diff options
| author | Michael Grzeschik <m.grzeschik@pengutronix.de> | 2013-09-17 15:56:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 15:42:49 -0700 |
| commit | cd8ccd534cf8782116049336a31b2476b9049ed2 (patch) | |
| tree | 4beed7c82353e85e9d3e496d97e66de3c42856c1 | |
| parent | 218118c73db0a1b9aaece4c9ae697745218c3aa5 (diff) | |
dmaengine: imx-dma: fix callback path in tasklet
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@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>
| -rw-r--r-- | drivers/dma/imx-dma.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index a265226ff62..d0f0fafff37 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -563,13 +563,11 @@ 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 descripor 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: 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, |