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dmaengine: virt-dma: Add synchronization helper function
Add a synchronize helper function for the virt-dma library. The function makes sure that any scheduled descriptor complete callbacks have finished running before the function returns. This needs to be called by drivers using virt-dma in their device_synchronize() callback. Depending on the driver additional operations might be necessary in addition to calling vchan_synchronize() to ensure proper synchronization. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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@ -151,4 +151,17 @@ static inline void vchan_free_chan_resources(struct virt_dma_chan *vc)
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vchan_dma_desc_free_list(vc, &head);
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}
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/**
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* vchan_synchronize() - synchronize callback execution to the current context
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* @vc: virtual channel to synchronize
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*
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* Makes sure that all scheduled or active callbacks have finished running. For
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* proper operation the caller has to ensure that no new callbacks are scheduled
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* after the invocation of this function started.
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*/
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static inline void vchan_synchronize(struct virt_dma_chan *vc)
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{
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tasklet_kill(&vc->task);
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}
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#endif
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