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Message-ID: <50EDCBCA.8080601@redhat.com>
Date: Wed, 09 Jan 2013 14:58:02 -0500
From: John Greene <jogreene@...hat.com>
To: John Greene <jogreene@...hat.com>
CC: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
David Woodhouse <David.Woodhouse@...el.com>
Subject: Re: [PATCH] 8139cp: Prevent dev_close/cp_interrupt race on MTU change
On 12/19/2012 02:47 PM, John Greene wrote:
> commit: cb64edb6b89491edfdbae52ba7db9a8b8391d339 upstream
>
> Above commit may introduce a race between cp_interrupt and dev_close
> / change MTU / dev_open up state. Changes cp_interrupt to tolerate
> this. Change spin_locking in cp_interrupt to avoid possible
> but unobserved race.
>
> Reported-by: "Francois Romieu" <romieu@...zoreil.com>
>
> Tested on virtual hardware, Tx MTU size up to 4096, max tx payload
> was ping -s 4068 for MTU of 4096. No real hardware, need test
> assist.
>
> Signed-off-by: "John Greene" <jogreene@...hat.com>
> CC: "David S. Miller" <davem@...emloft.net>
> CC: "David Woodhouse" <David.Woodhouse@...el.com>
> ---
> drivers/net/ethernet/realtek/8139cp.c | 18 +++++++++++-------
> 1 file changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
> index 0da3f5e..585c35c 100644
> --- a/drivers/net/ethernet/realtek/8139cp.c
> +++ b/drivers/net/ethernet/realtek/8139cp.c
> @@ -577,28 +577,30 @@ static irqreturn_t cp_interrupt (int irq, void *dev_instance)
> {
> struct net_device *dev = dev_instance;
> struct cp_private *cp;
> + int handled = 0;
> u16 status;
>
> if (unlikely(dev == NULL))
> return IRQ_NONE;
> cp = netdev_priv(dev);
>
> + spin_lock(&cp->lock);
> +
> status = cpr16(IntrStatus);
> if (!status || (status == 0xFFFF))
> - return IRQ_NONE;
> + goto out_unlock;
> +
> + handled = 1;
>
> netif_dbg(cp, intr, dev, "intr, status %04x cmd %02x cpcmd %04x\n",
> status, cpr8(Cmd), cpr16(CpCmd));
>
> cpw16(IntrStatus, status & ~cp_rx_intr_mask);
>
> - spin_lock(&cp->lock);
> -
> /* close possible race's with dev_close */
> if (unlikely(!netif_running(dev))) {
> cpw16(IntrMask, 0);
> - spin_unlock(&cp->lock);
> - return IRQ_HANDLED;
> + goto out_unlock;
> }
>
> if (status & (RxOK | RxErr | RxEmpty | RxFIFOOvr))
> @@ -612,7 +614,6 @@ static irqreturn_t cp_interrupt (int irq, void *dev_instance)
> if (status & LinkChg)
> mii_check_media(&cp->mii_if, netif_msg_link(cp), false);
>
> - spin_unlock(&cp->lock);
>
> if (status & PciErr) {
> u16 pci_status;
> @@ -625,7 +626,10 @@ static irqreturn_t cp_interrupt (int irq, void *dev_instance)
> /* TODO: reset hardware */
> }
>
> - return IRQ_HANDLED;
> +out_unlock:
> + spin_unlock(&cp->lock);
> +
> + return IRQ_RETVAL(handled);
> }
>
> #ifdef CONFIG_NET_POLL_CONTROLLER
>
Can I get a quick update on this? Seems to have fallen thru the cracks.
Thanks.
--
John Greene
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