From 5a3156932da06f09953764de113419f254086faf Mon Sep 17 00:00:00 2001 From: Alexander Lobakin Date: Wed, 23 Mar 2022 13:43:53 +0100 Subject: [PATCH] ice: don't allow to run ice_send_event_to_aux() in atomic ctx ice_send_event_to_aux() eventually descends to mutex_lock() (-> might_sched()), so it must not be called under non-task context. However, at least two fixes have happened already for the bug splats occurred due to this function being called from atomic context. To make the emergency landings softer, bail out early when executed in non-task context emitting a warn splat only once. This way we trade some events being potentially lost for system stability and avoid any related hangs and crashes. Fixes: 348048e724a0e ("ice: Implement iidc operations") Signed-off-by: Alexander Lobakin Tested-by: Michal Kubiak Reviewed-by: Maciej Fijalkowski Acked-by: Tony Nguyen Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/intel/ice/ice_idc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/intel/ice/ice_idc.c b/drivers/net/ethernet/intel/ice/ice_idc.c index fc3580167e7b5..5559230eff8b5 100644 --- a/drivers/net/ethernet/intel/ice/ice_idc.c +++ b/drivers/net/ethernet/intel/ice/ice_idc.c @@ -34,6 +34,9 @@ void ice_send_event_to_aux(struct ice_pf *pf, struct iidc_event *event) { struct iidc_auxiliary_drv *iadrv; + if (WARN_ON_ONCE(!in_task())) + return; + if (!pf->adev) return; -- 2.39.5