From: Dan Carpenter <dan.carpenter@linaro.org>
To: Qiu-ji Chen <chenqiuji666@gmail.com>
Cc: Sean Wang <sean.wang@mediatek.com>, Vinod Koul <vkoul@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH] dmaengine: mediatek: Re-enable IRQs in mtk_cqdma_tx_status()
Date: Fri, 23 May 2025 19:06:54 +0300 [thread overview]
Message-ID: <aDCdHh-G2ShU6uid@stanley.mountain> (raw)
This code calls spin_lock_irqsave() twice but obviously we can't store
two sets of flags in the same "flags" variable. The result is that we
never re-enable IRQs in mtk_cqdma_tx_status().
Fixes: 157ae5ffd76a ("dmaengine: mediatek: Fix a possible deadlock error in mtk_cqdma_tx_status()")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
drivers/dma/mediatek/mtk-cqdma.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/mediatek/mtk-cqdma.c b/drivers/dma/mediatek/mtk-cqdma.c
index 47c8adfdc155..9f0c41ca7770 100644
--- a/drivers/dma/mediatek/mtk-cqdma.c
+++ b/drivers/dma/mediatek/mtk-cqdma.c
@@ -449,9 +449,9 @@ static enum dma_status mtk_cqdma_tx_status(struct dma_chan *c,
return ret;
spin_lock_irqsave(&cvc->pc->lock, flags);
- spin_lock_irqsave(&cvc->vc.lock, flags);
+ spin_lock(&cvc->vc.lock);
vd = mtk_cqdma_find_active_desc(c, cookie);
- spin_unlock_irqrestore(&cvc->vc.lock, flags);
+ spin_unlock(&cvc->vc.lock);
spin_unlock_irqrestore(&cvc->pc->lock, flags);
if (vd) {
--
2.47.2
reply other threads:[~2025-05-23 16:06 UTC|newest]
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