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

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This reverts commit 9119fba0cf.

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 <[email protected]>
Fixes: 9119fba0cf (serial: 8250_dma: don't bother DMA with small transfers)
Cc: [email protected]
Reviewed-by: Heikki Krogerus <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Frederic Danis authored and Greg Kroah-Hartman committed 2015-10-17 21:24:46 -07:00
1 parent 25cb62b764
commit f967fc8f16
1 file changed
-4
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drivers/tty/serial/8250/8250_dma.c
-4
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@@ -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,