linux-kernel - [PATCH AUTOSEL 4.4 4/9] dmaengine: mmp_tdma: Reset channel error on release

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Message-Id: <20200507143018.27195-4-sashal@kernel.org>
Date:   Thu,  7 May 2020 10:30:13 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Lubomir Rintel <lkundrak@...sk>, Vinod Koul <vkoul@...nel.org>,
        Sasha Levin <sashal@...nel.org>, dmaengine@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 4/9] dmaengine: mmp_tdma: Reset channel error on release

From: Lubomir Rintel <lkundrak@...sk>

[ Upstream commit 0c89446379218698189a47871336cb30286a7197 ]

When a channel configuration fails, the status of the channel is set to
DEV_ERROR so that an attempt to submit it fails. However, this status
sticks until the heat end of the universe, making it impossible to
recover from the error.

Let's reset it when the channel is released so that further use of the
channel with correct configuration is not impacted.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
Link: https://lore.kernel.org/r/20200419164912.670973-5-lkundrak@v3.sk
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/mmp_tdma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
index 3df0422607d59..ac9aede1bfbec 100644
--- a/drivers/dma/mmp_tdma.c
+++ b/drivers/dma/mmp_tdma.c
@@ -364,6 +364,8 @@ static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
 		gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
 				size);
 	tdmac->desc_arr = NULL;
+	if (tdmac->status == DMA_ERROR)
+		tdmac->status = DMA_COMPLETE;
 
 	return;
 }
-- 
2.20.1