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| author | Daniel Thompson <daniel.thompson@linaro.org> | 2014-05-29 09:48:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-29 11:28:05 -0700 |
| commit | bd71a1c08807966636daf52138119108c12c6061 (patch) | |
| tree | 461fa928de53a33c90e6c05e6b10c10d406c4daf | |
| parent | 8a0ff60f7eeab3df34d475c952b9d75799de8975 (diff) | |
| download | blackbird-op-linux-bd71a1c08807966636daf52138119108c12c6061.tar.gz blackbird-op-linux-bd71a1c08807966636daf52138119108c12c6061.zip | |
serial: kgdb_nmi: Improve console integration with KDB I/O
kgdb_nmi_tty_enabled is used for two unrelated purposes, namely to
suppress normal TTY input handling and to suppress console output
(although it has no effect at all on TTY output). A much better way to
handle muting the console is to not have to mute it in the first place!
That's what this patch does.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/kgdb_nmi.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c index 20d21d09ee86..cfadf2971b12 100644 --- a/drivers/tty/serial/kgdb_nmi.c +++ b/drivers/tty/serial/kgdb_nmi.c @@ -44,13 +44,22 @@ MODULE_PARM_DESC(magic, "magic sequence to enter NMI debugger (default $3#33)"); static bool kgdb_nmi_tty_enabled; +static int kgdb_nmi_console_setup(struct console *co, char *options) +{ + /* The NMI console uses the dbg_io_ops to issue console messages. To + * avoid duplicate messages during kdb sessions we must inform kdb's + * I/O utilities that messages sent to the console will automatically + * be displayed on the dbg_io. + */ + dbg_io_ops->is_console = true; + + return 0; +} + static void kgdb_nmi_console_write(struct console *co, const char *s, uint c) { int i; - if (!kgdb_nmi_tty_enabled || atomic_read(&kgdb_active) >= 0) - return; - for (i = 0; i < c; i++) dbg_io_ops->write_char(s[i]); } @@ -65,6 +74,7 @@ static struct tty_driver *kgdb_nmi_console_device(struct console *co, int *idx) static struct console kgdb_nmi_console = { .name = "ttyNMI", + .setup = kgdb_nmi_console_setup, .write = kgdb_nmi_console_write, .device = kgdb_nmi_console_device, .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED, |
