Commit 81cc6edc authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Vinod Koul

dmaengine: pl330: Fix hang on dmaengine_terminate_all on certain boards

The pl330 device could hang infinitely on certain boards when DMA
channels are terminated.

It was caused by lack of runtime resume when executing
pl330_terminate_all() which calls the _stop() function. _stop() accesses
device register and can loop infinitely while checking for device state.

The hang was confirmed by Dinh Nguyen on Altera SOCFPGA Cyclone V
board during boot. It can be also triggered with:

$ echo 1 > /sys/module/dmatest/parameters/iterations
$ echo dma1chan0 > /sys/module/dmatest/parameters/channel
$ echo 1 > /sys/module/dmatest/parameters/run
$ sleep 1
$ cat /sys/module/dmatest/parameters/run
Reported-by: default avatarDinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: ae43b328 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
Cc: <stable@vger.kernel.org>
Tested-by: default avatarDinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 5ebe6afa
......@@ -2127,6 +2127,7 @@ static int pl330_terminate_all(struct dma_chan *chan)
struct pl330_dmac *pl330 = pch->dmac;
LIST_HEAD(list);
pm_runtime_get_sync(pl330->ddma.dev);
spin_lock_irqsave(&pch->lock, flags);
spin_lock(&pl330->lock);
_stop(pch->thread);
......@@ -2151,6 +2152,8 @@ static int pl330_terminate_all(struct dma_chan *chan)
list_splice_tail_init(&pch->work_list, &pl330->desc_pool);
list_splice_tail_init(&pch->completed_list, &pl330->desc_pool);
spin_unlock_irqrestore(&pch->lock, flags);
pm_runtime_mark_last_busy(pl330->ddma.dev);
pm_runtime_put_autosuspend(pl330->ddma.dev);
return 0;
}
......
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