* [PATCH RFT net-next] net: phylib: ensure phy device drivers do not match by DT
@ 2021-09-30 14:54 Russell King (Oracle)
2021-10-04 12:00 ` Andrew Lunn
0 siblings, 1 reply; 2+ messages in thread
From: Russell King (Oracle) @ 2021-09-30 14:54 UTC (permalink / raw)
To: Andrew Lunn, Heiner Kallweit; +Cc: David S. Miller, netdev, Jakub Kicinski
PHYLIB device drivers must match by either numerical PHY ID or by their
.match_phy_device method. Matching by DT is not permitted.
Link: https://lore.kernel.org/r/2b1dc053-8c9a-e3e4-b450-eecdfca3fe16@gmail.com
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
Tested locally in SolidRun Clearfog, DSA switch and PHY get probed
correctly. Further testing welcomed.
drivers/net/phy/phy_device.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index ba5ad86ec826..ba295b8ad8fe 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3146,6 +3146,16 @@ int phy_driver_register(struct phy_driver *new_driver, struct module *owner)
return -EINVAL;
}
+ /* PHYLIB device drivers must not match using a DT compatible table
+ * as this bypasses our checks that the mdiodev that is being matched
+ * is backed by a struct phy_device. If such a case happens, we will
+ * make out-of-bounds accesses and lockup in phydev->lock.
+ */
+ if (WARN(new_driver->mdiodrv.driver.of_match_table,
+ "%s: driver must not provide a DT match table\n",
+ new_driver->name))
+ return -EINVAL;
+
new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY;
new_driver->mdiodrv.driver.name = new_driver->name;
new_driver->mdiodrv.driver.bus = &mdio_bus_type;
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH RFT net-next] net: phylib: ensure phy device drivers do not match by DT
2021-09-30 14:54 [PATCH RFT net-next] net: phylib: ensure phy device drivers do not match by DT Russell King (Oracle)
@ 2021-10-04 12:00 ` Andrew Lunn
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Lunn @ 2021-10-04 12:00 UTC (permalink / raw)
To: Russell King (Oracle)
Cc: Heiner Kallweit, David S. Miller, netdev, Jakub Kicinski
On Thu, Sep 30, 2021 at 03:54:49PM +0100, Russell King (Oracle) wrote:
> PHYLIB device drivers must match by either numerical PHY ID or by their
> .match_phy_device method. Matching by DT is not permitted.
>
> Link: https://lore.kernel.org/r/2b1dc053-8c9a-e3e4-b450-eecdfca3fe16@gmail.com
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
^ permalink raw reply [flat|nested] 2+ messages in thread
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