diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2015-10-20 11:46:29 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-11-16 03:58:52 +0100 |
| commit | 2ed086296e60c3ca9a63a025701f4d104f4ced85 (patch) | |
| tree | 207a0607ec8caac6657d070d5dc1033750849299 /drivers/dma | |
| parent | dmaengine: Add transfer termination synchronization support (diff) | |
| download | linux-2ed086296e60c3ca9a63a025701f4d104f4ced85.tar.xz linux-2ed086296e60c3ca9a63a025701f4d104f4ced85.zip | |
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>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/virt-dma.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h index 2fa47745a41f..edbb5751572b 100644 --- a/drivers/dma/virt-dma.h +++ b/drivers/dma/virt-dma.h @@ -151,4 +151,17 @@ static inline void vchan_free_chan_resources(struct virt_dma_chan *vc) vchan_dma_desc_free_list(vc, &head); } +/** + * vchan_synchronize() - synchronize callback execution to the current context + * @vc: virtual channel to synchronize + * + * Makes sure that all scheduled or active callbacks have finished running. For + * proper operation the caller has to ensure that no new callbacks are scheduled + * after the invocation of this function started. + */ +static inline void vchan_synchronize(struct virt_dma_chan *vc) +{ + tasklet_kill(&vc->task); +} + #endif |