[PATCH 2/3] drivers/class: Add Legacy PM OPS usage check and warning to __class_register()

[Shuah Khan]

Add Legacy PM OPS usage checks to __class_register() function. If Legacy PM OPS
usage is found, print warning message to indicate the driver code needs
updating to use Dev PM OPS interfaces. This will help serve as a way to track
drivers that still use Legacy PM OPS and fix them.

The Legacy PM OPS check looks for suspend(struct device *, pm_message_t) or
resume(struct device *) class level interfaces.

Signed-off-by: Shuah Khan <shuah.kh@xxxxxxxxxxx>
---
 drivers/base/class.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 8b7818b..f26a3f2 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -180,6 +180,10 @@ int __class_register(struct class *cls, struct lock_class_key *key)
 
 	pr_debug("device class '%s': registering\n", cls->name);
 
+	if (cls->suspend || cls->resume)
+		pr_warn("device class '%s': Please update to use dev pm ops\n",
+			cls->name);
+
 	cp = kzalloc(sizeof(*cp), GFP_KERNEL);
 	if (!cp)
 		return -ENOMEM;
-- 
1.8.3.2

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