vt: make vt_console_print() compatible with the unicode screen buffer

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commit 6609cff65c upstream.

When kernel messages are printed to the console, they appear blank on
the unicode screen. This is because vt_console_print() is lacking a call
to vc_uniscr_putc(). However the later function assumes vc->vc_x is
always up to date when called, which is not the case here as
vt_console_print() uses it to mark the beginning of the display update.

This patch reworks (and simplifies) vt_console_print() so that vc->vc_x
is always valid and keeps the start of display update in a local variable
instead, which finally allows for adding the missing vc_uniscr_putc()
call.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Nicolas Pitre 2019-01-08 22:54:59 -05:00 • committed by Greg Kroah-Hartman

parent 44486b29b8

commit 082ea9f687

1 changed files with 15 additions and 32 deletions

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drivers/tty/vt/vt.c

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