[PATCH] uniput - fix crash on SMP

Only signal completion after marking request slot as free, otherwise other
processor can free request structure before we finish using it.

Signed-off-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index d5c5b32045af4d7cc6a4a95ddca785975a28dc4f..4015a91f4b6e7bcc0a17089f155ebb36233ce16d 100644 (file)
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -90,11 +90,11 @@ static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct
 
 static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
 {
-       complete(&request->done);
-
        /* Mark slot as available */
        udev->requests[request->id] = NULL;
        wake_up_interruptible(&udev->requests_waitq);
+
+       complete(&request->done);
 }
 
 static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)