linux-kernel - [PATCH 3/5] thunderbolt: No need to take tb->lock in domain suspend/complete

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Message-Id: <20180618110731.57427-4-mika.westerberg@linux.intel.com>
Date:   Mon, 18 Jun 2018 14:07:29 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Christian Kellner <christian@...lner.me>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 3/5] thunderbolt: No need to take tb->lock in domain suspend/complete

If the connection manager implementation needs to touch the domain
structures it ought to take the lock itself. Currently only ICM
implements these hooks and it does not need the lock because we there
will be no notifications before driver ready message is sent to it.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/thunderbolt/domain.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c
index 6281266b8ec0..b34e7f118fcf 100644
--- a/drivers/thunderbolt/domain.c
+++ b/drivers/thunderbolt/domain.c
@@ -505,26 +505,13 @@ int tb_domain_resume_noirq(struct tb *tb)
 
 int tb_domain_suspend(struct tb *tb)
 {
-	int ret;
-
-	mutex_lock(&tb->lock);
-	if (tb->cm_ops->suspend) {
-		ret = tb->cm_ops->suspend(tb);
-		if (ret) {
-			mutex_unlock(&tb->lock);
-			return ret;
-		}
-	}
-	mutex_unlock(&tb->lock);
-	return 0;
+	return tb->cm_ops->suspend ? tb->cm_ops->suspend(tb) : 0;
 }
 
 void tb_domain_complete(struct tb *tb)
 {
-	mutex_lock(&tb->lock);
 	if (tb->cm_ops->complete)
 		tb->cm_ops->complete(tb);
-	mutex_unlock(&tb->lock);
 }
 
 /**
-- 
2.17.1