pch_uart: check kzalloc result in dma_handle_tx()

Reported by coccinelle:

drivers/tty/serial/pch_uart.c:979:1-14: alloc with no test, possible model on line 994

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 558ce8509a9a..4cd6c2381528 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -979,6 +979,10 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
         priv->tx_dma_use = 1;
 
         priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
+        if (!priv->sg_tx_p) {
+                dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
+                return 0;
+        }
 
         sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
         sg = priv->sg_tx_p;