On 18/10/16 17:15, Jiri Slaby wrote:
On 06/21/2016, 05:19 PM, Matthew Leach wrote:
When using the 8250 as a boot console and the main console results in
messages being printed twice.  The console framework will only
unregister boot consoles if a new console is registered with the
CON_CONSDEV flag set.

Set this flag for the univ8250 console to prevent double-registration.

Signed-off-by: Matthew Leach <matthew.le...@codethink.co.uk>
 drivers/tty/serial/8250/8250_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_core.c 
index 2f4f5ee..7a7453d 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -675,7 +675,7 @@ static struct console univ8250_console = {
        .device         = uart_console_device,
        .setup          = univ8250_console_setup,
        .match          = univ8250_console_match,
-       .flags          = CON_PRINTBUFFER | CON_ANYTIME,
+       .flags          = CON_PRINTBUFFER | CON_ANYTIME | CON_CONSDEV,

This patch breaks console= parameter handling. Passing:
  console=ttyS0 console=tty0
no longer means /dev/console is tty0 and it should be as is documented.

I have not investigated further yet.

Ok, thanks.
I'll need to find Matthew Leach's new address as he's moved jobs.

Ben Dooks                               http://www.codethink.co.uk/
Senior Engineer                         Codethink - Providing Genius

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