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 <[email protected]>
Signed-off-by: Jingchang Lu <[email protected]>
---
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