On (04/25/19 14:19), Sergey Senozhatsky wrote:
> 
> So may be we can move the whole thing under console_sem.
> 

Something like below. I'll re-spin the series in a day or two,
we have time.

---
 kernel/printk/printk.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 52d1123d9fdc..0c2eb161e793 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2666,7 +2666,7 @@ static int __unregister_console(struct console *console)
  *  - Once a "real" console is registered, any attempt to register a
  *    bootconsoles will be rejected
  */
-void register_console(struct console *newcon)
+static void __register_console(struct console *newcon)
 {
        int i;
        unsigned long flags;
@@ -2771,7 +2771,6 @@ void register_console(struct console *newcon)
         *      Put this console in the list - keep the
         *      preferred driver at the head of the list.
         */
-       console_lock();
        if ((newcon->flags & CON_CONSDEV) || console_drivers == NULL) {
                newcon->next = console_drivers;
                console_drivers = newcon;
@@ -2820,19 +2819,25 @@ void register_console(struct console *newcon)
 
        console_unlock();
        console_sysfs_notify();
+       console_lock();
 
        if (keep_bootcon)
                return;
 
        if (bcon && (newcon->flags & (CON_CONSDEV|CON_BOOT)) == CON_CONSDEV) {
-               console_lock();
                for_each_console(bcon)
                        if (bcon->flags & CON_BOOT)
                                __unregister_console(bcon);
-               console_unlock();
-               console_sysfs_notify();
        }
 }
+
+void register_console(struct console *newcon)
+{
+       console_lock();
+       __register_console(newcon);
+       console_unlock();
+       console_sysfs_notify();
+}
 EXPORT_SYMBOL(register_console);
 
 int unregister_console(struct console *console)
-- 
2.21.0

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