2021-05-07 07:52:04

by Chanho Park

Subject: [PATCH] dmaengine: pl330: fix wrong usage of spinlock flags in dma_cyclc

From: Bumyong Lee <[email protected]>

flags varible which is the input parameter of pl330_prep_dma_cyclic()
should not be used by spinlock_irq[save/restore] function.

Signed-off-by: Jongho Park <[email protected]>
Signed-off-by: Bumyong Lee <[email protected]>
Signed-off-by: Chanho Park <[email protected]>
---
drivers/dma/pl330.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index fd8d2bc3be9f..110de8a60058 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2694,13 +2694,15 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
for (i = 0; i < len / period_len; i++) {
desc = pl330_get_desc(pch);
if (!desc) {
+ unsigned long iflags;
+
dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
__func__, __LINE__);

if (!first)
return NULL;

- spin_lock_irqsave(&pl330->pool_lock, flags);
+ spin_lock_irqsave(&pl330->pool_lock, iflags);

while (!list_empty(&first->node)) {
desc = list_entry(first->node.next,
@@ -2710,7 +2712,7 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(

list_move_tail(&first->node, &pl330->desc_pool);

- spin_unlock_irqrestore(&pl330->pool_lock, flags);
+ spin_unlock_irqrestore(&pl330->pool_lock, iflags);

return NULL;
}
--
2.31.1

2021-05-10 16:12:19

by Vinod Koul

Subject: Re: [PATCH] dmaengine: pl330: fix wrong usage of spinlock flags in dma_cyclc

On 07-05-21, 15:36, Chanho Park wrote:
> From: Bumyong Lee <[email protected]>
>
> flags varible which is the input parameter of pl330_prep_dma_cyclic()
> should not be used by spinlock_irq[save/restore] function.

It should mention Fixes. I have added that and cced stable

Thanks

--
~Vinod