Julian Margetson <runaway@xxxxxxxx> writes: > On 12/18/2015 1:18 PM, Måns Rullgård wrote: >> 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 >> > > [ 17.526173] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL > [ 17.600124] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL > [ 17.662978] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL Could you post the entire kernel log? There might be important information before the errors start. -- 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
