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[PATCH v4 02/21] IOMMU: simplify unmap-on-error in iommu_map()
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 25 Apr 2022 10:32:10 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 25 Apr 2022 08:32:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
As of 68a8aa5d7264 ("iommu: make map and unmap take a page count,
similar to flush") there's no need anymore to have a loop here.
Suggested-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v3: New.
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -308,11 +308,9 @@ int iommu_map(struct domain *d, dfn_t df
d->domain_id, dfn_x(dfn_add(dfn, i)),
mfn_x(mfn_add(mfn, i)), rc);
- while ( i-- )
- /* if statement to satisfy __must_check */
- if ( iommu_call(hd->platform_ops, unmap_page, d, dfn_add(dfn, i),
- flush_flags) )
- continue;
+ /* while statement to satisfy __must_check */
+ while ( iommu_unmap(d, dfn, i, flush_flags) )
+ break;
if ( !is_hardware_domain(d) )
domain_crash(d);
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