linux-kernel - [PATCH v3 2/4] kdb: Check status of console prior to invoking handlers

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Date:   Wed, 27 May 2020 11:55:57 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     daniel.thompson@...aro.org
Cc:     kgdb-bugreport@...ts.sourceforge.net, jason.wessel@...driver.com,
        dianders@...omium.org, pmladek@...e.com,
        sergey.senozhatsky@...il.com, linux-kernel@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>
Subject: [PATCH v3 2/4] kdb: Check status of console prior to invoking handlers

Check if a console is enabled prior to invoking corresponding write
handler.

Suggested-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
---
 kernel/debug/kdb/kdb_io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index f6b4d47..349dfcc 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -564,6 +564,8 @@ static void kdb_msg_write(char *msg, int msg_len)
 		kdb_io_write(msg, msg_len, dbg_io_ops->write_char);
 
 	for_each_console(c) {
+		if (!(c->flags & CON_ENABLED))
+			continue;
 		c->write(c, msg, msg_len);
 		touch_nmi_watchdog();
 	}
-- 
2.7.4