mirror of https://github.com/hak5/openwrt.git
59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
From 8a4ce18b5f3ca5570666284a3a0208534dd41c26 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Wed, 23 Mar 2016 14:16:25 +0000
|
|
Subject: [PATCH 210/423] vchiq_arm: Access the dequeue_pending flag locked
|
|
|
|
Reading through this code looking for another problem (now found in userland)
|
|
the use of dequeue_pending outside a lock didn't seem safe.
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
.../misc/vc04_services/interface/vchiq_arm/vchiq_arm.c | 17 ++++++++++++-----
|
|
1 file changed, 12 insertions(+), 5 deletions(-)
|
|
|
|
--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
|
|
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
|
|
@@ -279,6 +279,7 @@ service_callback(VCHIQ_REASON_T reason,
|
|
USER_SERVICE_T *user_service;
|
|
VCHIQ_SERVICE_T *service;
|
|
VCHIQ_INSTANCE_T instance;
|
|
+ int skip_completion = 0;
|
|
DEBUG_INITIALISE(g_state.local)
|
|
|
|
DEBUG_TRACE(SERVICE_CALLBACK_LINE);
|
|
@@ -345,9 +346,6 @@ service_callback(VCHIQ_REASON_T reason,
|
|
user_service->msg_queue[user_service->msg_insert &
|
|
(MSG_QUEUE_SIZE - 1)] = header;
|
|
user_service->msg_insert++;
|
|
- spin_unlock(&msg_queue_spinlock);
|
|
-
|
|
- up(&user_service->insert_event);
|
|
|
|
/* If there is a thread waiting in DEQUEUE_MESSAGE, or if
|
|
** there is a MESSAGE_AVAILABLE in the completion queue then
|
|
@@ -356,13 +354,22 @@ service_callback(VCHIQ_REASON_T reason,
|
|
if (((user_service->message_available_pos -
|
|
instance->completion_remove) >= 0) ||
|
|
user_service->dequeue_pending) {
|
|
- DEBUG_TRACE(SERVICE_CALLBACK_LINE);
|
|
user_service->dequeue_pending = 0;
|
|
- return VCHIQ_SUCCESS;
|
|
+ skip_completion = 1;
|
|
}
|
|
|
|
+ spin_unlock(&msg_queue_spinlock);
|
|
+
|
|
+ up(&user_service->insert_event);
|
|
+
|
|
header = NULL;
|
|
}
|
|
+
|
|
+ if (skip_completion) {
|
|
+ DEBUG_TRACE(SERVICE_CALLBACK_LINE);
|
|
+ return VCHIQ_SUCCESS;
|
|
+ }
|
|
+
|
|
DEBUG_TRACE(SERVICE_CALLBACK_LINE);
|
|
|
|
return add_completion(instance, reason, header, user_service,
|