[ 06/23] [Suspend2] Disable usermode helper invocations when the freezer is on.

[Nigel Cunningham <nigel@suspend2.net>]

Disable usermode helper invocations when the freezer is on. This avoids
deadlocks due to hotplug events occuring while processes are frozen.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/kmod.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 51a8920..12afa2c 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -36,6 +36,7 @@
 #include <linux/mount.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/freezer.h>
 #include <asm/uaccess.h>
 
 extern int max_threads;
@@ -249,6 +250,9 @@ int call_usermodehelper_keys(char *path,
 	if (!khelper_wq)
 		return -EBUSY;
 
+	if (freezer_is_on())
+		return 0;
+
 	if (path[0] == '\0')
 		return 0;
 

--
Nigel Cunningham		nigel at suspend2 dot net
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