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From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: "Jérôme Pouiller" <jerome.pouiller@silabs.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/6] staging: wfx: annotate nested gc_list vs tx queue locking
Date: Tue, 11 Feb 2020 11:35:01 +0100	[thread overview]
Message-ID: <5e30397af95854b4a7deea073b730c00229f42ba.1581416843.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1581416843.git.mirq-linux@rere.qmqm.pl>

Lockdep is complaining about recursive locking, because it can't make
a difference between locked skb_queues. Annotate nested locks and avoid
double bh_disable/enable.

[...]
insmod/815 is trying to acquire lock:
cb7d6418 (&(&list->lock)->rlock){+...}, at: wfx_tx_queues_clear+0xfc/0x198 [wfx]

but task is already holding lock:
cb7d61f4 (&(&list->lock)->rlock){+...}, at: wfx_tx_queues_clear+0xa0/0x198 [wfx]

[...]
Possible unsafe locking scenario:

      CPU0
      ----
 lock(&(&list->lock)->rlock);
 lock(&(&list->lock)->rlock);

Cc: stable@vger.kernel.org
Fixes: 9bca45f3d692 ("staging: wfx: allow to send 802.11 frames")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/staging/wfx/queue.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index 0bcc61feee1d..51d6c55ae91f 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -130,12 +130,12 @@ static void wfx_tx_queue_clear(struct wfx_dev *wdev, struct wfx_queue *queue,
 	spin_lock_bh(&queue->queue.lock);
 	while ((item = __skb_dequeue(&queue->queue)) != NULL)
 		skb_queue_head(gc_list, item);
-	spin_lock_bh(&stats->pending.lock);
+	spin_lock_nested(&stats->pending.lock, 1);
 	for (i = 0; i < ARRAY_SIZE(stats->link_map_cache); ++i) {
 		stats->link_map_cache[i] -= queue->link_map_cache[i];
 		queue->link_map_cache[i] = 0;
 	}
-	spin_unlock_bh(&stats->pending.lock);
+	spin_unlock(&stats->pending.lock);
 	spin_unlock_bh(&queue->queue.lock);
 }
 
@@ -207,9 +207,9 @@ void wfx_tx_queue_put(struct wfx_dev *wdev, struct wfx_queue *queue,
 
 	++queue->link_map_cache[tx_priv->link_id];
 
-	spin_lock_bh(&stats->pending.lock);
+	spin_lock_nested(&stats->pending.lock, 1);
 	++stats->link_map_cache[tx_priv->link_id];
-	spin_unlock_bh(&stats->pending.lock);
+	spin_unlock(&stats->pending.lock);
 	spin_unlock_bh(&queue->queue.lock);
 }
 
@@ -237,11 +237,11 @@ static struct sk_buff *wfx_tx_queue_get(struct wfx_dev *wdev,
 		__skb_unlink(skb, &queue->queue);
 		--queue->link_map_cache[tx_priv->link_id];
 
-		spin_lock_bh(&stats->pending.lock);
+		spin_lock_nested(&stats->pending.lock, 1);
 		__skb_queue_tail(&stats->pending, skb);
 		if (!--stats->link_map_cache[tx_priv->link_id])
 			wakeup_stats = true;
-		spin_unlock_bh(&stats->pending.lock);
+		spin_unlock(&stats->pending.lock);
 	}
 	spin_unlock_bh(&queue->queue.lock);
 	if (wakeup_stats)
@@ -259,10 +259,10 @@ int wfx_pending_requeue(struct wfx_dev *wdev, struct sk_buff *skb)
 	spin_lock_bh(&queue->queue.lock);
 	++queue->link_map_cache[tx_priv->link_id];
 
-	spin_lock_bh(&stats->pending.lock);
+	spin_lock_nested(&stats->pending.lock, 1);
 	++stats->link_map_cache[tx_priv->link_id];
 	__skb_unlink(skb, &stats->pending);
-	spin_unlock_bh(&stats->pending.lock);
+	spin_unlock(&stats->pending.lock);
 	__skb_queue_tail(&queue->queue, skb);
 	spin_unlock_bh(&queue->queue.lock);
 	return 0;
-- 
2.20.1


WARNING: multiple messages have this Message-ID
From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: "Jérôme Pouiller" <jerome.pouiller@silabs.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/6] staging: wfx: annotate nested gc_list vs tx queue locking
Date: Tue, 11 Feb 2020 11:35:01 +0100	[thread overview]
Message-ID: <5e30397af95854b4a7deea073b730c00229f42ba.1581416843.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1581416843.git.mirq-linux@rere.qmqm.pl>

Lockdep is complaining about recursive locking, because it can't make
a difference between locked skb_queues. Annotate nested locks and avoid
double bh_disable/enable.

[...]
insmod/815 is trying to acquire lock:
cb7d6418 (&(&list->lock)->rlock){+...}, at: wfx_tx_queues_clear+0xfc/0x198 [wfx]

but task is already holding lock:
cb7d61f4 (&(&list->lock)->rlock){+...}, at: wfx_tx_queues_clear+0xa0/0x198 [wfx]

[...]
Possible unsafe locking scenario:

      CPU0
      ----
 lock(&(&list->lock)->rlock);
 lock(&(&list->lock)->rlock);

Cc: stable@vger.kernel.org
Fixes: 9bca45f3d692 ("staging: wfx: allow to send 802.11 frames")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/staging/wfx/queue.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index 0bcc61feee1d..51d6c55ae91f 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -130,12 +130,12 @@ static void wfx_tx_queue_clear(struct wfx_dev *wdev, struct wfx_queue *queue,
 	spin_lock_bh(&queue->queue.lock);
 	while ((item = __skb_dequeue(&queue->queue)) != NULL)
 		skb_queue_head(gc_list, item);
-	spin_lock_bh(&stats->pending.lock);
+	spin_lock_nested(&stats->pending.lock, 1);
 	for (i = 0; i < ARRAY_SIZE(stats->link_map_cache); ++i) {
 		stats->link_map_cache[i] -= queue->link_map_cache[i];
 		queue->link_map_cache[i] = 0;
 	}
-	spin_unlock_bh(&stats->pending.lock);
+	spin_unlock(&stats->pending.lock);
 	spin_unlock_bh(&queue->queue.lock);
 }
 
@@ -207,9 +207,9 @@ void wfx_tx_queue_put(struct wfx_dev *wdev, struct wfx_queue *queue,
 
 	++queue->link_map_cache[tx_priv->link_id];
 
-	spin_lock_bh(&stats->pending.lock);
+	spin_lock_nested(&stats->pending.lock, 1);
 	++stats->link_map_cache[tx_priv->link_id];
-	spin_unlock_bh(&stats->pending.lock);
+	spin_unlock(&stats->pending.lock);
 	spin_unlock_bh(&queue->queue.lock);
 }
 
@@ -237,11 +237,11 @@ static struct sk_buff *wfx_tx_queue_get(struct wfx_dev *wdev,
 		__skb_unlink(skb, &queue->queue);
 		--queue->link_map_cache[tx_priv->link_id];
 
-		spin_lock_bh(&stats->pending.lock);
+		spin_lock_nested(&stats->pending.lock, 1);
 		__skb_queue_tail(&stats->pending, skb);
 		if (!--stats->link_map_cache[tx_priv->link_id])
 			wakeup_stats = true;
-		spin_unlock_bh(&stats->pending.lock);
+		spin_unlock(&stats->pending.lock);
 	}
 	spin_unlock_bh(&queue->queue.lock);
 	if (wakeup_stats)
@@ -259,10 +259,10 @@ int wfx_pending_requeue(struct wfx_dev *wdev, struct sk_buff *skb)
 	spin_lock_bh(&queue->queue.lock);
 	++queue->link_map_cache[tx_priv->link_id];
 
-	spin_lock_bh(&stats->pending.lock);
+	spin_lock_nested(&stats->pending.lock, 1);
 	++stats->link_map_cache[tx_priv->link_id];
 	__skb_unlink(skb, &stats->pending);
-	spin_unlock_bh(&stats->pending.lock);
+	spin_unlock(&stats->pending.lock);
 	__skb_queue_tail(&queue->queue, skb);
 	spin_unlock_bh(&queue->queue.lock);
 	return 0;
-- 
2.20.1

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  parent reply	other threads:[~2020-02-11 10:35 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
2020-02-11 10:34 ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race Michał Mirosław
2020-02-11 10:35   ` Michał Mirosław
2020-02-11 11:19   ` Jérôme Pouiller
2020-02-11 11:19     ` Jérôme Pouiller
2020-02-11 12:49     ` Michał Mirosław
2020-02-11 12:49       ` Michał Mirosław
2020-02-11 15:20       ` Jérôme Pouiller
2020-02-11 15:20         ` Jérôme Pouiller
2020-02-11 10:35 ` Michał Mirosław [this message]
2020-02-11 10:35   ` [PATCH v2 2/6] staging: wfx: annotate nested gc_list vs tx queue locking Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 3/6] staging: wfx: add proper "compatible" string Michał Mirosław
2020-02-11 10:35   ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 4/6] staging: wfx: follow compatible = vendor,chip format Michał Mirosław
2020-02-11 10:35   ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 5/6] staging: wfx: use sleeping gpio accessors Michał Mirosław
2020-02-11 10:35   ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 6/6] staging: wfx: use more power-efficient sleep for reset Michał Mirosław
2020-02-11 10:35   ` Michał Mirosław

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