Two bugs in fbcon?

[Ondrej Zajicek <santiago@mail.cz>]

(i resent this email as previous one seems to be lost, so i am sorry
in case you get both ones)

Hello

I found that in  kernel 2.6.16.16 is some very strange behavior in fbcon.
I added some printks to some functions in fbcon and i found this:

I am on vt0, i have active vt0-vt3. When i modprobe fbcon (having fbdev
driver inserted before), functions fbcon.c/fbcon_init() and
fbcon.c/updatescrollmode() are called for each active vt.

Order is:
fbcon_init(vt0)
updatescrollmode(vt0)
updatescrollmode(vt1)
fbcon_init(vt1)
updatescrollmode(vt2)
fbcon_init(vt2)
updatescrollmode(vt3)
fbcon_init(vt3)

for vt1-vt3 updatescrollmode is called before fbcon_init which caused that
associated struct display::vrows value is computed (in updatescrollmode()
- fbcon.c:1970) from old vc->vc_rows (which is updated in fbcon_init()).

Now second strangeness - I am still on vt0 (immediately after modprobe
fbcon), but during calls to bitblit.c/bit_cursor() display structure
associated with vt3 is used (in bitblit.c:244 - ops->p). Combined with
previous strangeness (bad vrows values in vt1-vt3) i get cursor visible
on bad row.

When i switch to another vt or switch resolution, then this is corrected
(next calls to bitblit.c/bit_cursor() are using correct display
structure).

I don't understand fbcon enough to correct this problem (and be sure not to
make some other :-)).


-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago@mail.cz, jabber: santiago@njs.netlab.cz)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."


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