From: Sanjay R Mehta Date: Wed, 2 Feb 2022 15:14:39 +0000 (-0600) Subject: dmaengine: ptdma: fix concurrency issue with multiple dma transfer X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f;p=linux.git dmaengine: ptdma: fix concurrency issue with multiple dma transfer The command should be submitted only if the engine is idle, for this, the next available descriptor is checked and set the flag to false in case the descriptor is non-empty. Signed-off-by: Sanjay R Mehta Link: https://lore.kernel.org/r/1643814880-3882-2-git-send-email-Sanju.Mehta@amd.com Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-dmaengine.c index c9e52f6f2f50f..e38dca4223912 100644 --- a/drivers/dma/ptdma/ptdma-dmaengine.c +++ b/drivers/dma/ptdma/ptdma-dmaengine.c @@ -233,9 +233,14 @@ static void pt_issue_pending(struct dma_chan *dma_chan) struct pt_dma_chan *chan = to_pt_chan(dma_chan); struct pt_dma_desc *desc; unsigned long flags; + bool engine_is_idle = true; spin_lock_irqsave(&chan->vc.lock, flags); + desc = pt_next_dma_desc(chan); + if (desc) + engine_is_idle = false; + vchan_issue_pending(&chan->vc); desc = pt_next_dma_desc(chan); @@ -243,7 +248,7 @@ static void pt_issue_pending(struct dma_chan *dma_chan) spin_unlock_irqrestore(&chan->vc.lock, flags); /* If there was nothing active, start processing */ - if (desc) + if (engine_is_idle) pt_cmd_callback(desc, 0); }