Commit f967fc8f authored Oct 09, 2015 by Frederic Danis Committed by Greg Kroah-Hartman Oct 17, 2015

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



This reverts commit 9119fba0.

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: 9119fba0 (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>

parent 25cb62b7

drivers/tty/serial/8250/8250_dma.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -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,