From d941b5877a4eaef367ca48325c22d2e1bd8e8619 Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@ideasonboard.com>
Date: Thu, 20 Jun 2024 23:10:42 +0100
Subject: [PATCH] staging: vc04_services: vchiq_arm: Fix initialisation check
The vchiq_state used to be obtained through an accessor which would
validate that the VCHIQ had been initialised correctly with the remote,
or return a null state.
In commit 42a2f6664e18 ("staging: vc04_services: Move global g_state to
vchiq_state") the global state was moved to the vchiq_mgnt structures
stored as a vchiq instance specific context. This conversion removed the
helpers and instead replaced users of this helper with the assumption
that the state is always available and the remote connected.
The conversion does ensure that the state is always available, so some
remaining state null pointer checks that remain are unnecessary, but the
assumption that the remote is present and initialised is incorrect.
Fix this broken assumption by re-introducing the logic that was lost
during the conversion.
Fixes: 42a2f6664e18 ("staging: vc04_services: Move global g_state to vchiq_state")
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Link: https://lore.kernel.org/r/20240620221046.2731704-1-kieran.bingham@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
.../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 4 ++--
.../staging/vc04_services/interface/vchiq_arm/vchiq_core.h | 5 +++++
.../staging/vc04_services/interface/vchiq_arm/vchiq_dev.c | 7 ++++++-
3 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index 69daeba974f2d..5f518e5a92739 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -707,7 +707,7 @@ int vchiq_initialise(struct vchiq_state *state, struct vchiq_instance **instance
* block forever.
*/
for (i = 0; i < VCHIQ_INIT_RETRIES; i++) {
- if (state)
+ if (vchiq_remote_initialised(state))
break;
usleep_range(500, 600);
}
@@ -1202,7 +1202,7 @@ void vchiq_dump_platform_instances(struct vchiq_state *state, struct seq_file *f
{
int i;
- if (!state)
+ if (!vchiq_remote_initialised(state))
return;
/*
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
index 8af209e34fb2c..382ec08f6a140 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
@@ -413,6 +413,11 @@ struct vchiq_state {
struct opaque_platform_state *platform_state;
};
+static inline bool vchiq_remote_initialised(const struct vchiq_state *state)
+{
+ return state->remote && state->remote->initialised;
+}
+
struct bulk_waiter {
struct vchiq_bulk *bulk;
struct completion event;
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
index 3c63347d2d087..430f2ed2ccd3b 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
@@ -1170,6 +1170,11 @@ static int vchiq_open(struct inode *inode, struct file *file)
dev_dbg(state->dev, "arm: vchiq open\n");
+ if (!vchiq_remote_initialised(state)) {
+ dev_dbg(state->dev, "arm: vchiq has no connection to VideoCore\n");
+ return -ENOTCONN;
+ }
+
instance = kzalloc(sizeof(*instance), GFP_KERNEL);
if (!instance)
return -ENOMEM;
@@ -1200,7 +1205,7 @@ static int vchiq_release(struct inode *inode, struct file *file)
dev_dbg(state->dev, "arm: instance=%p\n", instance);
- if (!state) {
+ if (!vchiq_remote_initialised(state)) {
ret = -EPERM;
goto out;
}
--
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