linux-kernel - Re: [PATCH -next] scsi: efct: don't use GFP

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Date:   Mon, 10 Jan 2022 12:19:21 +0100
From:   Maurizio Lombardi <mlombard@...hat.com>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, target-devel@...r.kernel.org,
        linux-scsi@...r.kernel.org, hch@....de, james.smart@...adcom.com,
        martin.petersen@...cle.com
Subject: Re: [PATCH -next] scsi: efct: don't use GFP_KERNEL under spin lock

On Mon, Jan 10, 2022 at 07:18:38PM +0800, Yang Yingliang wrote:
> +	spin_lock_irqsave(&node->els_ios_lock, flags);
> +
>  	if (els) {
>  		/* initialize fields */
>  		els->els_retries_remaining = EFC_FC_ELS_DEFAULT_RETRIES;

If the els pointer is NULL you will lock the spinlock and disable the interrupts
for no reason, maybe you can just protect the list_add_tail()?

+spin_lock_irqsave(&node->els_ios_lock, flags);
 list_add_tail(&els->list_entry, &node->els_ios_list);
+spin_unlock_irqrestore(&node->els_ios_lock, flags);

Maurizio