Commit fcaaba6c authored by Michael Grzeschik's avatar Michael Grzeschik Committed by Vinod Koul
Browse files

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: default avatarMichael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 5a276fa6
......@@ -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,
......
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