linux-kernel - [PATCH] PM / wakeup: Skip wakeup_source_sysfs

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Date:   Mon, 23 Mar 2020 10:38:51 +0530
From:   Neeraj Upadhyay <neeraju@...eaurora.org>
To:     rjw@...ysocki.net, pavel@....cz, len.brown@...el.com,
        gregkh@...uxfoundation.org, swboyd@...omium.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        irgeorgiev@...eaurora.org, linux-arm-msm@...r.kernel.org,
        Neeraj Upadhyay <neeraju@...eaurora.org>
Subject: [PATCH] PM / wakeup: Skip wakeup_source_sysfs_remove if device is not added

Skip wakeup_source_sysfs_remove(), to fix null pinter access of
ws->dev, if wakeup source is unregistered before wakeup class
is registered from device_add().

Fixes: 2ca3d1ecb8c4 ("PM / wakeup: Register wakeup class kobj after device is added")
Signed-off-by: Neeraj Upadhyay <neeraju@...eaurora.org>
---
 drivers/base/power/wakeup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 27f3e60..f8f8c0a 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -241,7 +241,8 @@ void wakeup_source_unregister(struct wakeup_source *ws)
 {
 	if (ws) {
 		wakeup_source_remove(ws);
-		wakeup_source_sysfs_remove(ws);
+		if (ws->dev)
+			wakeup_source_sysfs_remove(ws);
 		wakeup_source_destroy(ws);
 	}
 }
-- 
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