[VIDEO] vfb: only enable if explicitly requested when compiled in
From: Frans Pop <hidden>
Date: 2008-06-01 12:54:36
From: Frans Pop <redacted>
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.
Signed-off-by: Frans Pop <redacted>
CC: Antonino A. Daplas <adaplas@gmail.com>
CC: Andrew Morton <akpm@linux-foundation.org>
---
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.
My confusion stemmed from the fact that I was still assuming that the
Kconfig help would be correct (even though Antonino had already
determined it was not: http://lkml.org/lkml/2007/10/14/25, but somehow
my brain never parsed that).
diff --git a/drivers/video/vfb.c b/drivers/video/vfb.c
index 072638a..51e935f 100644
--- a/drivers/video/vfb.c
+++ b/drivers/video/vfb.c@@ -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 = 1; + vfb_enable = 0; - if (!options || !*options) + if (!options) + return 1; + + vfb_enable = 1; + + 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; -------------------------------------------------------------------------
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