linux-kernel - Re: [PATCH] ath: move spin_lock_bh to spin

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Date:   Tue, 22 Jan 2019 15:59:02 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kbuild@...org, Zhiwei Jiang <qq282012236@...il.com>
Cc:     kbuild-all@...org, qq282012236@...il.com,
        ath9k-devel@....qualcomm.com, kvalo@...eaurora.org,
        davem@...emloft.net, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ath: move spin_lock_bh to spin_lock in tasklet

Hi Zhiwei,

Thank you for the patch! Perhaps something to improve:

url:    https://github.com/0day-ci/linux/commits/Zhiwei-Jiang/ath-move-spin_lock_bh-to-spin_lock-in-tasklet/20190121-185529
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next.git master

smatch warnings:
drivers/net/wireless/ath/ath9k/htc_drv_txrx.c:584 ath9k_tx_failed_tasklet() warn: inconsistent returns 'bottom_half:'.
  Locked on:   line 584
  Unlocked on: line 580

# https://github.com/0day-ci/linux/commit/953929a8fc22ae7ab9adafed62c84a11c4be2270
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 953929a8fc22ae7ab9adafed62c84a11c4be2270
vim +584 drivers/net/wireless/ath/ath9k/htc_drv_txrx.c

27876a29 Sujith Manoharan 2011-04-13  572  
27876a29 Sujith Manoharan 2011-04-13  573  void ath9k_tx_failed_tasklet(unsigned long data)
27876a29 Sujith Manoharan 2011-04-13  574  {
27876a29 Sujith Manoharan 2011-04-13  575  	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
b587fc81 Sujith Manoharan 2011-04-13  576  
953929a8 Zhiwei Jiang     2019-01-19  577  	spin_lock(&priv->tx.tx_lock);
27876a29 Sujith Manoharan 2011-04-13  578  	if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
27876a29 Sujith Manoharan 2011-04-13  579  		spin_unlock_bh(&priv->tx.tx_lock);
                                                                   ^^^
Missed this one.

27876a29 Sujith Manoharan 2011-04-13  580  		return;
b587fc81 Sujith Manoharan 2011-04-13  581  	}
953929a8 Zhiwei Jiang     2019-01-19  582  	spin_unlock(&priv->tx.tx_lock);
b587fc81 Sujith Manoharan 2011-04-13  583  
27876a29 Sujith Manoharan 2011-04-13 @584  	ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
b587fc81 Sujith Manoharan 2011-04-13  585  }
27876a29 Sujith Manoharan 2011-04-13  586  

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