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From: Sriram R <srirrama@codeaurora.org>
To: ath11k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org, Sriram R <srirrama@codeaurora.org>
Subject: [PATCH] ath11k: Avoid mgmt tx count underflow
Date: Mon, 30 Mar 2020 16:47:08 +0530	[thread overview]
Message-ID: <1585567028-9242-1-git-send-email-srirrama@codeaurora.org> (raw)

The mgmt tx count reference is incremented/decremented on every mgmt tx and on
tx completion event from firmware.
In case of an unexpected mgmt tx completion event from firmware,
the counter would underflow. Avoid this by decrementing
only when the tx count is greater than 0.

Signed-off-by: Sriram R <srirrama@codeaurora.org>
---
 drivers/net/wireless/ath/ath11k/wmi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index e7ce369..d999c47 100644
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -3740,8 +3740,9 @@ static int wmi_process_mgmt_tx_comp(struct ath11k *ar, u32 desc_id,
 
 	ieee80211_tx_status_irqsafe(ar->hw, msdu);
 
-	WARN_ON_ONCE(atomic_read(&ar->num_pending_mgmt_tx) == 0);
-	atomic_dec(&ar->num_pending_mgmt_tx);
+	/* WARN when we received this event without doing any mgmt tx */
+	if (atomic_dec_if_positive(&ar->num_pending_mgmt_tx) < 0)
+		WARN_ON_ONCE(1);
 
 	return 0;
 }
-- 
2.7.4

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WARNING: multiple messages have this Message-ID (diff)
From: Sriram R <srirrama@codeaurora.org>
To: ath11k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org, Sriram R <srirrama@codeaurora.org>
Subject: [PATCH] ath11k: Avoid mgmt tx count underflow
Date: Mon, 30 Mar 2020 16:47:08 +0530	[thread overview]
Message-ID: <1585567028-9242-1-git-send-email-srirrama@codeaurora.org> (raw)

The mgmt tx count reference is incremented/decremented on every mgmt tx and on
tx completion event from firmware.
In case of an unexpected mgmt tx completion event from firmware,
the counter would underflow. Avoid this by decrementing
only when the tx count is greater than 0.

Signed-off-by: Sriram R <srirrama@codeaurora.org>
---
 drivers/net/wireless/ath/ath11k/wmi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index e7ce369..d999c47 100644
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -3740,8 +3740,9 @@ static int wmi_process_mgmt_tx_comp(struct ath11k *ar, u32 desc_id,
 
 	ieee80211_tx_status_irqsafe(ar->hw, msdu);
 
-	WARN_ON_ONCE(atomic_read(&ar->num_pending_mgmt_tx) == 0);
-	atomic_dec(&ar->num_pending_mgmt_tx);
+	/* WARN when we received this event without doing any mgmt tx */
+	if (atomic_dec_if_positive(&ar->num_pending_mgmt_tx) < 0)
+		WARN_ON_ONCE(1);
 
 	return 0;
 }
-- 
2.7.4

             reply	other threads:[~2020-03-30 11:17 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-30 11:17 Sriram R [this message]
2020-03-30 11:17 ` [PATCH] ath11k: Avoid mgmt tx count underflow Sriram R
2020-04-06 16:24 ` Kalle Valo
2020-04-06 16:24 ` Kalle Valo

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