[PATCH 5.10.y 1/2] ipmi:ssif: Fix a shutdown race

[Corey Minyard <corey@minyard.net>]

It was possible for the SSIF thread to stop and quit before the
kthread_stop() call because ssif->stopping was set before the
stop.  So only exit the SSIF thread is kthread_should_stop()
returns true.

There is no need to wake the thread, as the wait will be interrupted
by kthread_stop().

Signed-off-by: Corey Minyard <cminyard@mvista.com>
(cherry picked from commit 6bd0eb6d759b9a22c5509ea04e19c2e8407ba418)
---
 drivers/char/ipmi/ipmi_ssif.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index 30f757249c5c..22074f23c06a 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -487,8 +487,6 @@ static int ipmi_ssif_thread(void *data)
 		/* Wait for something to do */
 		result = wait_for_completion_interruptible(
 						&ssif_info->wake_thread);
-		if (ssif_info->stopping)
-			break;
 		if (result == -ERESTARTSYS)
 			continue;
 		init_completion(&ssif_info->wake_thread);
@@ -1279,10 +1277,8 @@ static void shutdown_ssif(void *send_info)
 	ssif_info->stopping = true;
 	del_timer_sync(&ssif_info->watch_timer);
 	del_timer_sync(&ssif_info->retry_timer);
-	if (ssif_info->thread) {
-		complete(&ssif_info->wake_thread);
+	if (ssif_info->thread)
 		kthread_stop(ssif_info->thread);
-	}
 }
 
 static int ssif_remove(struct i2c_client *client)
-- 
2.43.0