From: Nicholas Graumann <[email protected]> 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 <[email protected]> Signed-off-by: Radhey Shyam Pandey <[email protected]> --- 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
