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authorFrederic Danis <frederic.danis@linux.intel.com>2015-10-09 17:14:56 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-17 21:24:46 -0700
commitf967fc8f165fadb72166f2bd4785094b3ca21307 (patch)
tree5464d4f7c5220bcb29a700db6984cefab204bb91 /drivers/tty
parent25cb62b76430a91cc6195f902e61c2cb84ade622 (diff)
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_dma.c4
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,