powerpc/powernv/ioda: Protect PE list (80f1ff83) · Commits · 戴 / test

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

arch/powerpc/platforms/powernv/pci-ioda.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -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);

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