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powerpc/powernv/ioda: Protect PE list 

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);