589,12 +589,14 @@ static void vgacon_init(struct vc_data *c, int init) static void vgacon_deinit(struct vc_data *c) { - /* When closing the last console, reset video origin */ - if (!--vgacon_uni_pagedir[1]) { + /* When closing the active console, reset video origin */ + if (CON_IS_VISIBLE(c)) { c->vc_visible_origin = vga_vram_base; vga_set_mem_top(c); - con_free_unimap(c); } + + if (!--vgacon_uni_pagedir[1]) + con_free_unimap(c); c->vc_uni_pagedir_loc = &c->vc_uni_pagedir; con_set_default_unimap(c); } -- cgit v1.2.3-70-g09d2