netdev - RE: [PATCH] [V2] net: emaclite: adding MDIO and phy lib support

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Date:	Mon, 8 Feb 2010 07:09:01 -0700
From:	John Linn <John.Linn@...inx.com>
To:	"John Linn" <john.linn@...inx.com>, <netdev@...r.kernel.org>,
	<linuxppc-dev@...abs.org>, <jgarzik@...ox.com>,
	<grant.likely@...retlab.ca>, <jwboyer@...ux.vnet.ibm.com>
CC:	<john.williams@...alogix.com>,
	"Sadanand Mutyala" <sadanan@...inx.com>
Subject: RE: [PATCH] [V2] net: emaclite: adding MDIO and phy lib support

> -----Original Message-----
> From: John Linn [mailto:john.linn@...inx.com]
> Sent: Friday, February 05, 2010 3:41 PM
> To: netdev@...r.kernel.org; linuxppc-dev@...abs.org;
jgarzik@...ox.com; grant.likely@...retlab.ca;
> jwboyer@...ux.vnet.ibm.com
> Cc: john.williams@...alogix.com; John Linn; Sadanand Mutyala
> Subject: [PATCH] [V2] net: emaclite: adding MDIO and phy lib support
> 
> These changes add MDIO and phy lib support to the driver as the
> IP core now supports the MDIO bus.
> 
> The MDIO bus and phy are added as a child to the emaclite in the
device
> tree as illustrated below.
> 
> mdio {
> 	#address-cells = <1>;
> 	#size-cells = <0>;
> 	compatible = "xlnx,emaclite-mdio";
> 	phy0: phy@7 {
> 		reg = <7>;
> 	} ;
> }
> 
> Signed-off-by: Sadanand Mutyala <Sadanand.Mutyala@...inx.com>
> Signed-off-by: John Linn <john.linn@...inx.com>
> 
> ---
> 
> V2 - updated it for Grant's comments, except I couldn't find any tabs
> converted to white space issue, let's see if V2 has it also
> ---
>  drivers/net/Kconfig           |    1 +
>  drivers/net/xilinx_emaclite.c |  393
++++++++++++++++++++++++++++++++++++-----
>  2 files changed, 351 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> index dd9a09c..9509a36 100644
> --- a/drivers/net/Kconfig
> +++ b/drivers/net/Kconfig
> @@ -1939,6 +1939,7 @@ config ATL2
>  config XILINX_EMACLITE
>  	tristate "Xilinx 10/100 Ethernet Lite support"
>  	depends on PPC32 || MICROBLAZE
> +	select PHYLIB
>  	help
>  	  This driver supports the 10/100 Ethernet Lite from Xilinx.
> 
> diff --git a/drivers/net/xilinx_emaclite.c
b/drivers/net/xilinx_emaclite.c
> index 8c777ba..02f18dd 100644
> --- a/drivers/net/xilinx_emaclite.c
> +++ b/drivers/net/xilinx_emaclite.c
> @@ -22,11 +22,17 @@
> 
>  #include <linux/of_device.h>
>  #include <linux/of_platform.h>
> +#include <linux/of_mdio.h>
> +#include <linux/phy.h>
> 

<snip>

> +static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int
reg)
> +{
> +	struct net_local *lp = bus->priv;
> +	u32 ctrl_reg;
> +	u32 rc;
> +
> +	mutex_lock(&lp->mdio_mutex);
> +
> +	if (xemaclite_mdio_wait(lp))
> +		return -ETIMEDOUT;


I already see a problem with this patch as when there's a timeout
waiting for the mdio the mutex won't get unlocked.  This is true
anywhere the timeout happens (other places also).

I tested it with normal operation, but don't have a great way to test
the timeout paths.

I'll wait for other comments then spin it again to unlock the mutex when
there's a timeout.

Thanks,
John


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