4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
commit 5c9e6c2b2ba3ec3a442e2fb5b4286498f8b4dcb7 upstream.
PL330 DMA engine driver is leaking a runtime reference after any terminated
DMA transactions. This patch fixes this issue by tracking runtime PM state
of the device and making additional call to pm_runtime_put() in terminate_all
callback if needed.
Fixes: ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/pl330.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -445,6 +445,9 @@ struct dma_pl330_chan {
/* for cyclic capability */
bool cyclic;
+
+ /* for runtime pm tracking */
+ bool active;
};
struct pl330_dmac {
@@ -1994,6 +1997,7 @@ static void pl330_tasklet(unsigned long
_stop(pch->thread);
spin_unlock(&pch->thread->dmac->lock);
power_down = true;
+ pch->active = false;
} else {
/* Make sure the PL330 Channel thread is active */
spin_lock(&pch->thread->dmac->lock);
@@ -2015,6 +2019,7 @@ static void pl330_tasklet(unsigned long
desc->status = PREP;
list_move_tail(&desc->node, &pch->work_list);
if (power_down) {
+ pch->active = true;
spin_lock(&pch->thread->dmac->lock);
_start(pch->thread);
spin_unlock(&pch->thread->dmac->lock);
@@ -2129,6 +2134,7 @@ static int pl330_terminate_all(struct dm
unsigned long flags;
struct pl330_dmac *pl330 = pch->dmac;
LIST_HEAD(list);
+ bool power_down = false;
pm_runtime_get_sync(pl330->ddma.dev);
spin_lock_irqsave(&pch->lock, flags);
@@ -2139,6 +2145,8 @@ static int pl330_terminate_all(struct dm
pch->thread->req[0].desc = NULL;
pch->thread->req[1].desc = NULL;
pch->thread->req_running = -1;
+ power_down = pch->active;
+ pch->active = false;
/* Mark all desc done */
list_for_each_entry(desc, &pch->submitted_list, node) {
@@ -2156,6 +2164,8 @@ static int pl330_terminate_all(struct dm
list_splice_tail_init(&pch->completed_list, &pl330->desc_pool);
spin_unlock_irqrestore(&pch->lock, flags);
pm_runtime_mark_last_busy(pl330->ddma.dev);
+ if (power_down)
+ pm_runtime_put_autosuspend(pl330->ddma.dev);
pm_runtime_put_autosuspend(pl330->ddma.dev);
return 0;
@@ -2302,6 +2312,7 @@ static void pl330_issue_pending(struct d
* updated on work_list emptiness status.
*/
WARN_ON(list_empty(&pch->submitted_list));
+ pch->active = true;
pm_runtime_get_sync(pch->dmac->ddma.dev);
}
list_splice_tail_init(&pch->submitted_list, &pch->work_list);
--
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