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authorRaag Jadav <raagjadav@gmail.com>2019-06-29 11:20:48 +0300
committerVinod Koul <vkoul@kernel.org>2019-07-07 20:16:43 +0300
commitb7f5b656ffe19e3c65f04e3adeae21ac17227126 (patch)
treea258fa32196a092826f42d0a500725453fe5a63e /drivers/dma/at_xdmac.c
parent9dcb98a29b6e81394fa33ca984f3aaad4d0d1393 (diff)
downloadlinux-b7f5b656ffe19e3c65f04e3adeae21ac17227126.tar.xz
dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback
tx descriptor retrieved from an empty xfers_list may not have valid pointers to the callback functions. Avoid calling dmaengine_desc_get_callback_invoke if xfers_list is empty. Signed-off-by: Raag Jadav <raagjadav@gmail.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/at_xdmac.c')
-rw-r--r--drivers/dma/at_xdmac.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index e4ae2ee46d3f..84b3c6ac31cc 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1579,11 +1579,14 @@ 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)