From 4dd2cc9b91ecb25f278a2c55e07e6455e9000e6b Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Sat, 22 Apr 2023 01:21:14 +0100 Subject: [PATCH] net: phy: realtek: make sure paged read is protected by mutex As we cannot rely on phy_read_paged function before the PHY is identified, the paged read in rtlgen_supports_2_5gbps needs to be open coded as it is being called by the match_phy_device function, ie. before .read_page and .write_page have been populated. Make sure it is also protected by the MDIO bus mutex and use rtl821x_write_page instead of 3 individually locked MDIO bus operations. Signed-off-by: Daniel Golle --- drivers/net/phy/realtek.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -735,9 +735,11 @@ static bool rtlgen_supports_2_5gbps(stru { int val; - phy_write(phydev, RTL821x_PAGE_SELECT, 0xa61); - val = phy_read(phydev, 0x13); - phy_write(phydev, RTL821x_PAGE_SELECT, 0); + mutex_lock(&phydev->mdio.bus->mdio_lock); + rtl821x_write_page(phydev, 0xa61); + val = __phy_read(phydev, 0x13); + rtl821x_write_page(phydev, 0); + mutex_unlock(&phydev->mdio.bus->mdio_lock); return val >= 0 && val & RTL_SUPPORTS_2500FULL; }