Date:	Fri, 18 Dec 2015 00:06:57 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Julian Margetson <runaway@...dw.ms>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel

Julian Margetson <runaway@...dw.ms> writes:

> On 12/17/2015 3:53 PM, Måns Rullgård wrote:
>> Julian Margetson <runaway@...dw.ms> writes:
>>
>>> On 12/17/2015 2:51 PM, Måns Rullgård wrote:
>>>> Julian Margetson <runaway@...dw.ms> writes:
>>>>
>>>>> On 12/17/2015 1:59 PM, Måns Rullgård wrote:
>>>>>> Julian Margetson <runaway@...dw.ms> writes:
>>>>>>
>>>>>>> I have been running my machine mostly configured for pciex1  thus with
>>>>>>> the sata_dwc disabled.
>>>>>>> The changes to sata_dwc-460ex do cause an oops.
>>>>>>> I will try to give more detailed info over this weekend .
>>>>>> The driver as is upstream would do that since it unconditionally
>>>>>> dereferences a null pointer in the probe function.  My patch fixes that
>>>>>> as a side-effect.
>>>>>>
>>>>> patching file drivers/ata/Kconfig
>>>>>
>>>>> Hunk #1 FAILED at 296.
>>>> [...]
>>>>
>>>>> root@...ian-VirtualBox:/usr/src/linux-3.18.25#
>>>> The patch is against 4.4-rc5.
>>>>
>>>   CC      drivers/ata/sata_dwc_460ex.o
>>>
>>> drivers/ata/sata_dwc_460ex.c:198:15: error: variable ‘sata_dwc_dma_dws’ has initializer but incomplete type
>>>
>>>   static struct dw_dma_slave sata_dwc_dma_dws = {
>>>                 ^
>> It builds, albeit with an unrelated warning, using the attached config.
>> Maybe there's a missing config dependency somewhere.
>>
> I am attempting to cross compile under Ubuntu 14.04 X86 in Virtualbox
> with your .config.
> 4.4.0-rc5 builds ok with no patches applied .
> Once your patch is applied it fails to build .
>
> CC      drivers/ata/sata_dwc_460ex.o
> drivers/ata/sata_dwc_460ex.c:198:15: error: variable ‘sata_dwc_dma_dws’ has initializer but incomplete type
>  static struct dw_dma_slave sata_dwc_dma_dws = {
>                ^

Bizarre.  This is what it looks like here:

mru@...corn:/tmp/linux-sata$ git status
On branch sata-dwc
nothing to commit, working directory clean
mru@...corn:/tmp/linux-sata$ git describe
v4.4-rc5
mru@...corn:/tmp/linux-sata$ sha1sum /tmp/0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch 
e300971aa483390f82de2e9120dc16e460e74feb  /tmp/0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch
mru@...corn:/tmp/linux-sata$ git am /tmp/0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch
Applying: ata: sata_dwc_460ex: use "dmas" DT property to find dma channel
mru@...corn:/tmp/linux-sata$ sha1sum .config
4e7615b8d2fa9a1c4b4ae9ffc363aefcaf3789ca  .config
mru@...corn:/tmp/linux-sata$ make ARCH=powerpc CROSS_COMPILE=powerpc64-none-linux-gnu- oldconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf  --oldconfig Kconfig
#
# configuration written to .config
#
mru@...corn:/tmp/linux-sata$ make ARCH=powerpc CROSS_COMPILE=powerpc64-none-linux-gnu- drivers/ata/sata_dwc_460ex.o
scripts/kconfig/conf  --silentoldconfig Kconfig
  CHK     include/config/kernel.release
  UPD     include/config/kernel.release
  WRAP    arch/powerpc/include/generated/asm/clkdev.h
  WRAP    arch/powerpc/include/generated/asm/div64.h
  WRAP    arch/powerpc/include/generated/asm/irq_regs.h
  WRAP    arch/powerpc/include/generated/asm/irq_work.h
  WRAP    arch/powerpc/include/generated/asm/local64.h
  WRAP    arch/powerpc/include/generated/asm/mcs_spinlock.h
  WRAP    arch/powerpc/include/generated/asm/preempt.h
  WRAP    arch/powerpc/include/generated/asm/rwsem.h
  WRAP    arch/powerpc/include/generated/asm/vtime.h
  CHK     include/generated/uapi/linux/version.h
  UPD     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  UPD     include/generated/utsrelease.h
  CC      kernel/bounds.s
  CHK     include/generated/bounds.h
  UPD     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  UPD     include/generated/timeconst.h
  CC      arch/powerpc/kernel/asm-offsets.s
  CHK     include/generated/asm-offsets.h
  UPD     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  HOSTCC  scripts/dtc/dtc.o
  HOSTCC  scripts/dtc/flattree.o
  HOSTCC  scripts/dtc/fstree.o
  HOSTCC  scripts/dtc/data.o
  HOSTCC  scripts/dtc/livetree.o
  HOSTCC  scripts/dtc/treesource.o
  HOSTCC  scripts/dtc/srcpos.o
  HOSTCC  scripts/dtc/checks.o
  HOSTCC  scripts/dtc/util.o
  SHIPPED scripts/dtc/dtc-lexer.lex.c
  SHIPPED scripts/dtc/dtc-parser.tab.h
  HOSTCC  scripts/dtc/dtc-lexer.lex.o
  SHIPPED scripts/dtc/dtc-parser.tab.c
  HOSTCC  scripts/dtc/dtc-parser.tab.o
  HOSTLD  scripts/dtc/dtc
  CC      scripts/mod/empty.o
  HOSTCC  scripts/mod/mk_elfconfig
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  CC      scripts/mod/devicetable-offsets.s
  GEN     scripts/mod/devicetable-offsets.h
  HOSTCC  scripts/mod/file2alias.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTLD  scripts/mod/modpost
  HOSTCC  scripts/kallsyms
  CC      drivers/ata/sata_dwc_460ex.o
drivers/ata/sata_dwc_460ex.c: In function 'dma_dwc_xfer_setup':
drivers/ata/sata_dwc_460ex.c:383:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  dma_addr_t addr = (dma_addr_t)&hsdev->sata_dwc_regs->dmadr;
                    ^
mru@...corn:/tmp/linux-sata$

Patch file and .config attached.

Looking into that warning, I doubt it works as is, but that's not caused
by my patch.  I can try to come up with a fix, but again, I can't test it.

-- 
Måns Rullgård

View attachment "0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch" of type "text/x-diff" (9394 bytes)

View attachment ".config" of type "text/plain" (60936 bytes)

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