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authorJames Morse <james.morse@arm.com>2017-03-16 17:30:39 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 00:43:42 +0300
commit7d64f82cceb21e6d95db312d284f5f195e120154 (patch)
treee1e6b89815613fb875633fa5e86dfeb8305121f7 /drivers/acpi
parentc02ed2e75ef4c74e41e421acb4ef1494671585e8 (diff)
downloadlinux-7d64f82cceb21e6d95db312d284f5f195e120154.tar.xz
ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal
When removing a GHES device notified by SCI, list_del_rcu() is used, ghes_remove() should call synchronize_rcu() before it goes on to call kfree(ghes), otherwise concurrent RCU readers may still hold this list entry after it has been freed. Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: "Huang, Ying" <ying.huang@intel.com> Fixes: 81e88fdc432a (ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/apei/ghes.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b192b42a8351..79b3c9c5a3bc 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1073,6 +1073,7 @@ static int ghes_remove(struct platform_device *ghes_dev)
if (list_empty(&ghes_sci))
unregister_acpi_hed_notifier(&ghes_notifier_sci);
mutex_unlock(&ghes_list_mutex);
+ synchronize_rcu();
break;
case ACPI_HEST_NOTIFY_NMI:
ghes_nmi_remove(ghes);