Commit 2eed4a75 authored by Frederic Danis's avatar Frederic Danis Committed by Greg Kroah-Hartman

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

commit f967fc8f upstream.

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: default avatarFrederic Danis <frederic.danis@linux.intel.com>
Fixes: 9119fba0 (serial: 8250_dma: don't bother DMA with small transfers)
Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8104ee7b
...@@ -80,10 +80,6 @@ int serial8250_tx_dma(struct uart_8250_port *p) ...@@ -80,10 +80,6 @@ int serial8250_tx_dma(struct uart_8250_port *p)
return 0; return 0;
dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); 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, desc = dmaengine_prep_slave_single(dma->txchan,
dma->tx_addr + xmit->tail, dma->tx_addr + xmit->tail,
......
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