diff mbox series

[3/4] usb: typec: tipd: declare in_data in as const in exec_cmd functions

Message ID 20231207-tps6598x_update-v1-3-dc21b5301d91@wolfvision.net (mailing list archive)
State Superseded
Headers show
Series usb: typec: tipd: add patch update support for tps6598x | expand

Commit Message

Javier Carrasco Dec. 7, 2023, 11:51 a.m. UTC 
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@wolfvision.net>
---
 drivers/usb/typec/tipd/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 165a1391dc72..cd5214c9799e 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,