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[v2,-next,6/7] dmaengine: xilinx_dma: Print debug message when no free tx segments

Message ID 1571150904-3988-7-git-send-email-radhey.shyam.pandey@xilinx.com (mailing list archive)
State Accepted
Headers show
Series dmaengine: xilinx_dma: AXI DMA driver improvements | expand

Commit Message

Radhey Shyam Pandey Oct. 15, 2019, 2:48 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>
---
Changes for v2:
None
---
 drivers/dma/xilinx/xilinx_dma.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 932407a..b0d3aac 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -615,6 +615,9 @@  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;
 }