diff options
| author |   Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2014-08-03 19:13:07 +0200 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2014-08-04 13:30:31 +0530 |
| commit | f02323ec68328c3db3e3c23490cd80f9ce9c00fa (patch) | |
| tree | 39f627314dfa617ee842a6d67a1bf96103f448b9 /drivers/dma | |
| parent | dmaengine: nbpfaxi: fix a theoretical race (diff) | |
| download | linux-dev-f02323ec68328c3db3e3c23490cd80f9ce9c00fa.tar.xz linux-dev-f02323ec68328c3db3e3c23490cd80f9ce9c00fa.zip | |
dmaengine: nbpfaxi: convert to tasklet
It is common among dmaengine drivers to use a tasklet for bottom half
interrupt processing. Convert nbpfaxi to do the same.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/nbpfaxi.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/dma/nbpfaxi.c b/drivers/dma/nbpfaxi.c index 5b40ac8d82d1..cea6a3768e2e 100644 --- a/drivers/dma/nbpfaxi.c +++ b/drivers/dma/nbpfaxi.c @@ -197,6 +197,7 @@ struct nbpf_desc_page { */ struct nbpf_channel { struct dma_chan dma_chan; + struct tasklet_struct tasklet; void __iomem *base; struct nbpf_device *nbpf; char name[16]; @@ -1111,9 +1112,9 @@ static struct dma_chan *nbpf_of_xlate(struct of_phandle_args *dma_spec, return dchan; } -static irqreturn_t nbpf_chan_irqt(int irq, void *dev) +static void nbpf_chan_tasklet(unsigned long data) { - struct nbpf_channel *chan = dev; + struct nbpf_channel *chan = (struct nbpf_channel *)data; struct nbpf_desc *desc, *tmp; dma_async_tx_callback callback; void *param; @@ -1176,8 +1177,6 @@ static irqreturn_t nbpf_chan_irqt(int irq, void *dev) if (must_put) nbpf_desc_put(desc); } - - return IRQ_HANDLED; } static irqreturn_t nbpf_chan_irq(int irq, void *dev) @@ -1186,6 +1185,7 @@ static irqreturn_t nbpf_chan_irq(int irq, void *dev) bool done = nbpf_status_get(chan); struct nbpf_desc *desc; irqreturn_t ret; + bool bh = false; if (!done) return IRQ_NONE; @@ -1200,7 +1200,8 @@ static irqreturn_t nbpf_chan_irq(int irq, void *dev) ret = IRQ_NONE; goto unlock; } else { - ret = IRQ_WAKE_THREAD; + ret = IRQ_HANDLED; + bh = true; } list_move_tail(&desc->node, &chan->done); @@ -1216,6 +1217,9 @@ static irqreturn_t nbpf_chan_irq(int irq, void *dev) unlock: spin_unlock(&chan->lock); + if (bh) + tasklet_schedule(&chan->tasklet); + return ret; } @@ -1258,8 +1262,9 @@ static int nbpf_chan_probe(struct nbpf_device *nbpf, int n) snprintf(chan->name, sizeof(chan->name), "nbpf %d", n); - ret = devm_request_threaded_irq(dma_dev->dev, chan->irq, - nbpf_chan_irq, nbpf_chan_irqt, IRQF_SHARED, + tasklet_init(&chan->tasklet, nbpf_chan_tasklet, (unsigned long)chan); + ret = devm_request_irq(dma_dev->dev, chan->irq, + nbpf_chan_irq, IRQF_SHARED, chan->name, chan); if (ret < 0) return ret; |