handle when CONFIG_SERIAL_UART_ARCH_IOCTL is not enabled
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@ -871,14 +871,17 @@ static int u16550_ioctl(struct file *filep, int cmd, unsigned long arg)
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struct inode *inode = filep->f_inode;
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struct uart_dev_s *dev = inode->i_private;
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struct u16550_s *priv = (FAR struct u16550_s *)dev->priv;
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int ret;
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#ifdef CONFIG_SERIAL_UART_ARCH_IOCTL
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int ret = uart_ioctl(filep, cmd, arg);
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ret = uart_ioctl(filep, cmd, arg);
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if (ret != -ENOTTY)
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{
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return ret;
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}
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#else
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ret = OK;
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#endif
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switch (cmd)
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