diff options
author | Loic Poulain <loic.poulain@linaro.org> | 2021-02-24 10:49:51 +0100 |
---|---|---|
committer | Loic Poulain <loic.poulain@linaro.org> | 2021-03-05 13:40:56 +0100 |
commit | 042436632938d1d76da0d7a9d828d007119c7f1a (patch) | |
tree | 419a0f2e35cda1cbf1268065b3052f8359349d33 | |
parent | 728ff1feafb7d26b831e80fefdd15b0edb135e20 (diff) |
mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue
A recent change created a dedicated workqueue for the state-change work
with WQ_HIGHPRI (no strong reason for that) and WQ_MEM_RECLAIM flags,
but the state-change work (mhi_pm_st_worker) does not guarantee forward
progress under memory pressure, and will even wait on various memory
allocations when e.g. creating devices, loading firmware, etc... The
work is then not part of a memory reclaim path...
Moreover, this causes a warning in check_flush_dependency() since we end
up in code that flushes a non-reclaim workqueue:
[ 40.969601] workqueue: WQ_MEM_RECLAIM mhi_hiprio_wq:mhi_pm_st_worker [mhi] is flushing !WQ_MEM_RECLAIM events_highpri:flush_backlog
[ 40.969612] WARNING: CPU: 4 PID: 158 at kernel/workqueue.c:2607 check_flush_dependency+0x11c/0x140
[ 40.969733] Call Trace:
[ 40.969740] __flush_work+0x97/0x1d0
[ 40.969745] ? wake_up_process+0x15/0x20
[ 40.969749] ? insert_work+0x70/0x80
[ 40.969750] ? __queue_work+0x14a/0x3e0
[ 40.969753] flush_work+0x10/0x20
[ 40.969756] rollback_registered_many+0x1c9/0x510
[ 40.969759] unregister_netdevice_queue+0x94/0x120
[ 40.969761] unregister_netdev+0x1d/0x30
[ 40.969765] mhi_net_remove+0x1a/0x40 [mhi_net]
[ 40.969770] mhi_driver_remove+0x124/0x250 [mhi]
[ 40.969776] device_release_driver_internal+0xf0/0x1d0
[ 40.969778] device_release_driver+0x12/0x20
[ 40.969782] bus_remove_device+0xe1/0x150
[ 40.969786] device_del+0x17b/0x3e0
[ 40.969791] mhi_destroy_device+0x9a/0x100 [mhi]
[ 40.969796] ? mhi_unmap_single_use_bb+0x50/0x50 [mhi]
[ 40.969799] device_for_each_child+0x5e/0xa0
[ 40.969804] mhi_pm_st_worker+0x921/0xf50 [mhi]
Fixes: 8f7039787687 ("bus: mhi: core: Move to using high priority workqueue")
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
-rw-r--r-- | drivers/bus/mhi/core/init.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 32eb90fd8470..03ddd6eaf66c 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -890,8 +890,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, INIT_WORK(&mhi_cntrl->st_worker, mhi_pm_st_worker); init_waitqueue_head(&mhi_cntrl->state_event); - mhi_cntrl->hiprio_wq = alloc_ordered_workqueue - ("mhi_hiprio_wq", WQ_MEM_RECLAIM | WQ_HIGHPRI); + mhi_cntrl->hiprio_wq = alloc_ordered_workqueue("mhi_hiprio_wq", WQ_HIGHPRI); if (!mhi_cntrl->hiprio_wq) { dev_err(mhi_cntrl->cntrl_dev, "Failed to allocate workqueue\n"); ret = -ENOMEM; |