diff options
| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2020-11-06 16:50:47 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-11-23 14:16:55 +0000 |
| commit | cb4789b0d19ff231ce9f73376a023341300aed96 (patch) | |
| tree | 2ca4e1bb68a04c7a9e54483ba9c17663ac1fcff2 /drivers/iommu/intel/iommu.c | |
| parent | f8394f232b1eab649ce2df5c5f15b0e528c92091 (diff) | |
| download | lwn-cb4789b0d19ff231ce9f73376a023341300aed96.tar.gz lwn-cb4789b0d19ff231ce9f73376a023341300aed96.zip | |
iommu/ioasid: Add ioasid references
Let IOASID users take references to existing ioasids with ioasid_get().
ioasid_put() drops a reference and only frees the ioasid when its
reference number is zero. It returns true if the ioasid was freed.
For drivers that don't call ioasid_get(), ioasid_put() is the same as
ioasid_free().
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20201106155048.997886-2-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/intel/iommu.c')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 1b1ca63e6bbe..8b26223979a2 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5198,7 +5198,7 @@ static void auxiliary_unlink_device(struct dmar_domain *domain, domain->auxd_refcnt--; if (!domain->auxd_refcnt && domain->default_pasid > 0) - ioasid_free(domain->default_pasid); + ioasid_put(domain->default_pasid); } static int aux_domain_add_dev(struct dmar_domain *domain, @@ -5259,7 +5259,7 @@ attach_failed: spin_unlock(&iommu->lock); spin_unlock_irqrestore(&device_domain_lock, flags); if (!domain->auxd_refcnt && domain->default_pasid > 0) - ioasid_free(domain->default_pasid); + ioasid_put(domain->default_pasid); return ret; } |