diff options
Diffstat (limited to 'drivers/dma/at_xdmac.c')
| -rw-r--r-- | drivers/dma/at_xdmac.c | 24 |
1 files changed, 8 insertions, 16 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index e4ae2ee46d3f..b58ac720d9a1 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -1,21 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems) * * Copyright (C) 2014 Atmel Corporation * * Author: Ludovic Desroches <ludovic.desroches@atmel.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program. If not, see <http://www.gnu.org/licenses/>. */ #include <asm/barrier.h> @@ -1579,11 +1568,14 @@ static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) struct at_xdmac_desc *desc; struct dma_async_tx_descriptor *txd; - desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); - txd = &desc->tx_dma_desc; + if (!list_empty(&atchan->xfers_list)) { + desc = list_first_entry(&atchan->xfers_list, + struct at_xdmac_desc, xfer_node); + txd = &desc->tx_dma_desc; - if (txd->flags & DMA_PREP_INTERRUPT) - dmaengine_desc_get_callback_invoke(txd, NULL); + if (txd->flags & DMA_PREP_INTERRUPT) + dmaengine_desc_get_callback_invoke(txd, NULL); + } } static void at_xdmac_handle_error(struct at_xdmac_chan *atchan) |