linux-kernel - [PATCH v2 3/4] usb: typec: tipd: declare in_data in as const in exec

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Message-Id: <20231207-tps6598x_update-v2-3-f3cfcde6d890@wolfvision.net>
Date:   Thu, 14 Dec 2023 17:29:11 +0100
From:   Javier Carrasco <javier.carrasco@...fvision.net>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH v2 3/4] usb: typec: tipd: declare in_data in as const in
 exec_cmd functions

The input data passed to execute commands with tps6598x_exec_cmd()
is not supposed to be modified by the function. Moreover, this data is
passed to tps6598x_exec_cmd_tmo() and finally to tps6598x_block_write(),
which expects a const pointer.

The current implementation does not produce any bugs, but it discards
const qualifiers from the pointers passed as arguments. This leads to
compile issues if 'discarded-qualifiers' is active and a const pointer
is passed to the function, which is the case if data from a firmware
structure is passed to execute update commands. Adding the const
modifier to in_data prevents such issues and provides code consistency.

Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
 drivers/usb/typec/tipd/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 83e5eeecdf5c..7f4bbc0629b0 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -330,7 +330,7 @@ static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
 }
 
 static int tps6598x_exec_cmd_tmo(struct tps6598x *tps, const char *cmd,
-			     size_t in_len, u8 *in_data,
+			     size_t in_len, const u8 *in_data,
 			     size_t out_len, u8 *out_data,
 			     u32 cmd_timeout_ms, u32 res_delay_ms)
 {
@@ -396,7 +396,7 @@ static int tps6598x_exec_cmd_tmo(struct tps6598x *tps, const char *cmd,
 }
 
 static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
-			     size_t in_len, u8 *in_data,
+			     size_t in_len, const u8 *in_data,
 			     size_t out_len, u8 *out_data)
 {
 	return tps6598x_exec_cmd_tmo(tps, cmd, in_len, in_data,

-- 
2.39.2