netdev - [PATCH net-next v3 2/7] devlink: Rework devlink health reporter destructor

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Message-Id: <1594383913-3295-3-git-send-email-moshe@mellanox.com>
Date:   Fri, 10 Jul 2020 15:25:08 +0300
From:   Moshe Shemesh <moshe@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vladyslav Tarasiuk <vladyslavt@...lanox.com>
Subject: [PATCH net-next v3 2/7] devlink: Rework devlink health reporter destructor

From: Vladyslav Tarasiuk <vladyslavt@...lanox.com>

Devlink keeps its own reference to every reporter in a list and inits
refcount to 1 upon reporter's creation. Existing destructor waits to
free the memory indefinitely using msleep() until all references except
devlink's own are put.

Rework this mechanism by moving memory free routine to a separate
function, which is called when the last reporter reference is put.

Besides, it allows to call __devlink_health_reporter_destroy() while
locked on a reporters list mutex in symmetry to
__devlink_health_reporter_create(), which is required in follow-up
patch.

Signed-off-by: Vladyslav Tarasiuk <vladyslavt@...lanox.com>
Reviewed-by: Moshe Shemesh <moshe@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
---
 net/core/devlink.c | 37 ++++++++++++++++++++++++-------------
 1 file changed, 24 insertions(+), 13 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index a203d35..b85f211 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -5379,6 +5379,29 @@ struct devlink_health_reporter *
 }
 EXPORT_SYMBOL_GPL(devlink_health_reporter_create);
 
+static void
+devlink_health_reporter_free(struct devlink_health_reporter *reporter)
+{
+	mutex_destroy(&reporter->dump_lock);
+	if (reporter->dump_fmsg)
+		devlink_fmsg_free(reporter->dump_fmsg);
+	kfree(reporter);
+}
+
+static void
+devlink_health_reporter_put(struct devlink_health_reporter *reporter)
+{
+	if (refcount_dec_and_test(&reporter->refcount))
+		devlink_health_reporter_free(reporter);
+}
+
+static void
+__devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
+{
+	list_del(&reporter->list);
+	devlink_health_reporter_put(reporter);
+}
+
 /**
  *	devlink_health_reporter_destroy - destroy devlink health reporter
  *
@@ -5388,14 +5411,8 @@ struct devlink_health_reporter *
 devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
 {
 	mutex_lock(&reporter->devlink->reporters_lock);
-	list_del(&reporter->list);
+	__devlink_health_reporter_destroy(reporter);
 	mutex_unlock(&reporter->devlink->reporters_lock);
-	while (refcount_read(&reporter->refcount) > 1)
-		msleep(100);
-	mutex_destroy(&reporter->dump_lock);
-	if (reporter->dump_fmsg)
-		devlink_fmsg_free(reporter->dump_fmsg);
-	kfree(reporter);
 }
 EXPORT_SYMBOL_GPL(devlink_health_reporter_destroy);
 
@@ -5665,12 +5682,6 @@ int devlink_health_report(struct devlink_health_reporter *reporter,
 	return NULL;
 }
 
-static void
-devlink_health_reporter_put(struct devlink_health_reporter *reporter)
-{
-	refcount_dec(&reporter->refcount);
-}
-
 void
 devlink_health_reporter_state_update(struct devlink_health_reporter *reporter,
 				     enum devlink_health_reporter_state state)
-- 
1.8.3.1