[Kgdb-bugreport] [PATCH printk v2 26/38] kdb: use srcu console list iterator

[John Ogness]

Guarantee safe iteration of the console list by using SRCU.

Signed-off-by: John Ogness <john.ogn...@linutronix.de>
---
 kernel/debug/kdb/kdb_io.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 550fe8b456ec..5c0bd93c3574 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -545,6 +545,7 @@ static void kdb_msg_write(const char *msg, int msg_len)
 {
        struct console *c;
        const char *cp;
+       int cookie;
        int len;
 
        if (msg_len == 0)
@@ -558,7 +559,8 @@ static void kdb_msg_write(const char *msg, int msg_len)
                cp++;
        }
 
-       for_each_console(c) {
+       cookie = console_srcu_read_lock();
+       for_each_console_srcu(c) {
                if (!console_is_enabled(c))
                        continue;
                if (c == dbg_io_ops->cons)
@@ -577,6 +579,7 @@ static void kdb_msg_write(const char *msg, int msg_len)
                --oops_in_progress;
                touch_nmi_watchdog();
        }
+       console_srcu_read_unlock(cookie);
 }
 
 int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
-- 
2.30.2



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