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| author | Francisco Jerez <currojerez@riseup.net> | 2009-09-22 16:47:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:57 -0700 |
| commit | f0c7d2b72ad1a694c0c886a14cc708841181e9bd (patch) | |
| tree | 4c843c53762352136f4cefd99b8f2f56a4b63d03 | |
| parent | 2ddce3fd0acbdc1be684fb5f919ae3d2e9518aac (diff) | |
| download | linux-stable-f0c7d2b72ad1a694c0c886a14cc708841181e9bd.tar.gz linux-stable-f0c7d2b72ad1a694c0c886a14cc708841181e9bd.tar.bz2 linux-stable-f0c7d2b72ad1a694c0c886a14cc708841181e9bd.zip | |
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 <currojerez@riseup.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/video/console/vgacon.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 74e96cf83b7e..da55ccaf4d55 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); } |