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ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal

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commit 7d64f82cceb21e6d95db312d284f5f195e120154 upstream.

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: 81e88fdc43 (ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
James Morse
2017-03-16 14:30:39 +00:00
committed by Willy Tarreau
parent 136211c284
commit 71bec91ec4
1 changed files with 1 additions and 0 deletions
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drivers/acpi/apei/ghes.c
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@@ -988,6 +988,7 @@ 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:
mutex_lock(&ghes_list_mutex);