linux-kernel - [PATCH 15/15] dmaengine: dw: set cdesc to NULL when free cyclic transfers

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Message-Id: <1453663322-14474-16-git-send-email-mans@mansr.com>
Date:	Sun, 24 Jan 2016 19:22:02 +0000
From:	Mans Rullgard <mans@...sr.com>
To:	Viresh Kumar <vireshk@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Cc:	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 15/15] dmaengine: dw: set cdesc to NULL when free cyclic transfers

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

To be sure we have the cyclic transfers already gone we set cdesc to NULL. It
will prevent the double free.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Mans Rullgard <mans@...sr.com>
---
 drivers/dma/dw/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index b6634adf24f9..5606deb7f060 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1480,6 +1480,8 @@ void dw_dma_cyclic_free(struct dma_chan *chan)
 	kfree(cdesc->desc);
 	kfree(cdesc);
 
+	dwc->cdesc = NULL;
+
 	clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
 }
 EXPORT_SYMBOL(dw_dma_cyclic_free);
-- 
2.7.0