netdev - Re: [PATCH net 1/1] ixgbe: Add locking to prevent panic when setting sriov

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Message-ID: <20220628102707.436e7253@kernel.org>
Date:   Tue, 28 Jun 2022 10:27:07 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com,
        Piotr Skajewski <piotrx.skajewski@...el.com>,
        netdev@...r.kernel.org,
        Konrad Jankowski <konrad0.jankowski@...el.com>
Subject: Re: [PATCH net 1/1] ixgbe: Add locking to prevent panic when
 setting sriov_numvfs to zero

On Tue, 28 Jun 2022 09:53:46 -0700 Tony Nguyen wrote:
> +	spin_lock_irqsave(&adapter->vfs_lock, flags);
> +
>  	/* set num VFs to 0 to prevent access to vfinfo */
>  	adapter->num_vfs = 0;
>  
> @@ -228,6 +231,8 @@ int ixgbe_disable_sriov(struct ixgbe_adapter *adapter)
>  	kfree(adapter->mv_list);
>  	adapter->mv_list = NULL;
>  
> +	spin_unlock_irqrestore(&adapter->vfs_lock, flags);

There's a pci_dev_put() in there, are you sure it won't sleep?