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authorMichael Grzeschik <m.grzeschik@pengutronix.de>2013-09-17 15:56:08 +0200
committerVinod Koul <vinod.koul@intel.com>2013-10-04 14:35:03 +0530
commitfcaaba6c7136fe47e5a13352f99a64b019b6d2c5 (patch)
treefac62a9876144fff179750d077c615cd970a3eb3
parent5a276fa6bdf82fd442046969603968c83626ce0b (diff)
downloadlinux-stericsson-fcaaba6c7136fe47e5a13352f99a64b019b6d2c5.tar.gz
dmaengine: imx-dma: fix callback path in tasklet
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@pengutronix.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
-rw-r--r--drivers/dma/imx-dma.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 247aa7cae37c..55852c026791 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -627,13 +627,11 @@ static void imxdma_tasklet(unsigned long data)
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 descriptor as complete.
* Only in non-cyclic cases it would be marked as complete
@@ -661,6 +659,10 @@ static void imxdma_tasklet(unsigned long data)
}
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,