netdev - [PATCH 1/2] ptp: Fix type of mode parameter in ptp_ocp_dpll_mode

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Date: Mon, 02 Oct 2023 13:55:20 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
 pabeni@...hat.com, vadfed@...com
Cc: arkadiusz.kubalewski@...el.com, jiri@...nulli.us, 
 netdev@...r.kernel.org, llvm@...ts.linux.dev, patches@...ts.linux.dev, 
 Nathan Chancellor <nathan@...nel.org>, richardcochran@...il.com, 
 jonathan.lemon@...il.com
Subject: [PATCH 1/2] ptp: Fix type of mode parameter in
 ptp_ocp_dpll_mode_get()

When building with -Wincompatible-function-pointer-types-strict, a
warning designed to catch potential kCFI failures at build time rather
than run time due to incorrect function pointer types, there is a
warning due to a mismatch between the type of the mode parameter in
ptp_ocp_dpll_mode_get() vs. what the function pointer prototype for
->mode_get() in 'struct dpll_device_ops' expects.

  drivers/ptp/ptp_ocp.c:4353:14: error: incompatible function pointer types initializing 'int (*)(const struct dpll_device *, void *, enum dpll_mode *, struct netlink_ext_ack *)' with an expression of type 'int (const struct dpll_device *, void *, u32 *, struct netlink_ext_ack *)' (aka 'int (const struct dpll_device *, void *, unsigned int *, struct netlink_ext_ack *)') [-Werror,-Wincompatible-function-pointer-types-strict]
   4353 |         .mode_get = ptp_ocp_dpll_mode_get,
        |                     ^~~~~~~~~~~~~~~~~~~~~
  1 error generated.

Change the type of the mode parameter in ptp_ocp_dpll_mode_get() to
clear up the warning and avoid kCFI failures at run time.

Fixes: 09eeb3aecc6c ("ptp_ocp: implement DPLL ops")
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
To: richardcochran@...il.com
To: jonathan.lemon@...il.com
---
 drivers/ptp/ptp_ocp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 88d60a9b5731..07bc4f3de61d 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -4255,7 +4255,7 @@ static int ptp_ocp_dpll_state_get(const struct dpll_pin *pin, void *pin_priv,
 }
 
 static int ptp_ocp_dpll_mode_get(const struct dpll_device *dpll, void *priv,
-				 u32 *mode, struct netlink_ext_ack *extack)
+				 enum dpll_mode *mode, struct netlink_ext_ack *extack)
 {
 	*mode = DPLL_MODE_AUTOMATIC;
 	return 0;

-- 
2.42.0