On Fri, 2015-12-18 at 17:18 +0000, 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 There are options also for DMA Engine such as CONFIG_DMADEVICES_DEBUG > -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- 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
