From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
Vinod Koul <vkoul@kernel.org>, Sasha Levin <sashal@kernel.org>,
linux-arm-kernel@lists.infradead.org, dmaengine@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 039/114] dmaengine: at_xdmac: remove BUG_ON macro in tasklet
Date: Wed, 22 May 2019 15:29:02 -0400 [thread overview]
Message-ID: <20190522193017.26567-39-sashal@kernel.org> (raw)
In-Reply-To: <20190522193017.26567-1-sashal@kernel.org>
From: Nicolas Ferre <nicolas.ferre@microchip.com>
[ Upstream commit e2c114c06da2d9ffad5b16690abf008d6696f689 ]
Even if this case shouldn't happen when controller is properly programmed,
it's still better to avoid dumping a kernel Oops for this.
As the sequence may happen only for debugging purposes, log the error and
just finish the tasklet call.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/dma/at_xdmac.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index b222dd7afe8e2..12d9048293245 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1608,7 +1608,11 @@ static void at_xdmac_tasklet(unsigned long data)
struct at_xdmac_desc,
xfer_node);
dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
- BUG_ON(!desc->active_xfer);
+ if (!desc->active_xfer) {
+ dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting");
+ spin_unlock_bh(&atchan->lock);
+ return;
+ }
txd = &desc->tx_dma_desc;
--
2.20.1
prev parent reply other threads:[~2019-05-22 19:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190522193017.26567-1-sashal@kernel.org>
2019-05-22 19:28 ` [PATCH AUTOSEL 4.9 004/114] dmaengine: tegra210-dma: free dma controller in remove() Sasha Levin
2019-05-22 19:28 ` [PATCH AUTOSEL 4.9 019/114] dmaengine: pl330: _stop: clear interrupt status Sasha Levin
2019-05-22 19:29 ` Sasha Levin [this message]
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