Re: [PATCH 3.3.0] phy:icplus:fix Auto Power Saving in ip101a_config_init.

[Jonathan Nieder <jrnieder@gmail.com>]

Hi Dave,

David Miller wrote:
> From: Srinivas KANDAGATLA <srinivas.kandagatla@st.com>

>> This patch fixes Auto Power Saving configuration in ip101a_config_init
>> which was broken as there is no phy register write followed after
>> setting IP101A_APS_ON flag.
>>
>> This patch also fixes the return value of ip101a_config_init.
>>
>> Without this patch ip101a_config_init returns 2 which is not an error
>> accroding to IS_ERR and the mac driver will continue accessing 2 as
>> valid pointer to phy_dev resulting in memory fault.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
>
> Applied and queued up for -stable, thanks.

I'm guessing 3.2.y needs this, too, since it also includes
v3.2-rc1~129^2~247 ("net/phy: add IC+ IP101A and support APS").

Here's a quick backport made by adjusting the context line to
use IP101A_APS_ON instead of IP101A_G_APS_ON.

Please include it in some later stable update if appropriate.

Thanks,
Jonathan

-- >8 --
From: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Date: Mon, 2 Apr 2012 00:02:09 +0000

[ Upstream commit b3300146aa8efc5d3937fd33f3cfdc580a3843bc ]

This patch fixes Auto Power Saving configuration in ip101a_config_init
which was broken as there is no phy register write followed after
setting IP101A_APS_ON flag.

This patch also fixes the return value of ip101a_config_init.

Without this patch ip101a_config_init returns 2 which is not an error
accroding to IS_ERR and the mac driver will continue accessing 2 as
valid pointer to phy_dev resulting in memory fault.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 drivers/net/phy/icplus.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/icplus.c b/drivers/net/phy/icplus.c
index c81f136ae670..b14230016d9b 100644
--- a/drivers/net/phy/icplus.c
+++ b/drivers/net/phy/icplus.c
@@ -150,7 +150,8 @@ static int ip101a_config_init(struct phy_device *phydev)
 	/* Enable Auto Power Saving mode */
 	c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 	c |= IP101A_APS_ON;
-	return c;
+
+	return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
 }
 
 static int ip175c_read_status(struct phy_device *phydev)
-- 
1.7.10.1