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Subject: Re: [Intel-wired-lan] [PATCH iwl-net v1 1/1] e1000e: change usleep_range to udelay in PHY mdic access X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Neftin, Sasha" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 17/04/2024 22:03, Lifshits, Vitaly wrote: > This is a partial revert of commit 6dbdd4de0362 ("e1000e: Workaround > for sporadic MDI error on Meteor Lake systems"). The referenced commit > introduced an issue on vPro systems, where disconnecting and reconnecting > the LAN cable might result in a kernel panic. > > This was root caused to the usage of usleep_range in an atomic content > while trying to access the PHY. Change back the usleep_range calls to > udelay. > > Fixes: 6dbdd4de0362 ("e1000e: Workaround for sporadic MDI error on Meteor Lake systems") > Co-developed-by: Sasha Neftin > Signed-off-by: Sasha Neftin > Signed-off-by: Vitaly Lifshits > --- > drivers/net/ethernet/intel/e1000e/phy.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c > index 93544f1cc2a5..f7ae0e0aa4a4 100644 > --- a/drivers/net/ethernet/intel/e1000e/phy.c > +++ b/drivers/net/ethernet/intel/e1000e/phy.c > @@ -157,7 +157,7 @@ s32 e1000e_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data) > * the lower time out > */ > for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 3); i++) { > - usleep_range(50, 60); > + udelay(50); > mdic = er32(MDIC); > if (mdic & E1000_MDIC_READY) > break; > @@ -181,7 +181,7 @@ s32 e1000e_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data) > * reading duplicate data in the next MDIC transaction. > */ > if (hw->mac.type == e1000_pch2lan) > - usleep_range(100, 150); > + udelay(100); > > if (success) { > *data = (u16)mdic; > @@ -237,7 +237,7 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data) > * the lower time out > */ > for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 3); i++) { > - usleep_range(50, 60); > + udelay(50); > mdic = er32(MDIC); > if (mdic & E1000_MDIC_READY) > break; > @@ -261,7 +261,7 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data) > * reading duplicate data in the next MDIC transaction. > */ > if (hw->mac.type == e1000_pch2lan) > - usleep_range(100, 150); > + udelay(100); > > if (success) > return 0; > -- > 2.34.1 > Tested-by: Dima Ruinskiy