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Blackfin: reject NULL callback in set_dma_callback()
It makes no sense to call this function with a NULL callback. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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parent
f69b2d7e97
commit
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1 changed files with 10 additions and 11 deletions
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@ -138,21 +138,20 @@ EXPORT_SYMBOL(request_dma);
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int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data)
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{
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BUG_ON(channel >= MAX_DMA_CHANNELS ||
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int ret;
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unsigned int irq;
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BUG_ON(channel >= MAX_DMA_CHANNELS || !callback ||
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!atomic_read(&dma_ch[channel].chan_status));
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if (callback != NULL) {
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int ret;
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unsigned int irq = channel2irq(channel);
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ret = request_irq(irq, callback, IRQF_DISABLED,
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dma_ch[channel].device_id, data);
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irq = channel2irq(channel);
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ret = request_irq(irq, callback, 0, dma_ch[channel].device_id, data);
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if (ret)
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return ret;
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dma_ch[channel].irq = irq;
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dma_ch[channel].data = data;
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}
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return 0;
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}
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EXPORT_SYMBOL(set_dma_callback);
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