On Fri, Feb 21, 2014 at 02:50:06PM +0800, Jingchang Lu wrote:
> The static checker reports following warning:
> drivers/dma/fsl-edma.c:732 fsl_edma_xlate()
> error: we previously assumed 'chan' could be null (see line 737)
> The changes of the loop cursor in the iteration may result in
> NULL dereference when dma_get_slave_channel failed but loop
> will continue. So use list_for_each_entry_safe() instead of
> list_for_each_entry() to against this.
>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Jingchang Lu <b35083@xxxxxxxxxxxxx>
Applied, thanks
--
~Vinod
> ---
> drivers/dma/fsl-edma.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
> index 9025300..381e793 100644
> --- a/drivers/dma/fsl-edma.c
> +++ b/drivers/dma/fsl-edma.c
> @@ -723,13 +723,13 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
> struct of_dma *ofdma)
> {
> struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
> - struct dma_chan *chan;
> + struct dma_chan *chan, *_chan;
>
> if (dma_spec->args_count != 2)
> return NULL;
>
> mutex_lock(&fsl_edma->fsl_edma_mutex);
> - list_for_each_entry(chan, &fsl_edma->dma_dev.channels, device_node) {
> + list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
> if (chan->client_count)
> continue;
> if ((chan->chan_id / DMAMUX_NR) == dma_spec->args[0]) {
> --
> 1.8.0
>
>
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