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powerpc/powernv: Fix corrupted PE allocation bitmap on releasing PE 

In pnv_ioda_free_pe(), the PE object (including the associated PE
number) is cleared before resetting the corresponding bit in the
PE allocation bitmap. It means PE#0 is always released to the bitmap
wrongly.

This fixes above issue by caching the PE number before the PE object
is cleared.

Fixes: 1e9167726c ("powerpc/powernv: Use PE instead of number during setup and release"
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Gavin Shan 2016-09-06 14:17:18 +10:00 committed by Michael Ellerman
parent b314427a52
commit caa58f8088
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -162,11 +162,12 @@ static struct pnv_ioda_pe *pnv_ioda_alloc_pe(struct pnv_phb *phb)
static void pnv_ioda_free_pe(struct pnv_ioda_pe *pe)
{
struct pnv_phb *phb = pe->phb;
unsigned int pe_num = pe->pe_number;
WARN_ON(pe->pdev);
memset(pe, 0, sizeof(struct pnv_ioda_pe));
clear_bit(pe->pe_number, phb->ioda.pe_alloc);
clear_bit(pe_num, phb->ioda.pe_alloc);
}
/* The default M64 BAR is shared by all PEs */