linux-kernel - [ 41/48] dmaengine: imx-dma: fix callback path in tasklet

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Message-Id: <20131011193641.698724072@linuxfoundation.org>
Date:	Fri, 11 Oct 2013 12:36:48 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Vinod Koul <vinod.koul@...el.com>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: [ 41/48] dmaengine: imx-dma: fix callback path in tasklet

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Grzeschik <m.grzeschik@...gutronix.de>

commit fcaaba6c7136fe47e5a13352f99a64b019b6d2c5 upstream.

We need to free the ld_active list head before jumping into the callback
routine. Otherwise the callback could run into issue_pending and change
our ld_active list head we just going to free. This will run the channel
list into an currupted and undefined state.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Cc: Jonghwan Choi <jhbird.choi@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/imx-dma.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -563,13 +563,11 @@ static void imxdma_tasklet(unsigned long
 
 	if (list_empty(&imxdmac->ld_active)) {
 		/* Someone might have called terminate all */
-		goto out;
+		spin_unlock_irqrestore(&imxdma->lock, flags);
+		return;
 	}
 	desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
 
-	if (desc->desc.callback)
-		desc->desc.callback(desc->desc.callback_param);
-
 	/* If we are dealing with a cyclic descriptor keep it on ld_active
 	 * and dont mark the descripor as complete.
 	 * Only in non-cyclic cases it would be marked as complete
@@ -597,6 +595,10 @@ static void imxdma_tasklet(unsigned long
 	}
 out:
 	spin_unlock_irqrestore(&imxdma->lock, flags);
+
+	if (desc->desc.callback)
+		desc->desc.callback(desc->desc.callback_param);
+
 }
 
 static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,


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