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Date: Tue, 10 Jul 2007 13:01:26 -0400
From: Jeff Garzik <jeff@...zik.org>
To: Vitaly Bordug <vitb@...nel.crashing.org>
CC: linuxppc-dev@...abs.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PHY fixed driver: rework release path and update phy_id
notation
Vitaly Bordug wrote:
> device_bind_driver() error code returning has been fixed.
> release() function has been written, so that to free resources
> in correct way; the release path is now clean.
>
> Before the rework, it used to cause
> Device 'fixed@100:1' does not have a release() function, it is broken
> and must be fixed.
> BUG: at drivers/base/core.c:104 device_release()
>
> Call Trace:
> [<ffffffff802ec380>] kobject_cleanup+0x53/0x7e
> [<ffffffff802ec3ab>] kobject_release+0x0/0x9
> [<ffffffff802ecf3f>] kref_put+0x74/0x81
> [<ffffffff8035493b>] fixed_mdio_register_device+0x230/0x265
> [<ffffffff80564d31>] fixed_init+0x1f/0x35
> [<ffffffff802071a4>] init+0x147/0x2fb
> [<ffffffff80223b6e>] schedule_tail+0x36/0x92
> [<ffffffff8020a678>] child_rip+0xa/0x12
> [<ffffffff80311714>] acpi_ds_init_one_object+0x0/0x83
> [<ffffffff8020705d>] init+0x0/0x2fb
> [<ffffffff8020a66e>] child_rip+0x0/0x12
>
>
> Also changed the notation of the fixed phy definition on
> mdio bus to the form of <speed>+<duplex> to make it able to be used by
> gianfar and ucc_geth that define phy_id strictly as "%d:%d"
>
> Signed-off-by: Vitaly Bordug <vitb@...nel.crashing.org>
>
> ---
>
> drivers/net/phy/Kconfig | 4 ++
> drivers/net/phy/fixed.c | 93 +++++++++++++++++++++++++++--------------------
> 2 files changed, 57 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 09b6f25..a938c48 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -71,4 +71,8 @@ config FIXED_MII_100_FDX
> bool "Emulation for 100M Fdx fixed PHY behavior"
> depends on FIXED_PHY
>
> +config FIXED_MII_1000_FDX
> + bool "Emulation for 1000M Fdx fixed PHY behavior"
> + depends on FIXED_PHY
> +
> endif # PHYLIB
> diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
> index 68c99b4..34b9111 100644
> --- a/drivers/net/phy/fixed.c
> +++ b/drivers/net/phy/fixed.c
> @@ -187,12 +187,29 @@ static struct phy_driver fixed_mdio_driver = {
> .driver = { .owner = THIS_MODULE,},
> };
>
> +static void fixed_mdio_release (struct device * dev)
> +{
> + struct phy_device *phydev = container_of(dev, struct phy_device, dev);
> + struct mii_bus *bus = phydev->bus;
> + struct fixed_info *fixed = bus->priv;
> +
> + kfree(phydev);
> + kfree(bus->dev);
> + kfree(bus);
> + kfree(fixed->regs);
> + kfree(fixed);
> +}
> +
> /*-----------------------------------------------------------------------------
> * This func is used to create all the necessary stuff, bind
> * the fixed phy driver and register all it on the mdio_bus_type.
> - * speed is either 10 or 100, duplex is boolean.
> + * speed is either 10 or 100 or 1000, duplex is boolean.
> * number is used to create multiple fixed PHYs, so that several devices can
> * utilize them simultaneously.
> + *
> + * The device on mdio bus will look like <bus_id>:<phy_id>,
> + * bus_id = number
> + * phy_id = speed+duplex.
> *-----------------------------------------------------------------------------*/
> static int fixed_mdio_register_device(int number, int speed, int duplex)
> {
> @@ -221,6 +238,12 @@ static int fixed_mdio_register_device(int number, int speed, int duplex)
> }
>
> fixed->regs = kzalloc(MII_REGS_NUM*sizeof(int), GFP_KERNEL);
> + if (NULL == fixed->regs) {
> + kfree(dev);
> + kfree(new_bus);
> + kfree(fixed);
> + return -ENOMEM;
> + }
> fixed->regs_num = MII_REGS_NUM;
> fixed->phy_status.speed = speed;
> fixed->phy_status.duplex = duplex;
> @@ -249,57 +272,43 @@ static int fixed_mdio_register_device(int number, int speed, int duplex)
> fixed->phydev = phydev;
>
> if(NULL == phydev) {
> - err = -ENOMEM;
> - goto device_create_fail;
> + kfree(dev);
> + kfree(new_bus);
> + kfree(fixed->regs);
> + kfree(fixed);
> + return -ENOMEM;
> }
>
> phydev->irq = PHY_IGNORE_INTERRUPT;
> phydev->dev.bus = &mdio_bus_type;
>
> - if(number)
> - snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
> - "fixed_%d@%d:%d", number, speed, duplex);
> - else
> - snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
> - "fixed@%d:%d", speed, duplex);
> + snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
> + "%d:%d", number, speed + duplex);
> +
> phydev->bus = new_bus;
>
> + phydev->dev.driver = &fixed_mdio_driver.driver;
> + phydev->dev.release = fixed_mdio_release;
> +
> + err = phydev->dev.driver->probe(&phydev->dev);
> + if(err < 0) {
> + printk(KERN_ERR "Phy %s: problems with fixed driver\n",
> + phydev->dev.bus_id);
> + kfree(phydev);
> + kfree(dev);
> + kfree(new_bus);
> + kfree(fixed->regs);
> + kfree(fixed);
> + return err;
> + }
> +
> err = device_register(&phydev->dev);
> if(err) {
> printk(KERN_ERR "Phy %s failed to register\n",
> phydev->dev.bus_id);
> - goto bus_register_fail;
> - }
use the standard 'goto' style found in the kernel, rather than repeating
all these kfree's.
-
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