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Jz4740 PCM driver: check whether pcm_callback_for_more isn't NULL (fixes metronome)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22072 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-07-27 17:00:26 +00:00
parent 8ef07c8a2f
commit 86ef57b975
1 changed files with 5 additions and 3 deletions
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6
firmware/target/mips/ingenic_jz47xx/pcm-jz4740.c
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@ -81,11 +81,13 @@ static inline void set_dma(const void *addr, size_t size)
static inline void play_dma_callback(void) static inline void play_dma_callback(void)
{ {
unsigned char *start; unsigned char *start = NULL;
size_t size = 0; size_t size = 0;
if(pcm_callback_for_more)
pcm_callback_for_more(&start, &size); pcm_callback_for_more(&start, &size);
if(LIKELY(size > 0)) if(LIKELY(size > 0 && start))
{ {
set_dma(start, size); set_dma(start, size);
REG_DMAC_DCCSR(DMA_AIC_TX_CHANNEL) |= DMAC_DCCSR_EN; REG_DMAC_DCCSR(DMA_AIC_TX_CHANNEL) |= DMAC_DCCSR_EN;