vt: regression caused by "Fix line garbage in virtual.."

[Krzysztof Mazur]

Hi,

commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c
(tty vt: Fix line garbage in virtual console on command line edition)
introduced some regression in deleting characters/clearing line during
selecting previous command in bash by using "up" arrow.


The problem can be reproduced by two following commands:

echo -n "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
echo -e "\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x1b\x5b\x33\x50\x64\x72\x69\x76\x65\x72\x73\x2f\x69\x6e\x70\x75\x74\x2f\x6d\x6f\x75\x73\x65\x64\x65\x76\x2e\x63"

(the first command generates just some garbage, the second command
generates string captured by strace when the issue occured).


On Linux v3.6 the resulting line is:

...AAAdrivers/input/mousedev.c

with fbcon on inteldrmfb and v3.7-rc6
...AAAdrivers/input/mousedev.c  A

with fbcon on radeondrmfb and v3.7-rc6
...AAAdrivers/input/mousedev.cAAA


There are some garbage after mousedev.c not present on older kernels.

Reverting commit 81732c in v3.7-rc6 fixes the issue.

Krzysiek
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