[PATCH 1/3] drivers/bus: Add Legacy PM OPS usage check and warning to bus_register()

[Shuah Khan]

Add Legacy PM OPS usage checks to bus_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 *) bus level interfaces.

Signed-off-by: Shuah Khan <shuah.kh@xxxxxxxxxxx>
---
 drivers/base/bus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 4c289ab..9e68453 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -991,6 +991,9 @@ int bus_register(struct bus_type *bus)
 		goto bus_groups_fail;
 
 	pr_debug("bus: '%s': registered\n", bus->name);
+	if (bus->suspend || bus->resume)
+		pr_warn("bus '%s': Please update to use dev pm ops.\n",
+			bus->name);
 	return 0;
 
 bus_groups_fail:
-- 
1.8.3.2

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