net: eth: davicnci_cpdma: check dma map error

Since the DMA mapping may fail the caller should check the return value.

Cc: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index 49dfd592ac1ecd4e0a86d8d5ad01572a97e5c346..053c84fd085313d4bd6487a62a33f17e812cc28b 100644 (file)
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -705,6 +705,13 @@ int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
        }
 
        buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
+       ret = dma_mapping_error(ctlr->dev, buffer);
+       if (ret) {
+               cpdma_desc_free(ctlr->pool, desc, 1);
+               ret = -EINVAL;
+               goto unlock_ret;
+       }
+
        mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
        cpdma_desc_to_port(chan, mode, directed);