From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:47219 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756693AbbKFTWe (ORCPT ); Fri, 6 Nov 2015 14:22:34 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Frederic Danis , Heikki Krogerus , Andy Shevchenko Subject: [PATCH 4.2 071/110] Revert "serial: 8250_dma: dont bother DMA with small transfers" Date: Fri, 6 Nov 2015 11:19:18 -0800 Message-Id: <20151106191707.457649860@linuxfoundation.org> In-Reply-To: <20151106191703.247930828@linuxfoundation.org> References: <20151106191703.247930828@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: stable-owner@vger.kernel.org List-ID: 4.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Frederic Danis commit f967fc8f165fadb72166f2bd4785094b3ca21307 upstream. 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 Fixes: 9119fba0cfed (serial: 8250_dma: don't bother DMA with small transfers) Reviewed-by: Heikki Krogerus Acked-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dma.c | 4 ---- 1 file changed, 4 deletions(-) --- 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_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,