Messages in this thread Patch in this message | | | From | Radhey Shyam Pandey <> | Subject | [PATCH -next 6/8] dmaengine: xilinx_dma: Print debug message when no free tx segments | Date | Thu, 5 Sep 2019 22:07:02 +0530 |
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From: Nicholas Graumann <nick.graumann@gmail.com>
The driver should not run out of tx segments in normal operation. But, if the user attempts to prepare a transaction with a large sg list, the driver may not have enough free segments to accommodate the request.
Log a message at the debug level to inform the user in case they are experiencing issues.
Signed-off-by: Nicholas Graumann <nick.graumann@gmail.com> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com> --- drivers/dma/xilinx/xilinx_dma.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c index bf3fa2e..b5dd62a 100644 --- a/drivers/dma/xilinx/xilinx_dma.c +++ b/drivers/dma/xilinx/xilinx_dma.c @@ -612,6 +612,9 @@ xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan) } spin_unlock_irqrestore(&chan->lock, flags); + if (!segment) + dev_dbg(chan->dev, "Could not find free tx segment\n"); + return segment; } -- 2.7.4
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