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vt: do not update when the console is blanked 

vt.c DO_UPDATE macro checks if the console is visible but doesn't check if
the console is blanked.

In fact updating fbcon while the console is blanked is not only
unnecessary but can even cause screen corruption.

Therefore I am adding a simple check on console_blanked in DO_UPDATE.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefano Stabellini 2008-07-23 21:29:59 -07:00 committed by Linus Torvalds
parent e0426e6a09
commit f700d6e5e5
1 changed files with 1 additions and 1 deletions
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2
drivers/char/vt.c
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@ -261,7 +261,7 @@ static void notify_update(struct vc_data *vc)
#ifdef VT_BUF_VRAM_ONLY
#define DO_UPDATE(vc) 0
#else
#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
#endif
static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)