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authorDaniel Thompson <daniel.thompson@linaro.org>2014-05-29 09:48:46 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-29 11:28:05 -0700
commitbd71a1c08807966636daf52138119108c12c6061 (patch)
tree461fa928de53a33c90e6c05e6b10c10d406c4daf /drivers/tty
parent8a0ff60f7eeab3df34d475c952b9d75799de8975 (diff)
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/kgdb_nmi.c16
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,