linux-kernel - [PATCH 4/6] net: atm: Add missing annotation for lec_seq

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Message-Id: <20200429100529.19645-5-jbi.octave@gmail.com>
Date:   Wed, 29 Apr 2020 11:05:26 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        netdev@...r.kernel.org (open list:NETWORKING [GENERAL])
Subject: [PATCH 4/6] net: atm: Add missing annotation for lec_seq_stop()

Sparse reports a warning at lec_seq_stop()
warning: context imbalance in lec_seq_stop() - unexpected unlock

The root cause is the missing annotation at lec_seq_stop()
The __release() annotation inside lec_seq_stop()
tells only Sparse to shutdown the warning

Add the missing __releases(&state->locked->lec_arp_lock)
Add   __release(&state->locked->lec_arp_lock) annotation

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 net/atm/lec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/atm/lec.c b/net/atm/lec.c
index 25fa3a7b72bd..22415bc11878 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -940,6 +940,7 @@ static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 }
 
 static void lec_seq_stop(struct seq_file *seq, void *v)
+	__releases(&state->locked->lec_arp_lock)
 {
 	struct lec_state *state = seq->private;
 
@@ -947,7 +948,9 @@ static void lec_seq_stop(struct seq_file *seq, void *v)
 		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 				       state->flags);
 		dev_put(state->dev);
-	}
+	} else
+		/* annotation for sparse */
+		__release(&state->locked->lec_arp_lock);
 }
 
 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-- 
2.25.3