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| author |   Sanjay R Mehta <sanju.mehta@amd.com> | 2022-02-02 09:14:39 -0600 |
|---|---|---|
| committer |   Vinod Koul <vkoul@kernel.org> | 2022-02-15 10:54:54 +0530 |
| commit | 6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f (patch) | |
| tree | b6c7cc353fef1bc5733ceb71e4e6a43e863e7cff /drivers/dma | |
| parent | dt-bindings: dma: rz-dmac: Document RZ/G2UL SoC (diff) | |
| download | wireguard-linux-6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f.tar.xz wireguard-linux-6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f.zip | |
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 <sanju.mehta@amd.com>
Link: https://lore.kernel.org/r/1643814880-3882-2-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/ptdma/ptdma-dmaengine.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-dmaengine.c index c9e52f6f2f50..e38dca422391 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); } |