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List: dmaengine
Subject: [PATCH] dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback
From: Raag Jadav <raagjadav () gmail ! com>
Date: 2019-06-29 8:32:48
Message-ID: 1561796448-3321-1-git-send-email-raagjadav () gmail ! com
[Download RAW message or body]
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>
---
drivers/dma/at_xdmac.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 627ef3e..b58ac72 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1568,11 +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)
--
2.7.4
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