[PATCH] powerpc/powernv: Fix BE PE number to opal_pci_eeh_freeze_clear()
gwshan at linux.vnet.ibm.com
Tue Aug 2 09:59:16 AEST 2016
On Mon, Aug 01, 2016 at 08:50:58PM +1000, Michael Ellerman wrote:
>Gavin Shan <gwshan at linux.vnet.ibm.com> writes:
>> The PE number (@frozen_pe_no), filled by opal_pci_next_error() is
>> in big-endian format. Frozen PE number in CPU-endian should be passed
>> to opal_pci_eeh_freeze_clear() when clearing the frozen state if the
>> PE is invalid one.
>> This passes CPU-endian PE number to opal_pci_eeh_freeze_clear() and
>> it should be part of commit <0f36db77643b> ("powerpc/eeh: Fix wrong
>> printed PE number").
>Which commit added the broken usage?
>Looks like 2a485ad7c88d ("powerpc/powernv: Drop PHB operation
It is commit 71b540adffd9 ("powerpc/powernv: Don't escalate non-existing frozen PE").
As commit 0f36db77643b was merged to 4.3 kernel and the changes included in this
patch should be part of the commit. It's why I marked this with 4.3+
>> Cc: stable at vger.kernel.org # v4.3+
>> Suggested-by: Paul Mackerras <paulus at samba.org>
>> Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
>> arch/powerpc/platforms/powernv/eeh-powernv.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
>> index 86544ea..75363d9 100644
>> --- a/arch/powerpc/platforms/powernv/eeh-powernv.c
>> +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
>> @@ -1538,7 +1538,7 @@ static int pnv_eeh_next_error(struct eeh_pe **pe)
>> /* Try best to clear it */
>> - frozen_pe_no,
>> + be64_to_cpu(frozen_pe_no),
>Sparse knew about this:
> arch/powerpc/platforms/powernv/eeh-powernv.c:1541:41: warning: incorrect type in argument 2 (different base types)
> arch/powerpc/platforms/powernv/eeh-powernv.c:1541:41: expected unsigned long long [unsigned] [usertype] pe_number
> arch/powerpc/platforms/powernv/eeh-powernv.c:1541:41: got restricted __be64 [addressable] [usertype] frozen_pe_no
Ok, thanks. I never run sparse before and I will learn from you how to run it.
>And finds some other problems in that file:
> arch/powerpc/platforms/powernv/eeh-powernv.c:875:23: warning: constant 0x8000000000000000 is so big it is unsigned long
> arch/powerpc/platforms/powernv/eeh-powernv.c:1309:21: warning: restricted __be16 degrades to integer
Ok. I will fix it with separate patches.
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