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openSUSE:12.2:PowerPC
xen
24701-gnttab-map-grant-ref-recovery.patch
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File 24701-gnttab-map-grant-ref-recovery.patch of Package xen
# HG changeset patch # User Haoyu Zhang <haoyu.zhang@huawei.com> # Date 1328563421 28800 # Node ID 3574f4d67843733ccaabab5f8ebb859c99d7314a # Parent 5bd5830dea13f2a80a1b9728d3e61c34661fe764 Fix error recovery path in __gnttab_map_grant_ref In file grant_table.c function __gnttab_map_grant_ref, if __get_paged_frame failed, the effect of _set_status previously called should be rollback, so the flag GTF_reading and _GTF_writing will be recovered. Signed-off-by: Haoyu Zhang <haoyu.zhang@huawei.com> Signed-off-by: Liang Wang <hzwangliang.wang@huawei.com> Acked-by: Andres Lagar-Cavilla <andres@lagarcavilla.org> Committed-by: Keir Fraser <keir@xen.org> --- a/xen/common/grant_table.c +++ b/xen/common/grant_table.c @@ -566,7 +566,7 @@ __gnttab_map_grant_ref( gfn = sha1 ? sha1->frame : sha2->full_page.frame; rc = __get_paged_frame(gfn, &frame, !!(op->flags & GNTMAP_readonly), rd); if ( rc != GNTST_okay ) - goto unlock_out; + goto unlock_out_clear; act->gfn = gfn; act->domid = ld->domain_id; act->frame = frame; @@ -722,6 +722,7 @@ __gnttab_map_grant_ref( act->pin -= (op->flags & GNTMAP_readonly) ? GNTPIN_hstr_inc : GNTPIN_hstw_inc; + unlock_out_clear: if ( !(op->flags & GNTMAP_readonly) && !(act->pin & (GNTPIN_hstw_mask|GNTPIN_devw_mask)) ) gnttab_clear_flag(_GTF_writing, status);
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