netdev - Re: [PATCH net-next] r8169: don't use pci_irq

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Date:   Tue, 28 Dec 2021 23:11:47 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net-next] r8169: don't use pci_irq_vector() in atomic
 context

On 28.12.2021 22:02, Heiner Kallweit wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> Since referenced change pci_irq_vector() can't be used in atomic
> context any longer. This conflicts with our usage of this function
> in rtl8169_netpoll(). Therefore store the interrupt number in
> struct rtl8169_private.
> 
> Fixes: 495c66aca3da ("genirq/msi: Convert to new functions")

Seeing the "fail" in patchwork: The referenced commit just recently
showed up in linux-next and isn't in net-next yet.


> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/ethernet/realtek/r8169_main.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 3d6843332..7161a5b1c 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -615,6 +615,7 @@ struct rtl8169_private {
>  	struct ring_info tx_skb[NUM_TX_DESC];	/* Tx data buffers */
>  	u16 cp_cmd;
>  	u32 irq_mask;
> +	int irq;
>  	struct clk *clk;
>  
>  	struct {
> @@ -4712,7 +4713,7 @@ static int rtl8169_close(struct net_device *dev)
>  
>  	cancel_work_sync(&tp->wk.work);
>  
> -	free_irq(pci_irq_vector(pdev, 0), tp);
> +	free_irq(tp->irq, tp);
>  
>  	phy_disconnect(tp->phydev);
>  
> @@ -4733,7 +4734,7 @@ static void rtl8169_netpoll(struct net_device *dev)
>  {
>  	struct rtl8169_private *tp = netdev_priv(dev);
>  
> -	rtl8169_interrupt(pci_irq_vector(tp->pci_dev, 0), tp);
> +	rtl8169_interrupt(tp->irq, tp);
>  }
>  #endif
>  
> @@ -4767,8 +4768,7 @@ static int rtl_open(struct net_device *dev)
>  	rtl_request_firmware(tp);
>  
>  	irqflags = pci_dev_msi_enabled(pdev) ? IRQF_NO_THREAD : IRQF_SHARED;
> -	retval = request_irq(pci_irq_vector(pdev, 0), rtl8169_interrupt,
> -			     irqflags, dev->name, tp);
> +	retval = request_irq(tp->irq, rtl8169_interrupt, irqflags, dev->name, tp);
>  	if (retval < 0)
>  		goto err_release_fw_2;
>  
> @@ -4785,7 +4785,7 @@ static int rtl_open(struct net_device *dev)
>  	return retval;
>  
>  err_free_irq:
> -	free_irq(pci_irq_vector(pdev, 0), tp);
> +	free_irq(tp->irq, tp);
>  err_release_fw_2:
>  	rtl_release_firmware(tp);
>  	rtl8169_rx_clear(tp);
> @@ -5360,6 +5360,7 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		dev_err(&pdev->dev, "Can't allocate interrupt\n");
>  		return rc;
>  	}
> +	tp->irq = pci_irq_vector(pdev, 0);
>  
>  	INIT_WORK(&tp->wk.work, rtl_task);
>  
> @@ -5435,8 +5436,7 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		return rc;
>  
>  	netdev_info(dev, "%s, %pM, XID %03x, IRQ %d\n",
> -		    rtl_chip_infos[chipset].name, dev->dev_addr, xid,
> -		    pci_irq_vector(pdev, 0));
> +		    rtl_chip_infos[chipset].name, dev->dev_addr, xid, tp->irq);
>  
>  	if (jumbo_max)
>  		netdev_info(dev, "jumbo features [frames: %d bytes, tx checksumming: %s]\n",