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| author | Masahiro Yamada <masahiroy@kernel.org> | 2022-06-06 13:53:53 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 18:11:58 +0200 |
| commit | 6a90a44d53428a3bf01bd80df9ba78b19959270c (patch) | |
| tree | 6412df2c4e2b6311ce49224941689e46cdf1def3 | |
| parent | 978dcc55cf3603ce8f6ad240ac856973844fcc70 (diff) | |
| download | linux-stable-6a90a44d53428a3bf01bd80df9ba78b19959270c.tar.gz linux-stable-6a90a44d53428a3bf01bd80df9ba78b19959270c.tar.bz2 linux-stable-6a90a44d53428a3bf01bd80df9ba78b19959270c.zip | |
net: mdio: unexport __init-annotated mdio_bus_init()
[ Upstream commit 35b42dce619701f1300fb8498dae82c9bb1f0263 ]
EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.
modpost used to detect it, but it has been broken for a decade.
Recently, I fixed modpost so it started to warn it again, then this
showed up in linux-next builds.
There are two ways to fix it:
- Remove __init
- Remove EXPORT_SYMBOL
I chose the latter for this case because the only in-tree call-site,
drivers/net/phy/phy_device.c is never compiled as modular.
(CONFIG_PHYLIB is boolean)
Fixes: 90eff9096c01 ("net: phy: Allow splitting MDIO bus/device support from PHYs")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/phy/mdio_bus.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index b0a439248ff6..05c24db507a2 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -753,7 +753,6 @@ int __init mdio_bus_init(void) return ret; } -EXPORT_SYMBOL_GPL(mdio_bus_init); #if IS_ENABLED(CONFIG_PHYLIB) void mdio_bus_exit(void) |