linux-kernel - [PATCH 10/16] staging: vchiq_core: don't add a wmb() before remote_event

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20181114125942.25163-11-nsaenzjulienne@suse.de>
Date:   Wed, 14 Nov 2018 13:59:36 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     stefan.wahren@...e.com, eric@...olt.net,
        dave.stevenson@...pberrypi.org
Cc:     linux-rpi-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: [PATCH 10/16] staging: vchiq_core: don't add a wmb() before remote_event_signal()

It's the first thing remote_event_signal() does.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 .../staging/vc04_services/interface/vchiq_arm/vchiq_core.c    | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
index 8b23ea5322e8..5791c2b670fa 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -1137,9 +1137,6 @@ queue_message_sync(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
 			size);
 	}
 
-	/* Make sure the new header is visible to the peer. */
-	wmb();
-
 	remote_event_signal(&state->remote->sync_trigger);
 
 	if (VCHIQ_MSG_TYPE(msgid) != VCHIQ_MSG_PAUSE)
@@ -3269,7 +3266,6 @@ static void
 release_message_sync(VCHIQ_STATE_T *state, VCHIQ_HEADER_T *header)
 {
 	header->msgid = VCHIQ_MSGID_PADDING;
-	wmb();
 	remote_event_signal(&state->remote->sync_release);
 }
 
-- 
2.19.1