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[PATCH 3/7] gnttab: fold redundant error code paths in acquire_grant_for_copy()
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 28 Jul 2026 15:51:03 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Tue, 28 Jul 2026 13:51:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
One of the open-coded error paths of transitive grant handling is an exact
match of the code at the unlock_out_clear label. The other can be made so
by moving the put_page() earlier.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -2729,10 +2729,7 @@ acquire_grant_for_copy(
{
atomic_dec(&rgt->nr_v2_ops);
rcu_unlock_domain(td);
- reduce_status_for_pin(rd, act, status, readonly);
- active_entry_release(act);
- grant_read_unlock(rgt);
- return rc;
+ goto unlock_out_clear;
}
/*
@@ -2763,17 +2760,16 @@ acquire_grant_for_copy(
release_grant_for_copy(td, trans_gref, readonly);
rcu_unlock_domain(td);
+ put_page(*page);
+ *page = NULL;
+
grant_read_lock(rgt);
atomic_dec(&rgt->nr_v2_ops);
act = active_entry_acquire(rgt, gref);
- reduce_status_for_pin(rd, act, status, readonly);
- active_entry_release(act);
- grant_read_unlock(rgt);
- put_page(*page);
- *page = NULL;
- return ERESTART;
+ rc = ERESTART;
+ goto unlock_out_clear;
}
if ( !old_pin )
|
