Anton Vorontsov wrote:
The driver should pass a device that specifies internal DMA ops, but substream->pcm is just a logical device, and thus doesn't have arch- specific dma callbacks, therefore following bug appears:
Freescale Synchronous Serial Interface (SSI) ASoC Driver ------------[ cut here ]------------ kernel BUG at arch/powerpc/include/asm/dma-mapping.h:237! Oops: Exception in kernel mode, sig: 5 [#1] ... NIP [c02259c4] snd_malloc_dev_pages+0x58/0xac LR [c0225c74] snd_dma_alloc_pages+0xf8/0x108 Call Trace: [df02bde0] [df02be2c] 0xdf02be2c (unreliable) [df02bdf0] [c0225c74] snd_dma_alloc_pages+0xf8/0x108 [df02be10] [c023a100] fsl_dma_new+0x68/0x124 [df02be20] [c02342ac] soc_new_pcm+0x1bc/0x234 [df02bea0] [c02343dc] snd_soc_new_pcms+0xb8/0x148 [df02bed0] [c023824c] cs4270_probe+0x34/0x124 [df02bef0] [c0232fe8] snd_soc_instantiate_card+0x1a4/0x2f4 [df02bf20] [c0233164] snd_soc_instantiate_cards+0x2c/0x68 [df02bf30] [c0234704] snd_soc_register_platform+0x60/0x80 [df02bf50] [c03d5664] fsl_soc_platform_init+0x18/0x28 ...
This patch fixes the issue by using card's device instead.
Signed-off-by: Anton Vorontsov avorontsov@ru.mvista.com
Acked-by: Timur Tabi timur@freescale.com
Mark and Takashi: this patch is a must-fix for 2.6.30