Patch "PM / OPP: Move error message to debug level" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

PM / OPP: Move error message to debug level

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
pm-opp-move-error-message-to-debug-level.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Fabio Estevam <[email protected]>
Date: Fri, 29 Sep 2017 14:39:49 -0300
Subject: PM / OPP: Move error message to debug level

From: Fabio Estevam <[email protected]>

[ Upstream commit 035ed07208dc501d023873447113f3f178592156 ]

On some i.MX6 platforms which do not have speed grading check, opp table will not be created in platform code, so cpufreq driver prints the following error message:

cpu cpu0: dev_pm_opp_get_opp_count: OPP table not found (-19)

However, this is not really an error in this case because the imx6q-cpufreq driver first calls dev_pm_opp_get_opp_count() and if it fails, it means that platform code does not provide OPP and then dev_pm_opp_of_add_table() will be called.

In order to avoid such confusing error message, move it to debug level.

It is up to the caller of dev_pm_opp_get_opp_count() to check its return value and decide if it will print an error or not.

---
 drivers/base/power/opp/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -331,7 +331,7 @@ int dev_pm_opp_get_opp_count(struct devi
 	opp_table = _find_opp_table(dev);
 	if (IS_ERR(opp_table)) {
 		count = PTR_ERR(opp_table);
-		dev_err(dev, "%s: OPP table not found (%d)\n",
+		dev_dbg(dev, "%s: OPP table not found (%d)\n",
 			__func__, count);
 		goto out_unlock;
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/pm-opp-move-error-message-to-debug-level.patch