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Date: Wed, 23 Jul 2014 16:47:32 -0300 From: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> To: <netdev@...r.kernel.org> Cc: David Miller <davem@...emloft.net>, Florian Fainelli <f.fainelli@...il.com>, Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, Gregory Clement <gregory.clement@...e-electrons.com>, Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> Subject: [PATCH v2 2/2] net: phy: Ensure the MDIO bus module is held This commit adds proper module_{get,put} to prevent the MDIO bus module from being unloaded while the phydev is connected. By doing so, we fix a kernel panic produced when a MDIO driver is removed, but the phydev that relies on it is attached and running. Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> --- drivers/net/phy/phy_device.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 4f4568e..1a5815c 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -575,6 +575,7 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, u32 flags, phy_interface_t interface) { struct device *d = &phydev->dev; + struct module *bus_module; int err; /* Assume that if there is no driver, that it doesn't @@ -599,6 +600,14 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, return -EBUSY; } + /* Increment the bus module reference count */ + bus_module = phydev->bus->dev.driver ? + phydev->bus->dev.driver->owner : NULL; + if (!try_module_get(bus_module)) { + dev_err(&dev->dev, "failed to get the bus module\n"); + return -EIO; + } + phydev->attached_dev = dev; dev->phydev = phydev; @@ -664,6 +673,10 @@ EXPORT_SYMBOL(phy_attach); void phy_detach(struct phy_device *phydev) { int i; + + if (phydev->bus->dev.driver) + module_put(phydev->bus->dev.driver->owner); + phydev->attached_dev->phydev = NULL; phydev->attached_dev = NULL; phy_suspend(phydev); -- 2.0.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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