The SNAPSHOT_PMOPS and SNAPSHOT_S2RAM ioctls can Oops if they are called from
a kernel that doesn't set pm_ops (eg. non-ACPI kernel on a PC). Fix it.
Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Pavel Machek <[email protected]>
---
kernel/power/user.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
Index: linux-2.6.20-rc6-mm3/kernel/power/user.c
===================================================================
--- linux-2.6.20-rc6-mm3.orig/kernel/power/user.c 2007-02-04 18:36:21.000000000 +0100
+++ linux-2.6.20-rc6-mm3/kernel/power/user.c 2007-02-04 18:56:53.000000000 +0100
@@ -341,6 +341,11 @@ static int snapshot_ioctl(struct inode *
break;
case SNAPSHOT_S2RAM:
+ if (!pm_ops) {
+ error = -ENOSYS;
+ break;
+ }
+
if (!data->frozen) {
error = -EPERM;
break;
@@ -383,8 +388,12 @@ static int snapshot_ioctl(struct inode *
switch (arg) {
case PMOPS_PREPARE:
- data->platform_suspend = 1;
- error = 0;
+ if (pm_ops && pm_ops->enter) {
+ data->platform_suspend = 1;
+ error = 0;
+ } else {
+ error = -ENOSYS;
+ }
break;
case PMOPS_ENTER:
-
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