lkml.org 
[lkml]   [2017]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.2 51/95] ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal
3.2.91-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: James Morse <james.morse@arm.com>

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: 81e88fdc432a (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: Ben Hutchings <ben@decadent.org.uk>
---
drivers/acpi/apei/ghes.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -953,6 +953,7 @@ static int __devexit ghes_remove(struct
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);
\
 
 \ /
  Last update: 2017-07-16 16:51    [W:1.372 / U:1.820 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site