Re: [patch 10/35] net: intel: Remove in_interrupt() warnings

[Alexander Duyck <alexander.duyck@gmail.com>]

On Sun, Sep 27, 2020 at 1:00 PM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>
> in_interrupt() is ill defined and does not provide what the name
> suggests. The usage especially in driver code is deprecated and a tree wide
> effort to clean up and consolidate the (ab)usage of in_interrupt() and
> related checks is happening.
>
> In this case the checks cover only parts of the contexts in which these
> functions cannot be called. They fail to detect preemption or interrupt
> disabled invocations.
>
> As the functions which are invoked from the various places contain already
> a broad variety of checks (always enabled or debug option dependent) cover
> all invalid conditions already, there is no point in having inconsistent
> warnings in those drivers.
>
> Just remove them.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: netdev@vger.kernel.org

The patch looks good to me.

Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>

> ---
>  drivers/net/ethernet/intel/e1000/e1000_main.c     |    1 -
>  drivers/net/ethernet/intel/fm10k/fm10k_pci.c      |    2 --
>  drivers/net/ethernet/intel/i40e/i40e_main.c       |    4 ----
>  drivers/net/ethernet/intel/ice/ice_main.c         |    1 -
>  drivers/net/ethernet/intel/igb/igb_main.c         |    1 -
>  drivers/net/ethernet/intel/igc/igc_main.c         |    1 -
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |    1 -
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |    2 --
>  8 files changed, 13 deletions(-)
>
> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
> @@ -534,7 +534,6 @@ void e1000_down(struct e1000_adapter *ad
>
>  void e1000_reinit_locked(struct e1000_adapter *adapter)
>  {
> -       WARN_ON(in_interrupt());
>         while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
>                 msleep(1);
>
> --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
> +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
> @@ -221,8 +221,6 @@ static bool fm10k_prepare_for_reset(stru
>  {
>         struct net_device *netdev = interface->netdev;
>
> -       WARN_ON(in_interrupt());
> -
>         /* put off any impending NetWatchDogTimeout */
>         netif_trans_update(netdev);
>
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -6689,7 +6689,6 @@ static void i40e_vsi_reinit_locked(struc
>  {
>         struct i40e_pf *pf = vsi->back;
>
> -       WARN_ON(in_interrupt());
>         while (test_and_set_bit(__I40E_CONFIG_BUSY, pf->state))
>                 usleep_range(1000, 2000);
>         i40e_down(vsi);
> @@ -8462,9 +8461,6 @@ void i40e_do_reset(struct i40e_pf *pf, u
>  {
>         u32 val;
>
> -       WARN_ON(in_interrupt());
> -
> -
>         /* do the biggest reset indicated */
>         if (reset_flags & BIT_ULL(__I40E_GLOBAL_RESET_REQUESTED)) {
>
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -486,7 +486,6 @@ static void ice_do_reset(struct ice_pf *
>         struct ice_hw *hw = &pf->hw;
>
>         dev_dbg(dev, "reset_type 0x%x requested\n", reset_type);
> -       WARN_ON(in_interrupt());
>
>         ice_prepare_for_reset(pf);
>
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -2220,7 +2220,6 @@ void igb_down(struct igb_adapter *adapte
>
>  void igb_reinit_locked(struct igb_adapter *adapter)
>  {
> -       WARN_ON(in_interrupt());
>         while (test_and_set_bit(__IGB_RESETTING, &adapter->state))
>                 usleep_range(1000, 2000);
>         igb_down(adapter);
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -3831,7 +3831,6 @@ void igc_down(struct igc_adapter *adapte
>
>  void igc_reinit_locked(struct igc_adapter *adapter)
>  {
> -       WARN_ON(in_interrupt());
>         while (test_and_set_bit(__IGC_RESETTING, &adapter->state))
>                 usleep_range(1000, 2000);
>         igc_down(adapter);
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -5677,7 +5677,6 @@ static void ixgbe_up_complete(struct ixg
>
>  void ixgbe_reinit_locked(struct ixgbe_adapter *adapter)
>  {
> -       WARN_ON(in_interrupt());
>         /* put off any impending NetWatchDogTimeout */
>         netif_trans_update(adapter->netdev);
>
> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> @@ -2526,8 +2526,6 @@ void ixgbevf_down(struct ixgbevf_adapter
>
>  void ixgbevf_reinit_locked(struct ixgbevf_adapter *adapter)
>  {
> -       WARN_ON(in_interrupt());
> -
>         while (test_and_set_bit(__IXGBEVF_RESETTING, &adapter->state))
>                 msleep(1);
>
>