From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri, 18 Mar 2016 14:24:54 +0000 (+0200)
Subject: dmaengine: dw: set cdesc to NULL when free cyclic transfers
X-Git-Tag: v4.7-rc1~74^2~29
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=925a7d045e6f0129bc58ccd4c3a8dcef62486345;p=karo-tx-linux.git

dmaengine: dw: set cdesc to NULL when free cyclic transfers

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@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index a6d96f32f4f9..dd47d4b8aad6 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1522,6 +1522,8 @@ 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);