In the current implementation we take the first console that
registers if we didn't select one.
But if we specify console via "stdout-path" property in device tree
we don't want first console that registers here to be selected.
Otherwise we may choose wrong console - for example if some console
is registered earlier than console is pointed in "stdout-path"
property because console pointed in "stdout-path" property can be add as
preferred quite late - when it's driver is probed.
Signed-off-by: Eugeniy Paltsev <eugeniy.palt...@synopsys.com>
---
kernel/printk/printk.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 512f7c2..23262c1 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -26,6 +26,7 @@
#include <linux/nmi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/of.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/security.h>
@@ -2431,6 +2432,16 @@ void register_console(struct console *newcon)
if (!has_preferred || bcon || !console_drivers)
has_preferred = preferred_console >= 0;
+
+ /*
+ * If we specify console via "stdout-path" property in device tree
+ * we don't want first console that registers here to be selected.
+ */
+#ifdef CONFIG_OF
+ if (of_stdout)
+ has_preferred = true;
+#endif
+
/*
* See if we want to use this console driver. If we
* didn't select a console we take the first one
--
2.9.3
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