Messages in this thread |  | | From | "Brown, Aaron F" <> | Subject | RE: [PATCH] net: intel: e1000e: fix possible sleep-in-atomic-context bugs in e1000e_get_hw_semaphore() | Date | Thu, 9 Jan 2020 01:01:05 +0000 |
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> From: netdev-owner@vger.kernel.org <netdev-owner@vger.kernel.org> > On Behalf Of Jia-Ju Bai > Sent: Wednesday, December 18, 2019 6:17 AM > To: Kirsher, Jeffrey T <jeffrey.t.kirsher@intel.com>; davem@davemloft.net > Cc: intel-wired-lan@lists.osuosl.org; netdev@vger.kernel.org; linux- > kernel@vger.kernel.org; Jia-Ju Bai <baijiaju1990@gmail.com> > Subject: [PATCH] net: intel: e1000e: fix possible sleep-in-atomic-context bugs > in e1000e_get_hw_semaphore() > > The driver may sleep while holding a spinlock. > The function call path (from bottom to top) in Linux 4.19 is: > > drivers/net/ethernet/intel/e1000e/mac.c, 1366: > usleep_range in e1000e_get_hw_semaphore > drivers/net/ethernet/intel/e1000e/80003es2lan.c, 322: > e1000e_get_hw_semaphore in > e1000_release_swfw_sync_80003es2lan > drivers/net/ethernet/intel/e1000e/80003es2lan.c, 197: > e1000_release_swfw_sync_80003es2lan in > e1000_release_phy_80003es2lan > drivers/net/ethernet/intel/e1000e/netdev.c, 4883: > (FUNC_PTR) e1000_release_phy_80003es2lan in > e1000e_update_phy_stats > drivers/net/ethernet/intel/e1000e/netdev.c, 4917: > e1000e_update_phy_stats in e1000e_update_stats > drivers/net/ethernet/intel/e1000e/netdev.c, 5945: > e1000e_update_stats in e1000e_get_stats64 > drivers/net/ethernet/intel/e1000e/netdev.c, 5944: > spin_lock in e1000e_get_stats64 > > drivers/net/ethernet/intel/e1000e/mac.c, 1384: > usleep_range in e1000e_get_hw_semaphore > drivers/net/ethernet/intel/e1000e/80003es2lan.c, 322: > e1000e_get_hw_semaphore in > e1000_release_swfw_sync_80003es2lan > drivers/net/ethernet/intel/e1000e/80003es2lan.c, 197: > e1000_release_swfw_sync_80003es2lan in > e1000_release_phy_80003es2lan > drivers/net/ethernet/intel/e1000e/netdev.c, 4883: > (FUNC_PTR) e1000_release_phy_80003es2lan in > e1000e_update_phy_stats > drivers/net/ethernet/intel/e1000e/netdev.c, 4917: > e1000e_update_phy_stats in e1000e_update_stats > drivers/net/ethernet/intel/e1000e/netdev.c, 5945: > e1000e_update_stats in e1000e_get_stats64 > drivers/net/ethernet/intel/e1000e/netdev.c, 5944: > spin_lock in e1000e_get_stats64 > > (FUNC_PTR) means a function pointer is called. > > To fix these bugs, usleep_range() is replaced with udelay(). > > These bugs are found by a static analysis tool STCheck written by myself. > > Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> > --- > drivers/net/ethernet/intel/e1000e/mac.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) >
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
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