diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2017-11-14 15:32:10 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2017-12-04 18:03:51 +0100 |
| commit | 397c59bce6cbda05dc862b691e15ac2ef0ba1948 (patch) | |
| tree | a8c6cf73e3c18df6436cd35c19e828bf91f8e67a /drivers/dma | |
| parent | dmaengine: amba-pl08x: Use vchan_terminate_vdesc() instead of desc_free (diff) | |
| download | linux-397c59bce6cbda05dc862b691e15ac2ef0ba1948.tar.xz linux-397c59bce6cbda05dc862b691e15ac2ef0ba1948.zip | |
dmaengine: img-mdc-dma: Use vchan_terminate_vdesc() instead of desc_free
To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/img-mdc-dma.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c index 0391f930aecc..25cec9c243e1 100644 --- a/drivers/dma/img-mdc-dma.c +++ b/drivers/dma/img-mdc-dma.c @@ -694,7 +694,6 @@ static unsigned int mdc_get_new_events(struct mdc_chan *mchan) static int mdc_terminate_all(struct dma_chan *chan) { struct mdc_chan *mchan = to_mdc_chan(chan); - struct mdc_tx_desc *mdesc; unsigned long flags; LIST_HEAD(head); @@ -703,21 +702,28 @@ static int mdc_terminate_all(struct dma_chan *chan) mdc_chan_writel(mchan, MDC_CONTROL_AND_STATUS_CANCEL, MDC_CONTROL_AND_STATUS); - mdesc = mchan->desc; - mchan->desc = NULL; + if (mchan->desc) { + vchan_terminate_vdesc(&mchan->desc->vd); + mchan->desc = NULL; + } vchan_get_all_descriptors(&mchan->vc, &head); mdc_get_new_events(mchan); spin_unlock_irqrestore(&mchan->vc.lock, flags); - if (mdesc) - mdc_desc_free(&mdesc->vd); vchan_dma_desc_free_list(&mchan->vc, &head); return 0; } +static void mdc_synchronize(struct dma_chan *chan) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + + vchan_synchronize(&mchan->vc); +} + static int mdc_slave_config(struct dma_chan *chan, struct dma_slave_config *config) { @@ -952,6 +958,7 @@ static int mdc_dma_probe(struct platform_device *pdev) mdma->dma_dev.device_tx_status = mdc_tx_status; mdma->dma_dev.device_issue_pending = mdc_issue_pending; mdma->dma_dev.device_terminate_all = mdc_terminate_all; + mdma->dma_dev.device_synchronize = mdc_synchronize; mdma->dma_dev.device_config = mdc_slave_config; mdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); |