This is a note to let you know that I've just added the patch titled
ice: don't allow to run ice_send_event_to_aux() in atomic ctx
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ice-don-t-allow-to-run-ice_send_event_to_aux-in-atom.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a38009bec61c391c57f5012b4ecc3c29f3b9b28c
Author: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
Date: Wed Mar 23 13:43:53 2022 +0100
ice: don't allow to run ice_send_event_to_aux() in atomic ctx
[ Upstream commit 5a3156932da06f09953764de113419f254086faf ]
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 <alexandr.lobakin@xxxxxxxxx>
Tested-by: Michal Kubiak <michal.kubiak@xxxxxxxxx>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Acked-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/intel/ice/ice_idc.c b/drivers/net/ethernet/intel/ice/ice_idc.c
index adcc9a251595..a2714988dd96 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;
