[PATCH 4.14 54/88] dmaengine: pl330: fix wrong usage of spinlock flags in dma_cyclc

Sasha Levin
2021-06-28T15:11:24Z

From: Bumyong Lee <bumyong.lee@samsung.com>

commit 4ad5dd2d7876d79507a20f026507d1a93b8fff10 upstream.

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 <jongho7.park@samsung.com>
Signed-off-by: Bumyong Lee <bumyong.lee@samsung.com>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20210507063647.111209-1-chanho61.park@samsung.com
Fixes: f6f2421c0a1c ("dmaengine: pl330: Merge dma_pl330_dmac and pl330_dmac structs")
Cc: stable@vger.kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 c034f506e015..a8cea236099a 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2563,13 +2563,15 @@ 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,
@@ -2579,7 +2581,7 @@ 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;
}
--
2.30.2