[-next,6/8] dmaengine: xilinx_dma: Print debug message when no free tx segments
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Message ID 1567701424-25658-7-git-send-email-radhey.shyam.pandey@xilinx.com
State Changes Requested
Headers show
  • AXI DMA driver improvements
Related show

Commit Message

Radhey Shyam Pandey Sept. 5, 2019, 4:37 p.m. UTC
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(+)

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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;