From 3a2a5d6f2b0b9875c35abce30447e666fd219599 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Date: Thu, 29 Jul 2021 12:28:03 +0200
Subject: mei: constify passed buffers and structures
Git-commit: 0912ef4855e8e463a8d724efd6bee08e9b5d3f1e
Patch-mainline: v5.15-rc1
References: jsc#PED-1218
Buffers and structures passed to MEI bus and client API can be made
const for safer code and clear indication that it is not modified.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210729102803.46289-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/misc/mei/bus.c | 18 +++++++++---------
drivers/misc/mei/client.h | 2 +-
drivers/misc/mei/mei_dev.h | 2 +-
include/linux/mei_cl_bus.h | 9 +++++----
4 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 3bf2bb4fd152..44bac4ad687c 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -31,7 +31,7 @@
*
* Return: written size bytes or < 0 on error
*/
-ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag,
+ssize_t __mei_cl_send(struct mei_cl *cl, const u8 *buf, size_t length, u8 vtag,
unsigned int mode)
{
struct mei_device *bus;
@@ -232,8 +232,8 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag,
* * < 0 on error
*/
-ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
- u8 vtag)
+ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, const u8 *buf,
+ size_t length, u8 vtag)
{
struct mei_cl *cl = cldev->cl;
@@ -296,7 +296,7 @@ EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock_vtag);
* * written size in bytes
* * < 0 on error
*/
-ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+ssize_t mei_cldev_send(struct mei_cl_device *cldev, const u8 *buf, size_t length)
{
return mei_cldev_send_vtag(cldev, buf, length, 0);
}
@@ -552,7 +552,7 @@ EXPORT_SYMBOL_GPL(mei_cldev_ver);
*
* Return: true if me client is initialized and connected
*/
-bool mei_cldev_enabled(struct mei_cl_device *cldev)
+bool mei_cldev_enabled(const struct mei_cl_device *cldev)
{
return mei_cl_is_connected(cldev->cl);
}
@@ -771,8 +771,8 @@ EXPORT_SYMBOL_GPL(mei_cldev_disable);
* Return: id on success; NULL if no id is matching
*/
static const
-struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
- struct mei_cl_driver *cldrv)
+struct mei_cl_device_id *mei_cl_device_find(const struct mei_cl_device *cldev,
+ const struct mei_cl_driver *cldrv)
{
const struct mei_cl_device_id *id;
const uuid_le *uuid;
@@ -815,8 +815,8 @@ struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
*/
static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
{
- struct mei_cl_device *cldev = to_mei_cl_device(dev);
- struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
+ const struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ const struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
const struct mei_cl_device_id *found_id;
if (!cldev)
diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
index b12cdcde9436..418056fb1489 100644
--- a/drivers/misc/mei/client.h
+++ b/drivers/misc/mei/client.h
@@ -160,7 +160,7 @@ int mei_cl_vt_support_check(const struct mei_cl *cl);
*
* Return: true if the host client is connected
*/
-static inline bool mei_cl_is_connected(struct mei_cl *cl)
+static inline bool mei_cl_is_connected(const struct mei_cl *cl)
{
return cl->state == MEI_FILE_CONNECTED;
}
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index b7b6ef344e80..694f866f87ef 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -356,7 +356,7 @@ struct mei_hw_ops {
/* MEI bus API*/
void mei_cl_bus_rescan_work(struct work_struct *work);
void mei_cl_bus_dev_fixup(struct mei_cl_device *dev);
-ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag,
+ssize_t __mei_cl_send(struct mei_cl *cl, const u8 *buf, size_t length, u8 vtag,
unsigned int mode);
ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag,
unsigned int mode, unsigned long timeout);
diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h
index 07f5ef8fc456..c6786c12b207 100644
--- a/include/linux/mei_cl_bus.h
+++ b/include/linux/mei_cl_bus.h
@@ -91,12 +91,13 @@ void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv);
mei_cldev_driver_register,\
mei_cldev_driver_unregister)
-ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length);
+ssize_t mei_cldev_send(struct mei_cl_device *cldev, const u8 *buf,
+ size_t length);
ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length);
ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
size_t length);
-ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
- u8 vtag);
+ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, const u8 *buf,
+ size_t length, u8 vtag);
ssize_t mei_cldev_recv_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
u8 *vtag);
ssize_t mei_cldev_recv_nonblock_vtag(struct mei_cl_device *cldev, u8 *buf,
@@ -114,6 +115,6 @@ void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data);
int mei_cldev_enable(struct mei_cl_device *cldev);
int mei_cldev_disable(struct mei_cl_device *cldev);
-bool mei_cldev_enabled(struct mei_cl_device *cldev);
+bool mei_cldev_enabled(const struct mei_cl_device *cldev);
#endif /* _LINUX_MEI_CL_BUS_H */
--
2.39.0