tx_dma_buf_virt 131 drivers/tty/serial/serial-tegra.c unsigned char *tx_dma_buf_virt; tx_dma_buf_virt 1112 drivers/tty/serial/serial-tegra.c tup->tx_dma_buf_virt = NULL; tx_dma_buf_virt 1164 drivers/tty/serial/serial-tegra.c tup->tx_dma_buf_virt = dma_buf;