Revert "serial: 8250_dma: don't bother DMA with small transfers"

This reverts commit 9119fba0cfeda6d415c9f068df66838a104b87cb.

This commit prevents from sending "big" file using Bluetooth.
When sending a lot of data quickly through the Bluetooth interface, and
after a variable amount of data sent, transfer fails with error:
    kernel: [  415.247453] Bluetooth: hci0 hardware error 0x00

Found on T100TA.

After reverting this commit, send works fine for any file size.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Fixes: 9119fba0cfed (serial: 8250_dma: don't bother DMA with small transfers)
Cc: stable@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 21d01a491405..e508939daea3 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -80,10 +80,6 @@ int serial8250_tx_dma(struct uart_8250_port *p)
                 return 0;
 
         dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
-        if (dma->tx_size < p->port.fifosize) {
-                ret = -EINVAL;
-                goto err;
-        }
 
         desc = dmaengine_prep_slave_single(dma->txchan,
                                            dma->tx_addr + xmit->tail,