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| author | Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> | 2017-05-16 01:09:16 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2017-05-19 11:25:23 +0200 |
| commit | 30c45005a46bf55ba52086da5e090ec5a2f1c949 (patch) | |
| tree | b816d40c7ed9baa351bcca0b50d48c22f3b6066f /drivers/dma/sh | |
| parent | dmaengine: rcar-dmac: store channel IRQ in struct rcar_dmac_chan (diff) | |
| download | linux-30c45005a46bf55ba52086da5e090ec5a2f1c949.tar.xz linux-30c45005a46bf55ba52086da5e090ec5a2f1c949.zip | |
dmaengine: rcar-dmac: implement device_synchronize()
Implement the device_synchronize() callback which wait until a dma
channel is stopped to provide a synchronization point.
This protects the driver from multiple race conditions when terminating
and freeing resources. E.g. the completion callback still running after
device_terminate_all() has completed.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/sh')
| -rw-r--r-- | drivers/dma/sh/rcar-dmac.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index c68c3336bdad..fb07cd5fe77b 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -1365,6 +1365,13 @@ done: spin_unlock_irqrestore(&rchan->lock, flags); } +static void rcar_dmac_device_synchronize(struct dma_chan *chan) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + + synchronize_irq(rchan->irq); +} + /* ----------------------------------------------------------------------------- * IRQ handling */ @@ -1846,6 +1853,7 @@ static int rcar_dmac_probe(struct platform_device *pdev) engine->device_terminate_all = rcar_dmac_chan_terminate_all; engine->device_tx_status = rcar_dmac_tx_status; engine->device_issue_pending = rcar_dmac_issue_pending; + engine->device_synchronize = rcar_dmac_device_synchronize; ret = dma_async_device_register(engine); if (ret < 0) |