linux-kernel - [PATCH 5.12 564/700] staging: mmal-vchiq: Fix incorrect static vchiq

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Message-Id: <20210712061036.196461063@linuxfoundation.org>
Date:   Mon, 12 Jul 2021 08:10:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 564/700] staging: mmal-vchiq: Fix incorrect static vchiq_instance.

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

[ Upstream commit afc023da53e46b88552822f2fe035c7129c505a2 ]

For some reason lost in history function vchiq_mmal_init used
a static variable for storing the vchiq_instance.
This value is retrieved from vchiq per instance, so worked fine
until you try to call vchiq_mmal_init multiple times concurrently
when things then go wrong. This seemed to happen quite frequently
if using the cutdown firmware (no MMAL or VCSM services running)
as the vchiq_connect then failed, and one or other vchiq_shutdown
was working on an invalid handle.

Remove the static so that each caller gets a unique vchiq_instance.

Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Link: https://lore.kernel.org/r/1621979857-26754-1-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
index 9097bcbd67d8..d697ea55a0da 100644
--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
@@ -1862,7 +1862,7 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
 	int status;
 	int err = -ENODEV;
 	struct vchiq_mmal_instance *instance;
-	static struct vchiq_instance *vchiq_instance;
+	struct vchiq_instance *vchiq_instance;
 	struct vchiq_service_params_kernel params = {
 		.version		= VC_MMAL_VER,
 		.version_min		= VC_MMAL_MIN_VER,
-- 
2.30.2