| Message ID | 20210406135009.1707-1-lushenming@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v1] vfio/type1: Remove the almost unused check in vfio_iommu_type1_unpin_pages | expand |
On Tue, 6 Apr 2021 21:50:09 +0800 Shenming Lu <lushenming@huawei.com> wrote: > The check i > npage at the end of vfio_iommu_type1_unpin_pages is unused > unless npage < 0, but if npage < 0, this function will return npage, which > should return -EINVAL instead. So let's just check the parameter npage at > the start of the function. By the way, replace unpin_exit with break. > > Signed-off-by: Shenming Lu <lushenming@huawei.com> > --- > drivers/vfio/vfio_iommu_type1.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c > index 45cbfd4879a5..fd4213c41743 100644 > --- a/drivers/vfio/vfio_iommu_type1.c > +++ b/drivers/vfio/vfio_iommu_type1.c > @@ -960,7 +960,7 @@ static int vfio_iommu_type1_unpin_pages(void *iommu_data, > bool do_accounting; > int i; > > - if (!iommu || !user_pfn) > + if (!iommu || !user_pfn || npage <= 0) > return -EINVAL; > > /* Supported for v2 version only */ > @@ -977,13 +977,13 @@ static int vfio_iommu_type1_unpin_pages(void *iommu_data, > iova = user_pfn[i] << PAGE_SHIFT; > dma = vfio_find_dma(iommu, iova, PAGE_SIZE); > if (!dma) > - goto unpin_exit; > + break; > + > vfio_unpin_page_external(dma, iova, do_accounting); > } > > -unpin_exit: > mutex_unlock(&iommu->lock); > - return i > npage ? npage : (i > 0 ? i : -EINVAL); > + return i > 0 ? i : -EINVAL; > } > > static long vfio_sync_unpin(struct vfio_dma *dma, struct vfio_domain *domain, Very odd behavior previously. Applied to vfio next branch for v5.13. Thanks, Alex
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 45cbfd4879a5..fd4213c41743 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -960,7 +960,7 @@ static int vfio_iommu_type1_unpin_pages(void *iommu_data, bool do_accounting; int i; - if (!iommu || !user_pfn) + if (!iommu || !user_pfn || npage <= 0) return -EINVAL; /* Supported for v2 version only */ @@ -977,13 +977,13 @@ static int vfio_iommu_type1_unpin_pages(void *iommu_data, iova = user_pfn[i] << PAGE_SHIFT; dma = vfio_find_dma(iommu, iova, PAGE_SIZE); if (!dma) - goto unpin_exit; + break; + vfio_unpin_page_external(dma, iova, do_accounting); } -unpin_exit: mutex_unlock(&iommu->lock); - return i > npage ? npage : (i > 0 ? i : -EINVAL); + return i > 0 ? i : -EINVAL; } static long vfio_sync_unpin(struct vfio_dma *dma, struct vfio_domain *domain,
The check i > npage at the end of vfio_iommu_type1_unpin_pages is unused unless npage < 0, but if npage < 0, this function will return npage, which should return -EINVAL instead. So let's just check the parameter npage at the start of the function. By the way, replace unpin_exit with break. Signed-off-by: Shenming Lu <lushenming@huawei.com> --- drivers/vfio/vfio_iommu_type1.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)