Re: [PATCH 1/4] dma: ste_dma40: Maintain spinlock order while handling pause

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On 04/23/2014 11:52 PM, Ulf Hansson wrote:

The runtime PM resume callback needs to be executed while holding the
spinlock, make sure to maintain this for the pause operation as well.

Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
  drivers/dma/ste_dma40.c |    2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index bf18c78..6e97cf6 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1495,8 +1495,8 @@ static int d40_pause(struct d40_chan *d40c)
  	if (!d40c->busy)
  		return 0;

-	pm_runtime_get_sync(d40c->base->dev);
  	spin_lock_irqsave(&d40c->lock, flags);
+	pm_runtime_get_sync(d40c->base->dev);

That function may sleep AFAIK, so you can't really call it with a spinlock held. Or do I miss something?

WBR, Sergei


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