[dpdk-stable] patch 'power: do not skip saving original P-state governor' has been queued to stable release 19.11.9

[Christian Ehrhardt]

Hi,

FYI, your patch has been queued to stable release 19.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/19/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/cpaelzer/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/cpaelzer/dpdk-stable-queue/commit/500cef51e15ace6e16f628e4c98f37043f9907d3

Thanks.

Christian Ehrhardt <christian.ehrhardt at canonical.com>

---
>From 500cef51e15ace6e16f628e4c98f37043f9907d3 Mon Sep 17 00:00:00 2001
From: Anatoly Burakov <anatoly.burakov at intel.com>
Date: Fri, 2 Apr 2021 09:26:45 +0000
Subject: [PATCH] power: do not skip saving original P-state governor

[ upstream commit 190f38773acffc5cc822f4347b38ce04257cd044 ]

Currently, when we set the pstate governor to "performance", we check if
it is already set to this value, and if it is, we skip setting it.

However, we never save this value anywhere, so that next time we come
back and request the governor to be set to its original value, the
original value is empty.

Fix it by saving the original pstate governor first. While we're at it,
replace `strlcpy` with `rte_strscpy`.

Fixes: e6c6dc0f96c8 ("power: add p-state driver compatibility")

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
Acked-by: Reshma Pattan <reshma.pattan at intel.com>
---
 lib/librte_power/power_pstate_cpufreq.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/librte_power/power_pstate_cpufreq.c b/lib/librte_power/power_pstate_cpufreq.c
index fa16b44146..103c5375e9 100644
--- a/lib/librte_power/power_pstate_cpufreq.c
+++ b/lib/librte_power/power_pstate_cpufreq.c
@@ -350,6 +350,9 @@ power_set_governor_performance(struct pstate_power_info *pi)
 	/* Strip off terminating '\n' */
 	strtok(buf, "\n");
 
+	/* Save the original governor */
+	rte_strscpy(pi->governor_ori, buf, sizeof(pi->governor_ori));
+
 	/* Check if current governor is performance */
 	if (strncmp(buf, POWER_GOVERNOR_PERF,
 			sizeof(POWER_GOVERNOR_PERF)) == 0) {
@@ -358,8 +361,6 @@ power_set_governor_performance(struct pstate_power_info *pi)
 				"already performance\n", pi->lcore_id);
 		goto out;
 	}
-	/* Save the original governor */
-	strlcpy(pi->governor_ori, buf, sizeof(pi->governor_ori));
 
 	/* Write 'performance' to the governor */
 	val = fseek(f, 0, SEEK_SET);
-- 
2.31.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-05-17 17:40:32.557947750 +0200
+++ 0078-power-do-not-skip-saving-original-P-state-governor.patch	2021-05-17 17:40:29.243810043 +0200
@@ -1 +1 @@
-From 190f38773acffc5cc822f4347b38ce04257cd044 Mon Sep 17 00:00:00 2001
+From 500cef51e15ace6e16f628e4c98f37043f9907d3 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 190f38773acffc5cc822f4347b38ce04257cd044 ]
+
@@ -17 +18,0 @@
-Cc: stable at dpdk.org
@@ -26 +27 @@
-index c4639e4b8a..1cb0e4d917 100644
+index fa16b44146..103c5375e9 100644
@@ -29 +30 @@
-@@ -382,6 +382,9 @@ power_set_governor_performance(struct pstate_power_info *pi)
+@@ -350,6 +350,9 @@ power_set_governor_performance(struct pstate_power_info *pi)
@@ -39 +40 @@
-@@ -390,8 +393,6 @@ power_set_governor_performance(struct pstate_power_info *pi)
+@@ -358,8 +361,6 @@ power_set_governor_performance(struct pstate_power_info *pi)