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powerpc/powernv/ioda: Protect PE list

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Protect the PHB's list of PE. Probably not needed as long as it was
populated during PHB creation, but it feels right and will become
required once we can add/remove opencapi devices on hotplug.

Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191121134918.7155-3-fbarrat@linux.ibm.com
This commit is contained in:
Frederic Barrat 2019-11-21 14:49:09 +01:00 committed by Michael Ellerman
parent 05dd7da769
commit 80f1ff83fa
1 changed files with 5 additions and 1 deletions
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6
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -1087,8 +1087,9 @@ static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
}
/* Put PE to the list */
mutex_lock(&phb->ioda.pe_list_mutex);
list_add_tail(&pe->list, &phb->ioda.pe_list);
mutex_unlock(&phb->ioda.pe_list_mutex);
return pe;
}
@ -3528,7 +3529,10 @@ static void pnv_ioda_release_pe(struct pnv_ioda_pe *pe)
struct pnv_phb *phb = pe->phb;
struct pnv_ioda_pe *slave, *tmp;
mutex_lock(&phb->ioda.pe_list_mutex);
list_del(&pe->list);
mutex_unlock(&phb->ioda.pe_list_mutex);
switch (phb->type) {
case PNV_PHB_IODA1:
pnv_pci_ioda1_release_pe_dma(pe);