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>
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@ -979,6 +979,10 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
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priv->tx_dma_use = 1;
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priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
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if (!priv->sg_tx_p) {
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dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
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return 0;
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}
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sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
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sg = priv->sg_tx_p;
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