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# Commit 498d73647fa17d9eb7a67d2e9bdccac6b438e559
# Date 2020-05-08 10:44:22 +0200
# Author Juergen Gross <jgross@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
cpupool: fix removing cpu from a cpupool
Commit cb563d7665f2 ("xen/sched: support core scheduling for moving
cpus to/from cpupools") introduced a regression when trying to remove
an offline cpu from a cpupool, as the system would crash in this
situation.
Fix that by testing the cpu to be online.
Fixes: cb563d7665f2 ("xen/sched: support core scheduling for moving cpus to/from cpupools")
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Dario Faggioli <dfaggioli@suse.com>
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -519,6 +519,9 @@ static int cpupool_unassign_cpu(struct c
debugtrace_printk("cpupool_unassign_cpu(pool=%d,cpu=%d)\n",
c->cpupool_id, cpu);
+ if ( !cpu_online(cpu) )
+ return -EINVAL;
+
master_cpu = sched_get_resource_cpu(cpu);
ret = cpupool_unassign_cpu_start(c, master_cpu);
if ( ret )
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