[PATCH v6 22/23] phy: rockchip: usbdp: Hold mutex in DP PHY configure

[Sebastian Reichel]

rk_udphy_dp_phy_configure() accesses some variables from the struct
rk_udphy, which are updated independently from the USB-C framework.

The USB-C mux/orientation switch functions already hold a mutex to
ensure mutual exclusive access to the struct rk_udphy states, so
simply hold the same one in the DP PHY configuration function.

Reproducing problems due to this on real hardware would be really hard,
but could be possible when quickly re-connecting the USB-C connector.

Fixes: 2f70bbddeb45 ("phy: rockchip: add usbdp combo phy driver")
Reported-by: Sashiko <sashiko-bot at kernel.org>
Closes: https://lore.kernel.org/linux-phy/20260612164627.23D391F000E9@smtp.kernel.org/
Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
 drivers/phy/rockchip/phy-rockchip-usbdp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-usbdp.c b/drivers/phy/rockchip/phy-rockchip-usbdp.c
index 7f26b74cb515..8c59c50f207e 100644
--- a/drivers/phy/rockchip/phy-rockchip-usbdp.c
+++ b/drivers/phy/rockchip/phy-rockchip-usbdp.c
@@ -1183,6 +1183,8 @@ static int rk_udphy_dp_phy_configure(struct phy *phy,
 	u32 i, val, lane;
 	int ret;
 
+	guard(mutex)(&udphy->mutex);
+
 	if (dp->set_rate) {
 		ret = rk_udphy_dp_phy_verify_link_rate(udphy, dp);
 		if (ret)

-- 
2.53.0