Julian Margetson <runaway@xxxxxxxx> writes: > On 12/18/2015 8:49 AM, Måns Rullgård wrote: >> Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> writes: >> >>>>> [ 5.206125] Unable to handle kernel paging request for data at >>>>> address 0x00000000 >>>>> [ 5.228546] Faulting instruction address: 0xc043a2c8 >>>>> [ 5.248577] Vector: 300 (Data Access) at [eddafae0] >>>>> [ 5.268658] pc: c043a2c8: sata_dwc_qc_issue+0xb8/0x204 >>>> Well, that's not good. Can you translate that address to a line of >>>> code? >>> Besides that, can you enable DYNAMIC_DEBUG in the config and append >>> 'dw_dmac_core.dyndbg dw_dmac.dyndbg' to the kernel cmdline? >> Enabling debug messages in the sata_dwc driver might also be informative. >> > Changed the sata-dwc to a module . > > [ 18.475140] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL > [ 18.535698] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL That's strange. The only way that can happen is if dmaengine_prep_slave_sg() return NULL, and that really shouldn't be happening. Did you turn on debug messages in dw_dma? You can enable some extra debug messages by adding "#define VERBOSE_DEBUG" at the top of drivers/dma/dw/core.c -- Måns Rullgård -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
