syscore: Pass context data to callbacks

Several drivers can benefit from registering per-instance data along
with the syscore operations. To achieve this, move the modifiable fields
out of the syscore_ops structure and into a separate struct syscore that
can be registered with the framework. Add a void * driver data field for
drivers to store contextual data that will be passed to the syscore ops.

Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 5aee9ffb16b9..f852dce94015 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3639,12 +3639,13 @@ static bool legacy_kthread_create(void)
 
 /**
  * printk_kthreads_shutdown - shutdown all threaded printers
+ * @data: syscore context
  *
  * On system shutdown all threaded printers are stopped. This allows printk
  * to transition back to atomic printing, thus providing a robust mechanism
  * for the final shutdown/reboot messages to be output.
  */
-static void printk_kthreads_shutdown(void)
+static void printk_kthreads_shutdown(void *data)
 {
 	struct console *con;
 
@@ -3666,10 +3667,14 @@ static void printk_kthreads_shutdown(void)
 	console_list_unlock();
 }
 
-static struct syscore_ops printk_syscore_ops = {
+static const struct syscore_ops printk_syscore_ops = {
 	.shutdown = printk_kthreads_shutdown,
 };
 
+static struct syscore printk_syscore = {
+	.ops = &printk_syscore_ops,
+};
+
 /*
  * If appropriate, start nbcon kthreads and set @printk_kthreads_running.
  * If any kthreads fail to start, those consoles are unregistered.
@@ -3737,7 +3742,7 @@ static void printk_kthreads_check_locked(void)
 
 static int __init printk_set_kthreads_ready(void)
 {
-	register_syscore_ops(&printk_syscore_ops);
+	register_syscore(&printk_syscore);
 
 	console_list_lock();
 	printk_kthreads_ready = true;