lkml.org 
[lkml]   [2015]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 1/1] stmmac: bugfix oops on rmmod after ifconfig
From
On Mon, Apr 13, 2015 at 2:15 PM, Bryan O'Donoghue
<pure.logic@nexus-software.ie> wrote:
> An oops exists in the flow of stmmac_release().
> phy_ethtool_get_wol() depends on phydev->drv which will be null in
> stmmac_dvr_remove after stmmac_mdio_unreg() completes.
>
> Steps to reproduce on Quark X1000:
>
> 1. ifconfig eth0 192.168.0.1
> 2. rmmod stmmac_pci
>
> This patch re-orders the calling of the unreg() functions so that
> stmmac_unreg_mdio() happens later in the release() routine thus avoiding the
> null pointer dereference.
>
> Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
> Reported-by: Dan O'Donovan <dan.odonovan@emutex.com>

Shouldn't Fixes: tag be present here?

>
> ---
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index a0ea84f..3ab3e4a8 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -2958,14 +2958,14 @@ int stmmac_dvr_remove(struct net_device *ndev)
> priv->hw->dma->stop_tx(priv->ioaddr);
>
> stmmac_set_mac(priv->ioaddr, false);
> - if (priv->pcs != STMMAC_PCS_RGMII && priv->pcs != STMMAC_PCS_TBI &&
> - priv->pcs != STMMAC_PCS_RTBI)
> - stmmac_mdio_unregister(ndev);
> netif_carrier_off(ndev);
> unregister_netdev(ndev);
> if (priv->stmmac_rst)
> reset_control_assert(priv->stmmac_rst);
> clk_disable_unprepare(priv->stmmac_clk);
> + if (priv->pcs != STMMAC_PCS_RGMII && priv->pcs != STMMAC_PCS_TBI &&
> + priv->pcs != STMMAC_PCS_RTBI)
> + stmmac_mdio_unregister(ndev);
> free_netdev(ndev);
>
> return 0;
> --
> 1.9.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/



--
With Best Regards,
Andy Shevchenko


\
 
 \ /
  Last update: 2015-04-13 13:41    [W:0.048 / U:1.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site