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Code Issues Releases Wiki Activity

dmaengine: xilinx_dma: Correctly handle cyclic descriptor callbacks 

DMA clients can provide one of two types of callbacks. For this reason
dmaengine drivers should not directly invoke `callback`, but always use
`dmaengine_desc_callback_invoke()`. This makes sure that both types of
callbacks are handled correctly.

The xilinx_dma driver currently doesn't do this for cyclic descriptors and
only handles the `callback` type callback. If the client used the
`callback_result` type callback it will not be called.

Fix this by switching to `dmaengine_desc_callback_valid()` and
`dmaengine_desc_callback_invoke()`.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211025075428.2094-2-lars@metafoo.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2021-10-25 09:54:27 +02:00 committed by Vinod Koul
parent a34da7ef9a
commit a63ddc3857
1 changed files with 4 additions and 6 deletions
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10
drivers/dma/xilinx/xilinx_dma.c
View File

@ -998,14 +998,12 @@ static void xilinx_dma_chan_handle_cyclic(struct xilinx_dma_chan *chan,
struct xilinx_dma_tx_descriptor *desc,
unsigned long *flags)
{
dma_async_tx_callback callback;
void *callback_param;
struct dmaengine_desc_callback cb;
callback = desc->async_tx.callback;
callback_param = desc->async_tx.callback_param;
if (callback) {
dmaengine_desc_get_callback(&desc->async_tx, &cb);
if (dmaengine_desc_callback_valid(&cb)) {
spin_unlock_irqrestore(&chan->lock, *flags);
callback(callback_param);
dmaengine_desc_callback_invoke(&cb, NULL);
spin_lock_irqsave(&chan->lock, *flags);
}
}