> From: netdev-ow...@vger.kernel.org [mailto:netdev- > ow...@vger.kernel.org] On Behalf Of Benjamin Poirier > Sent: Monday, March 5, 2018 5:56 PM > To: Kirsher, Jeffrey T <jeffrey.t.kirs...@intel.com> > Cc: Alexander Duyck <alexander.du...@gmail.com>; Lennart Sorensen > <lsore...@csclub.uwaterloo.ca>; intel-wired-...@lists.osuosl.org; > netdev@vger.kernel.org; linux-ker...@vger.kernel.org > Subject: [PATCH 2/2] e1000e: Fix link check race condition > > Alex reported the following race condition: > > /* link goes up... interrupt... schedule watchdog */ > \ e1000_watchdog_task > \ e1000e_has_link > \ hw->mac.ops.check_for_link() === > e1000e_check_for_copper_link > \ e1000e_phy_has_link_generic(..., &link) > link = true > > /* link goes down... interrupt */ > \ e1000_msix_other > hw->mac.get_link_status = > true > > /* link is up */ > mac->get_link_status = false > > link_active = true > /* link_active is true, wrongly, and stays so because > * get_link_status is false */ > > Avoid this problem by making sure that we don't set get_link_status = false > after having checked the link. > > It seems this problem has been present since the introduction of e1000e. > > Link: https://lkml.org/lkml/2018/1/29/338 > Reported-by: Alexander Duyck <alexander.du...@gmail.com> > Signed-off-by: Benjamin Poirier <bpoir...@suse.com> > --- > drivers/net/ethernet/intel/e1000e/ich8lan.c | 31 ++++++++++++++++------- > ------ > drivers/net/ethernet/intel/e1000e/mac.c | 14 ++++++------- > 2 files changed, 24 insertions(+), 21 deletions(-)
Tested-by: Aaron Brown <aaron.f.br...@intel.com>
