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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2014-08-03 19:13:07 +0200
committerVinod Koul <vinod.koul@intel.com>2014-08-04 10:00:31 +0200
commitf02323ec68328c3db3e3c23490cd80f9ce9c00fa (patch)
tree39f627314dfa617ee842a6d67a1bf96103f448b9 /drivers/dma/nbpfaxi.c
parentdmaengine: nbpfaxi: fix a theoretical race (diff)
downloadlinux-f02323ec68328c3db3e3c23490cd80f9ce9c00fa.tar.xz
linux-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/nbpfaxi.c')
-rw-r--r--drivers/dma/nbpfaxi.c19
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;