lkml.org 
[lkml]   [2015]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/1] stmmac: bugfix oops on rmmod after ifconfig
Date
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>

---
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


\
 
 \ /
  Last update: 2015-04-13 13:21    [W:0.082 / U:1.388 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site