- Remove tty_buffer_request_room() in mxcuart_readdma_callback()
tty_insert_flip_string will call tty_buffer_request_room() in
his loop, but if we call it here, it will return 0, and we
will lost some read data.
- Remove tasklet when dma_writeback, it's will cause hci lost data
when write(tx).
since when this dma callback maybe re-order the next buffer data,
it will mess up data, make it to a direct call to perpare next
dma buffer.
Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>
32e18295d1