linux-kernel - [PATCH] wlcore: fix runtime pm imbalance in wlcore_irq

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Message-Id: <20200522044906.29564-1-dinghao.liu@zju.edu.cn>
Date:   Fri, 22 May 2020 12:49:04 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johannes Berg <johannes.berg@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>, Guy Mishol <guym@...com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Maital Hahn <maitalm@...com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Tony Lindgren <tony@...mide.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] wlcore: fix runtime pm imbalance in wlcore_irq_locked

When wlcore_fw_status() returns an error code, a pairing
runtime PM usage counter decrement is needed to keep the
counter balanced. It's the same for all error paths after
wlcore_fw_status().

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/net/wireless/ti/wlcore/main.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c
index f140f7d7f553..fd3608223f64 100644
--- a/drivers/net/wireless/ti/wlcore/main.c
+++ b/drivers/net/wireless/ti/wlcore/main.c
@@ -548,7 +548,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 
 		ret = wlcore_fw_status(wl, wl->fw_status);
 		if (ret < 0)
-			goto out;
+			goto err_ret;
 
 		wlcore_hw_tx_immediate_compl(wl);
 
@@ -565,7 +565,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 			ret = -EIO;
 
 			/* restarting the chip. ignore any other interrupt. */
-			goto out;
+			goto err_ret;
 		}
 
 		if (unlikely(intr & WL1271_ACX_SW_INTR_WATCHDOG)) {
@@ -575,7 +575,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 			ret = -EIO;
 
 			/* restarting the chip. ignore any other interrupt. */
-			goto out;
+			goto err_ret;
 		}
 
 		if (likely(intr & WL1271_ACX_INTR_DATA)) {
@@ -583,7 +583,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 
 			ret = wlcore_rx(wl, wl->fw_status);
 			if (ret < 0)
-				goto out;
+				goto err_ret;
 
 			/* Check if any tx blocks were freed */
 			spin_lock_irqsave(&wl->wl_lock, flags);
@@ -596,7 +596,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 				 */
 				ret = wlcore_tx_work_locked(wl);
 				if (ret < 0)
-					goto out;
+					goto err_ret;
 			} else {
 				spin_unlock_irqrestore(&wl->wl_lock, flags);
 			}
@@ -604,7 +604,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 			/* check for tx results */
 			ret = wlcore_hw_tx_delayed_compl(wl);
 			if (ret < 0)
-				goto out;
+				goto err_ret;
 
 			/* Make sure the deferred queues don't get too long */
 			defer_count = skb_queue_len(&wl->deferred_tx_queue) +
@@ -617,14 +617,14 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 			wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_EVENT_A");
 			ret = wl1271_event_handle(wl, 0);
 			if (ret < 0)
-				goto out;
+				goto err_ret;
 		}
 
 		if (intr & WL1271_ACX_INTR_EVENT_B) {
 			wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_EVENT_B");
 			ret = wl1271_event_handle(wl, 1);
 			if (ret < 0)
-				goto out;
+				goto err_ret;
 		}
 
 		if (intr & WL1271_ACX_INTR_INIT_COMPLETE)
@@ -635,6 +635,7 @@ static int wlcore_irq_locked(struct wl1271 *wl)
 			wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_HW_AVAILABLE");
 	}
 
+err_ret:
 	pm_runtime_mark_last_busy(wl->dev);
 	pm_runtime_put_autosuspend(wl->dev);
 
-- 
2.17.1