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vfb: only enable if explicitly requested when compiled in

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The Kconfig help for the vfb driver says:
   Do NOT enable it for normal systems! To protect the innocent, it
   has to be enabled explicitly at boot time using the kernel option
   `video=vfb:'.

This change lets the code match the description.

Support for vfb:disable is kept for backwards compatibility; vfb:off works
because it is tested at a higher level.

Note: any undefined option (e.g. vfb:enable) will also enable this driver.

The relevant code has been unchanged since before the migration to
git (2.6.12).

This patch fixes bugzilla #9310 and was the root cause behind
http://lkml.org/lkml/2008/5/31/220.

Signed-off-by: Frans Pop <elendil@planet.nl>
Cc: Antonino A. Daplas <adaplas@gmail.com>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Frans Pop 2008-07-23 21:31:26 -07:00 committed by Linus Torvalds
parent cfb4f5d175
commit b604838ac6
1 changed files with 12 additions and 2 deletions
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14
drivers/video/vfb.c
View file

@ -443,19 +443,29 @@ static int vfb_mmap(struct fb_info *info,
}
#ifndef MODULE
/*
* The virtual framebuffer driver is only enabled if explicitly
* requested by passing 'video=vfb:' (or any actual options).
*/
static int __init vfb_setup(char *options)
{
char *this_opt;
vfb_enable = 0;
if (!options)
return 1;
vfb_enable = 1;
if (!options || !*options)
if (!*options)
return 1;
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt)
continue;
if (!strncmp(this_opt, "disable", 7))
/* Test disable for backwards compatibility */
if (!strcmp(this_opt, "disable"))
vfb_enable = 0;
}
return 1;