* Grygorii Strashko <grygorii.strashko@xxxxxx> [170112 15:43]:
> @@ -457,38 +449,36 @@ static void push_desc_queue(struct cppi41_channel *c)
> cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));
> }
>
> -static void pending_desc(struct cppi41_channel *c)
> +static void cppi41_dma_issue_pending(struct dma_chan *chan)
> {
> + struct cppi41_channel *c = to_cpp41_chan(chan);
> struct cppi41_dd *cdd = c->cdd;
> + int error;
> + struct cppi41_channel *_c;
> unsigned long flags;
>
> spin_lock_irqsave(&cdd->lock, flags);
> list_add_tail(&c->node, &cdd->pending);
> - spin_unlock_irqrestore(&cdd->lock, flags);
> -}
> -
> -static void cppi41_dma_issue_pending(struct dma_chan *chan)
> -{
> - struct cppi41_channel *c = to_cpp41_chan(chan);
> - struct cppi41_dd *cdd = c->cdd;
> - int error;
>
> error = pm_runtime_get(cdd->ddev.dev);
> - if ((error != -EINPROGRESS) && error < 0) {
> + if (error < 0) {
> pm_runtime_put_noidle(cdd->ddev.dev);
> dev_err(cdd->ddev.dev, "Failed to pm_runtime_get: %i\n",
> error);
> -
> + spin_unlock_irqrestore(&cdd->lock, flags);
> return;
> }
>
> - if (likely(pm_runtime_active(cdd->ddev.dev)))
> - push_desc_queue(c);
> - else
> - pending_desc(c);
> + if (!cdd->is_suspended) {
> + list_for_each_entry_safe(c, _c, &cdd->pending, node) {
> + push_desc_queue(c);
> + list_del(&c->node);
> + };
> + }
>
> pm_runtime_mark_last_busy(cdd->ddev.dev);
> pm_runtime_put_autosuspend(cdd->ddev.dev);
> + spin_lock_irqsave(&cdd->lock, flags);
> }
So always add to the queue no matter, then always flush the queue
directly if active? Yeah that might work :)
Don't we need spinlock in the list_for_each_entry_safe() to prevent
it racing with runtime_resume() though?
Tony
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