[PATCH 3/3] driver: Add Legacy PM OPS usage check and warning to driver_register()

[Shuah Khan]

Add Legacy PM OPS usage checks to driver_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 *) struct device_driver interfaces.

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

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 9e29943..10ff280 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -157,6 +157,10 @@ int driver_register(struct device_driver *drv)
 		printk(KERN_WARNING "Driver '%s' needs updating - please use "
 			"bus_type methods\n", drv->name);
 
+	if (drv->suspend || drv->resume)
+		pr_warn("Please update driver '%s' to use dev pm ops.\n",
+			drv->name);
+
 	other = driver_find(drv->name, drv->bus);
 	if (other) {
 		printk(KERN_ERR "Error: Driver '%s' is already registered, "
-- 
1.8.3.2

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