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Subject: Re: [PATCH v2] iwlwifi: Fix softirq/hardirq disabling in
 iwl_pcie_gen2_enqueue_hcmd()
From:   Kalle Valo <kvalo@codeaurora.org>
In-Reply-To: <nycvar.YFH.7.76.2104171112390.18270@cbobk.fhfr.pm>
References: <nycvar.YFH.7.76.2104171112390.18270@cbobk.fhfr.pm>
To:     Jiri Kosina <jikos@kernel.org>
Cc:     Heiner Kallweit <hkallweit1@gmail.com>,
        linux-wireless <linux-wireless@vger.kernel.org>
User-Agent: pwcli/0.1.0-git (https://github.com/kvalo/pwcli/) Python/3.5.2
Message-Id: <20210419173618.A015CC4338A@smtp.codeaurora.org>
Date:   Mon, 19 Apr 2021 17:36:18 +0000 (UTC)
Precedence: bulk

Jiri Kosina <jikos@kernel.org> wrote:

> From: Jiri Kosina <jkosina@suse.cz>
> 
> Analogically to what we did in 2800aadc18a6 ("iwlwifi: Fix softirq/hardirq 
> disabling in iwl_pcie_enqueue_hcmd()"), we must apply the same fix to 
> iwl_pcie_gen2_enqueue_hcmd(), as it's being called from exactly the same 
> contexts.
> 
> Reported-by: Heiner Kallweit <hkallweit1@gmail.com
> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
> 
> diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
> index 4456abb9a074..34bde8c87324 100644
> --- a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
> +++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
> @@ -40,6 +40,7 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
>  	const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
>  	u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
>  	struct iwl_tfh_tfd *tfd;
> +	unsigned long flags;
>  
>  	copy_size = sizeof(struct iwl_cmd_header_wide);
>  	cmd_size = sizeof(struct iwl_cmd_header_wide);
> @@ -108,14 +109,14 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
>  		goto free_dup_buf;
>  	}
>  
> -	spin_lock_bh(&txq->lock);
> +	spin_lock_irqsave(&txq->lock, flags);
>  
>  	idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
>  	tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
>  	memset(tfd, 0, sizeof(*tfd));
>  
>  	if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
> -		spin_unlock_bh(&txq->lock);
> +		spin_unlock_irqrestore(&txq->lock, flags);
>  
>  		IWL_ERR(trans, "No space in command queue\n");
>  		iwl_op_mode_cmd_queue_full(trans->op_mode);
> @@ -250,7 +251,7 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
>  	spin_unlock(&trans_pcie->reg_lock);
>  
>  out:
> -	spin_unlock_bh(&txq->lock);
> +	spin_unlock_irqrestore(&txq->lock, flags);
>  free_dup_buf:
>  	if (idx < 0)
>  		kfree(dup_buf);

Patch applied to wireless-drivers.git, thanks.

e7020bb068d8 iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_gen2_enqueue_hcmd()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/nycvar.YFH.7.76.2104171112390.18270@cbobk.fhfr.pm/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches