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Blackfin: reject NULL callback in set_dma_callback()

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It makes no sense to call this function with a NULL callback.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-11-24 18:36:36 +00:00
parent f69b2d7e97
commit e34132f40b
1 changed files with 10 additions and 11 deletions
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21
arch/blackfin/kernel/bfin_dma_5xx.c
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@ -138,21 +138,20 @@ EXPORT_SYMBOL(request_dma);
int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data) int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data)
{ {
BUG_ON(channel >= MAX_DMA_CHANNELS || int ret;
unsigned int irq;
BUG_ON(channel >= MAX_DMA_CHANNELS || !callback ||
!atomic_read(&dma_ch[channel].chan_status)); !atomic_read(&dma_ch[channel].chan_status));
if (callback != NULL) { irq = channel2irq(channel);
int ret; ret = request_irq(irq, callback, 0, dma_ch[channel].device_id, data);
unsigned int irq = channel2irq(channel); if (ret)
return ret;
ret = request_irq(irq, callback, IRQF_DISABLED, dma_ch[channel].irq = irq;
dma_ch[channel].device_id, data); dma_ch[channel].data = data;
if (ret)
return ret;
dma_ch[channel].irq = irq;
dma_ch[channel].data = data;
}
return 0; return 0;
} }
EXPORT_SYMBOL(set_dma_callback); EXPORT_SYMBOL(set_dma_callback);