linux-kernel - [PATCH] dmaengine: pl330: fix wrong usage of spinlock flags in dma

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Date:   Fri,  7 May 2021 15:36:47 +0900
From:   Chanho Park <chanho61.park@...sung.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bumyong Lee <bumyong.lee@...sung.com>,
        Jongho Park <jongho7.park@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>
Subject: [PATCH] dmaengine: pl330: fix wrong usage of spinlock flags in
 dma_cyclc

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

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@...sung.com>
Signed-off-by: Bumyong Lee <bumyong.lee@...sung.com>
Signed-off-by: Chanho Park <chanho61.park@...sung.com>
---
 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