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spi: lantiq-ssc: Fix warning by using WQ_MEM_RECLAIM 

[ Upstream commit ba3548cf29 ]

The lantiq-ssc driver uses internally an own workqueue to wait till the
data is not only written out of the FIFO but really written to the wire.
This workqueue is flushed while the SPI subsystem is working in some
other system workqueue.

The system workqueue is marked as WQ_MEM_RECLAIM, but the workqueue in
the lantiq-ssc driver does not use WQ_MEM_RECLAIM for now. Add this flag
too to prevent this warning.

This fixes the following warning:
[    2.975956] WARNING: CPU: 1 PID: 17 at kernel/workqueue.c:2614 check_flush_dependency+0x168/0x184
[    2.984752] workqueue: WQ_MEM_RECLAIM kblockd:blk_mq_run_work_fn is flushing !WQ_MEM_RECLAIM 1e100800.spi:0x0

Fixes: 891b7c5fbf ("mtd_blkdevs: convert to blk-mq")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Link: https://lore.kernel.org/r/20200717215648.20522-1-hauke@hauke-m.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Hauke Mehrtens 2020-07-17 23:56:48 +02:00 committed by Greg Kroah-Hartman
parent 7e206d89e1
commit 278b532dfe
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-lantiq-ssc.c
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@ -917,7 +917,7 @@ static int lantiq_ssc_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 8) |
SPI_BPW_MASK(16) | SPI_BPW_MASK(32);
spi->wq = alloc_ordered_workqueue(dev_name(dev), 0);
spi->wq = alloc_ordered_workqueue(dev_name(dev), WQ_MEM_RECLAIM);
if (!spi->wq) {
err = -ENOMEM;
goto err_clk_put;