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Message-ID: <ZJV+dUvm4Mg1QNeR@boxer>
Date: Fri, 23 Jun 2023 13:13:57 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
CC: Tony Nguyen <anthony.l.nguyen@...el.com>, <davem@...emloft.net>,
<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
<netdev@...r.kernel.org>, Michal Swiatkowski
<michal.swiatkowski@...ux.intel.com>, Michal Wilczynski
<michal.wilczynski@...el.com>, Simon Horman <simon.horman@...igine.com>,
Arpana Arland <arpanax.arland@...el.com>
Subject: Re: [PATCH net-next 4/6] ice: remove null checks before devm_kfree()
calls
On Fri, Jun 23, 2023 at 12:44:29PM +0200, Przemek Kitszel wrote:
> On 6/23/23 12:23, Maciej Fijalkowski wrote:
> > On Thu, Jun 22, 2023 at 11:35:59AM -0700, Tony Nguyen wrote:
> > > From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> > >
> > > We all know they are redundant.
> >
> > Przemek,
> >
> > Ok, they are redundant, but could you also audit the driver if these devm_
> > allocations could become a plain kzalloc/kfree calls?
>
> Olek was also motivating such audit :)
>
> I have some cases collected with intention to send in bulk for next window,
> list is not exhaustive though.
When rev-by count tag would be considered too much? I have a mixed
feelings about providing yet another one, however...
>
> >
> > >
> > > Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> > > Reviewed-by: Michal Wilczynski <michal.wilczynski@...el.com>
> > > Reviewed-by: Simon Horman <simon.horman@...igine.com>
> > > Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> > > Tested-by: Arpana Arland <arpanax.arland@...el.com> (A Contingent worker at Intel)
> > > Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> > > ---
> > > drivers/net/ethernet/intel/ice/ice_common.c | 6 +--
> > > drivers/net/ethernet/intel/ice/ice_controlq.c | 3 +-
> > > drivers/net/ethernet/intel/ice/ice_flow.c | 23 ++--------
> > > drivers/net/ethernet/intel/ice/ice_lib.c | 42 +++++++------------
> > > drivers/net/ethernet/intel/ice/ice_sched.c | 11 ++---
> > > drivers/net/ethernet/intel/ice/ice_switch.c | 19 +++------
> > > 6 files changed, 29 insertions(+), 75 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
> > > index eb2dc0983776..6acb40f3c202 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_common.c
> > > +++ b/drivers/net/ethernet/intel/ice/ice_common.c
> > > @@ -814,8 +814,7 @@ static void ice_cleanup_fltr_mgmt_struct(struct ice_hw *hw)
> > > devm_kfree(ice_hw_to_dev(hw), lst_itr);
> > > }
> > > }
> > > - if (recps[i].root_buf)
> > > - devm_kfree(ice_hw_to_dev(hw), recps[i].root_buf);
> > > + devm_kfree(ice_hw_to_dev(hw), recps[i].root_buf);
> > > }
> > > ice_rm_all_sw_replay_rule_info(hw);
> > > devm_kfree(ice_hw_to_dev(hw), sw->recp_list);
> > > @@ -1011,8 +1010,7 @@ static int ice_cfg_fw_log(struct ice_hw *hw, bool enable)
> > > }
> > > out:
> > > - if (data)
> > > - devm_kfree(ice_hw_to_dev(hw), data);
> > > + devm_kfree(ice_hw_to_dev(hw), data);
> > > return status;
> > > }
> > > diff --git a/drivers/net/ethernet/intel/ice/ice_controlq.c b/drivers/net/ethernet/intel/ice/ice_controlq.c
> > > index 385fd88831db..e7d2474c431c 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_controlq.c
> > > +++ b/drivers/net/ethernet/intel/ice/ice_controlq.c
> > > @@ -339,8 +339,7 @@ do { \
> > > } \
> > > } \
> > > /* free the buffer info list */ \
> > > - if ((qi)->ring.cmd_buf) \
> > > - devm_kfree(ice_hw_to_dev(hw), (qi)->ring.cmd_buf); \
> > > + devm_kfree(ice_hw_to_dev(hw), (qi)->ring.cmd_buf); \
> > > /* free DMA head */ \
> > > devm_kfree(ice_hw_to_dev(hw), (qi)->ring.dma_head); \
> > > } while (0)
> > > diff --git a/drivers/net/ethernet/intel/ice/ice_flow.c b/drivers/net/ethernet/intel/ice/ice_flow.c
> > > index ef103e47a8dc..85cca572c22a 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_flow.c
> > > +++ b/drivers/net/ethernet/intel/ice/ice_flow.c
> > > @@ -1303,23 +1303,6 @@ ice_flow_find_prof_id(struct ice_hw *hw, enum ice_block blk, u64 prof_id)
> > > return NULL;
> > > }
> > > -/**
> > > - * ice_dealloc_flow_entry - Deallocate flow entry memory
> > > - * @hw: pointer to the HW struct
> > > - * @entry: flow entry to be removed
> > > - */
> > > -static void
> > > -ice_dealloc_flow_entry(struct ice_hw *hw, struct ice_flow_entry *entry)
> > > -{
> > > - if (!entry)
> > > - return;
> > > -
> > > - if (entry->entry)
...would you be able to point me to the chunk of code that actually sets
ice_flow_entry::entry? because from a quick glance I can't seem to find
it.
> > > - devm_kfree(ice_hw_to_dev(hw), entry->entry);
> > > -
> > > - devm_kfree(ice_hw_to_dev(hw), entry);
> > > -}
> > > -
> > > /**
> > > * ice_flow_rem_entry_sync - Remove a flow entry
> > > * @hw: pointer to the HW struct
> > > @@ -1335,7 +1318,8 @@ ice_flow_rem_entry_sync(struct ice_hw *hw, enum ice_block __always_unused blk,
> > > list_del(&entry->l_entry);
> > > - ice_dealloc_flow_entry(hw, entry);
> > > + devm_kfree(ice_hw_to_dev(hw), entry->entry);
> > > + devm_kfree(ice_hw_to_dev(hw), entry);
> > > return 0;
> > > }
> > > @@ -1662,8 +1646,7 @@ ice_flow_add_entry(struct ice_hw *hw, enum ice_block blk, u64 prof_id,
> > > out:
> > > if (status && e) {
> > > - if (e->entry)
> > > - devm_kfree(ice_hw_to_dev(hw), e->entry);
> > > + devm_kfree(ice_hw_to_dev(hw), e->entry);
> > > devm_kfree(ice_hw_to_dev(hw), e);
> > > }
(...)
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