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Date: Sat, 16 Apr 2022 13:30:43 +0200 From: Ivan Vecera <ivecera@...hat.com> To: Tony Nguyen <anthony.l.nguyen@...el.com> Cc: Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Fei Liu <feliu@...hat.com>, <netdev@...r.kernel.org>, <mschmidt@...hat.com>, Brett Creeley <brett@...sando.io>, open list <linux-kernel@...r.kernel.org>, "moderated list:INTEL ETHERNET DRIVERS" <intel-wired-lan@...ts.osuosl.org>, Jakub Kicinski <kuba@...nel.org>, "Paolo Abeni" <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net> Subject: Re: [Intel-wired-lan] [PATCH net] ice: Protect vf_state check by cfg_lock in ice_vc_process_vf_msg() On Fri, 15 Apr 2022 13:55:06 -0700 Tony Nguyen <anthony.l.nguyen@...el.com> wrote: > >>> diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl.c b/drivers/net/ethernet/intel/ice/ice_virtchnl.c > >>> index 5612c032f15a..553287a75b50 100644 > >>> --- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c > >>> +++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c > >>> @@ -3625,44 +3625,39 @@ void ice_vc_process_vf_msg(struct ice_pf *pf, struct ice_rq_event_info *event) > >>> return; > >>> } > >>> > >>> + mutex_lock(&vf->cfg_lock); > >>> + > >>> /* Check if VF is disabled. */ > >>> if (test_bit(ICE_VF_STATE_DIS, vf->vf_states)) { > >>> err = -EPERM; > >>> - goto error_handler; > >>> - } > >>> - > >>> - ops = vf->virtchnl_ops; > >>> - > >>> - /* Perform basic checks on the msg */ > >>> - err = virtchnl_vc_validate_vf_msg(&vf->vf_ver, v_opcode, msg, msglen); > >>> - if (err) { > >>> - if (err == VIRTCHNL_STATUS_ERR_PARAM) > >>> - err = -EPERM; > >>> - else > >>> - err = -EINVAL; > >>> + } else { > >>> + /* Perform basic checks on the msg */ > >>> + err = virtchnl_vc_validate_vf_msg(&vf->vf_ver, v_opcode, msg, > >>> + msglen); > >>> + if (err) { > >>> + if (err == VIRTCHNL_STATUS_ERR_PARAM) > >>> + err = -EPERM; > >>> + else > >>> + err = -EINVAL; > >>> + } > >> The chunk above feels a bit like unnecessary churn, no? > >> Couldn't this patch be simply focused only on extending critical section? > > Agree, this doesn't seem related to the fix. > > Thanks, > > Tony Yes, it is not directly related but it's just a conversion of following snippet to avoid ugly and unnecessary 'goto': if (A) { err = ... goto error_handler; } if (B) { err = ... ... } if (err) { ... } to if (A) { err = ... } else { if (B) { ... } } if (err) { ... } If you want to leave the code as is and remove this from the patch let me know and I will send v2. Thanks, Ivan
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