From: Dario Faggioli <dario.faggioli@citrix.com>
Date: Thu, 7 May 2015 13:15:53 +0000 (+0200)
Subject: cpupool: assigning a CPU to a pool can fail
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~3322
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks://%22Dat/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22Dat?a=commitdiff_plain;h=d415a81b2245ac4b27f8cbf4e314449ef275333a;p=xen.git

cpupool: assigning a CPU to a pool can fail

which means such an event must be handled at the call sites
of cpupool_assign_cpu_locked(), and the error, if occurring,
properly propagated.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
---

diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index a947c245f0..cabaccd4be 100644
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -458,8 +458,10 @@ void cpupool_rm_domain(struct domain *d)
  * unless we are resuming from S3, in which case we put the cpu back
  * in the cpupool it was in prior to suspend.
  */
-static void cpupool_cpu_add(unsigned int cpu)
+static int cpupool_cpu_add(unsigned int cpu)
 {
+    int ret = -EINVAL;
+
     spin_lock(&cpupool_lock);
     cpumask_clear_cpu(cpu, &cpupool_locked_cpus);
     cpumask_set_cpu(cpu, &cpupool_free_cpus);
@@ -472,15 +474,20 @@ static void cpupool_cpu_add(unsigned int cpu)
         {
             if ( cpumask_test_cpu(cpu, (*c)->cpu_suspended ) )
             {
-                cpupool_assign_cpu_locked(*c, cpu);
+                ret = cpupool_assign_cpu_locked(*c, cpu);
+                if ( ret )
+                    goto out;
                 cpumask_clear_cpu(cpu, (*c)->cpu_suspended);
             }
         }
     }
 
     if ( cpumask_test_cpu(cpu, &cpupool_free_cpus) )
-        cpupool_assign_cpu_locked(cpupool0, cpu);
+        ret = cpupool_assign_cpu_locked(cpupool0, cpu);
+ out:
     spin_unlock(&cpupool_lock);
+
+    return ret;
 }
 
 /*
@@ -715,7 +722,7 @@ static int cpu_callback(
     {
     case CPU_DOWN_FAILED:
     case CPU_ONLINE:
-        cpupool_cpu_add(cpu);
+        rc = cpupool_cpu_add(cpu);
         break;
     case CPU_DOWN_PREPARE:
         rc = cpupool_cpu_remove(cpu);