From: Dan Carpenter <dan.carpenter@oracle.com>
To: Shun-Chih Yu <shun-chih.yu@mediatek.com>,
Sean Wang <sean.wang@mediatek.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vkoul@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
dmaengine@vger.kernel.org, linux-mediatek@lists.infradead.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH] dmaengine: mediatek-cqdma: sleeping in atomic context
Date: Thu, 9 May 2019 13:09:23 +0300 [thread overview]
Message-ID: <20190509100923.GA7024@mwanda> (raw)
The mtk_cqdma_poll_engine_done() function takes a true/false parameter
where true means it's called from atomic context. There are a couple
places where it was set to false but it's actually in atomic context
so it should be true.
All the callers for mtk_cqdma_hard_reset() are holding a spin_lock and
in mtk_cqdma_free_chan_resources() we take a spin_lock before calling
the mtk_cqdma_poll_engine_done() function.
Fixes: b1f01e48df5a ("dmaengine: mediatek: Add MediaTek Command-Queue DMA controller for MT6765 SoC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
The "atomic" parameter is always true so the temptation was to just
remove it entirely.
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 814853842e29..723b11c190b3 100644
--- a/drivers/dma/mediatek/mtk-cqdma.c
+++ b/drivers/dma/mediatek/mtk-cqdma.c
@@ -225,7 +225,7 @@ static int mtk_cqdma_hard_reset(struct mtk_cqdma_pchan *pc)
mtk_dma_set(pc, MTK_CQDMA_RESET, MTK_CQDMA_HARD_RST_BIT);
mtk_dma_clr(pc, MTK_CQDMA_RESET, MTK_CQDMA_HARD_RST_BIT);
- return mtk_cqdma_poll_engine_done(pc, false);
+ return mtk_cqdma_poll_engine_done(pc, true);
}
static void mtk_cqdma_start(struct mtk_cqdma_pchan *pc,
@@ -671,7 +671,7 @@ static void mtk_cqdma_free_chan_resources(struct dma_chan *c)
mtk_dma_set(cvc->pc, MTK_CQDMA_FLUSH, MTK_CQDMA_FLUSH_BIT);
/* wait for the completion of flush operation */
- if (mtk_cqdma_poll_engine_done(cvc->pc, false) < 0)
+ if (mtk_cqdma_poll_engine_done(cvc->pc, true) < 0)
dev_err(cqdma2dev(to_cqdma_dev(c)), "cqdma flush timeout\n");
/* clear the flush bit and interrupt flag */
--
2.18.0
next reply other threads:[~2019-05-09 10:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-09 10:09 Dan Carpenter [this message]
2019-05-21 4:58 ` [PATCH] dmaengine: mediatek-cqdma: sleeping in atomic context Vinod Koul
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