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dmaengine: imx-dma: fix callback path in tasklet

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commit fcaaba6c71 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@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Cc: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik 2013-09-17 15:56:08 +02:00 committed by Greg Kroah-Hartman
parent 218118c73d
commit cd8ccd534c
1 changed files with 6 additions and 4 deletions
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10
drivers/dma/imx-dma.c
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@ -563,13 +563,11 @@ static void imxdma_tasklet(unsigned long data)
if (list_empty(&imxdmac->ld_active)) { if (list_empty(&imxdmac->ld_active)) {
/* Someone might have called terminate all */ /* 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); 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 /* If we are dealing with a cyclic descriptor keep it on ld_active
* and dont mark the descripor as complete. * and dont mark the descripor as complete.
* Only in non-cyclic cases it would be marked as complete * Only in non-cyclic cases it would be marked as complete
@ -597,6 +595,10 @@ static void imxdma_tasklet(unsigned long data)
} }
out: out:
spin_unlock_irqrestore(&imxdma->lock, flags); 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, static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,