* [PATCH net-next] net: bcmgenet: Remove checks on clock handles
@ 2015-07-22 22:11 Florian Fainelli
2015-07-22 23:52 ` Petri Gynther
2015-07-26 23:45 ` David Miller
0 siblings, 2 replies; 4+ messages in thread
From: Florian Fainelli @ 2015-07-22 22:11 UTC (permalink / raw)
To: netdev; +Cc: davem, pgynther, jaedon.shin, Florian Fainelli
Instead of multiplying the number of checks for IS_ERR(priv->clk),
simply NULLify the 'struct clk' pointer which is something the Linux
common clock framework perfectly deals with and does early return for
each and every single clk_* API functions.
Having every single function check for !IS_ERR(priv->clk) is both
redundant and error prone, as it turns out, we were doing it for the
main GENET clock: priv->clk, but not for the Wake-on-LAN or EEE clock,
so let's just be consistent here.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/ethernet/broadcom/genet/bcmgenet.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 5bf7ce0ae221..133bb10fdd34 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2625,8 +2625,7 @@ static int bcmgenet_open(struct net_device *dev)
netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
/* Turn on the clock */
- if (!IS_ERR(priv->clk))
- clk_prepare_enable(priv->clk);
+ clk_prepare_enable(priv->clk);
/* If this is an internal GPHY, power it back on now, before UniMAC is
* brought out of reset as absolutely no UniMAC activity is allowed
@@ -2703,8 +2702,7 @@ err_irq0:
err_fini_dma:
bcmgenet_fini_dma(priv);
err_clk_disable:
- if (!IS_ERR(priv->clk))
- clk_disable_unprepare(priv->clk);
+ clk_disable_unprepare(priv->clk);
return ret;
}
@@ -2761,8 +2759,7 @@ static int bcmgenet_close(struct net_device *dev)
if (priv->internal_phy)
ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
- if (!IS_ERR(priv->clk))
- clk_disable_unprepare(priv->clk);
+ clk_disable_unprepare(priv->clk);
return ret;
}
@@ -3215,11 +3212,12 @@ static int bcmgenet_probe(struct platform_device *pdev)
priv->version = pd->genet_version;
priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
- if (IS_ERR(priv->clk))
+ if (IS_ERR(priv->clk)) {
dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
+ priv->clk = NULL;
+ }
- if (!IS_ERR(priv->clk))
- clk_prepare_enable(priv->clk);
+ clk_prepare_enable(priv->clk);
bcmgenet_set_hw_params(priv);
@@ -3230,8 +3228,10 @@ static int bcmgenet_probe(struct platform_device *pdev)
INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
- if (IS_ERR(priv->clk_wol))
+ if (IS_ERR(priv->clk_wol)) {
dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
+ priv->clk_wol = NULL;
+ }
priv->clk_eee = devm_clk_get(&priv->pdev->dev, "enet-eee");
if (IS_ERR(priv->clk_eee)) {
--
2.1.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] net: bcmgenet: Remove checks on clock handles
2015-07-22 22:11 [PATCH net-next] net: bcmgenet: Remove checks on clock handles Florian Fainelli
@ 2015-07-22 23:52 ` Petri Gynther
2015-07-22 23:56 ` Florian Fainelli
2015-07-26 23:45 ` David Miller
1 sibling, 1 reply; 4+ messages in thread
From: Petri Gynther @ 2015-07-22 23:52 UTC (permalink / raw)
To: Florian Fainelli; +Cc: netdev, David Miller, Jaedon Shin
On Wed, Jul 22, 2015 at 3:11 PM, Florian Fainelli <f.fainelli@gmail.com> wrote:
>
> Instead of multiplying the number of checks for IS_ERR(priv->clk),
> simply NULLify the 'struct clk' pointer which is something the Linux
> common clock framework perfectly deals with and does early return for
> each and every single clk_* API functions.
>
> Having every single function check for !IS_ERR(priv->clk) is both
> redundant and error prone, as it turns out, we were doing it for the
> main GENET clock: priv->clk, but not for the Wake-on-LAN or EEE clock,
> so let's just be consistent here.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> drivers/net/ethernet/broadcom/genet/bcmgenet.c | 20 ++++++++++----------
> 1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index 5bf7ce0ae221..133bb10fdd34 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -2625,8 +2625,7 @@ static int bcmgenet_open(struct net_device *dev)
> netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
>
> /* Turn on the clock */
> - if (!IS_ERR(priv->clk))
> - clk_prepare_enable(priv->clk);
> + clk_prepare_enable(priv->clk);
>
> /* If this is an internal GPHY, power it back on now, before UniMAC is
> * brought out of reset as absolutely no UniMAC activity is allowed
> @@ -2703,8 +2702,7 @@ err_irq0:
> err_fini_dma:
> bcmgenet_fini_dma(priv);
> err_clk_disable:
> - if (!IS_ERR(priv->clk))
> - clk_disable_unprepare(priv->clk);
> + clk_disable_unprepare(priv->clk);
> return ret;
> }
>
> @@ -2761,8 +2759,7 @@ static int bcmgenet_close(struct net_device *dev)
> if (priv->internal_phy)
> ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
>
> - if (!IS_ERR(priv->clk))
> - clk_disable_unprepare(priv->clk);
> + clk_disable_unprepare(priv->clk);
>
> return ret;
> }
> @@ -3215,11 +3212,12 @@ static int bcmgenet_probe(struct platform_device *pdev)
> priv->version = pd->genet_version;
>
> priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
> - if (IS_ERR(priv->clk))
> + if (IS_ERR(priv->clk)) {
> dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
> + priv->clk = NULL;
> + }
Wouldn't the above be a fatal error? If you can't get the enet main
clock, any point to go further in this code?
>
> - if (!IS_ERR(priv->clk))
> - clk_prepare_enable(priv->clk);
> + clk_prepare_enable(priv->clk);
>
> bcmgenet_set_hw_params(priv);
>
> @@ -3230,8 +3228,10 @@ static int bcmgenet_probe(struct platform_device *pdev)
> INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
>
> priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
> - if (IS_ERR(priv->clk_wol))
> + if (IS_ERR(priv->clk_wol)) {
> dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
> + priv->clk_wol = NULL;
> + }
>
> priv->clk_eee = devm_clk_get(&priv->pdev->dev, "enet-eee");
> if (IS_ERR(priv->clk_eee)) {
> --
> 2.1.0
>
Looking at the rest of the code in bcmgenet_probe(), I still see:
/* Turn off the main clock, WOL clock is handled separately */
if (!IS_ERR(priv->clk))
clk_disable_unprepare(priv->clk);
err_clk_disable:
if (!IS_ERR(priv->clk))
clk_disable_unprepare(priv->clk);
you probably want to convert those as well, right?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] net: bcmgenet: Remove checks on clock handles
2015-07-22 23:52 ` Petri Gynther
@ 2015-07-22 23:56 ` Florian Fainelli
0 siblings, 0 replies; 4+ messages in thread
From: Florian Fainelli @ 2015-07-22 23:56 UTC (permalink / raw)
To: Petri Gynther; +Cc: netdev, David Miller, Jaedon Shin
On 22/07/15 16:52, Petri Gynther wrote:
> On Wed, Jul 22, 2015 at 3:11 PM, Florian Fainelli <f.fainelli@gmail.com> wrote:
>>
>> Instead of multiplying the number of checks for IS_ERR(priv->clk),
>> simply NULLify the 'struct clk' pointer which is something the Linux
>> common clock framework perfectly deals with and does early return for
>> each and every single clk_* API functions.
>>
>> Having every single function check for !IS_ERR(priv->clk) is both
>> redundant and error prone, as it turns out, we were doing it for the
>> main GENET clock: priv->clk, but not for the Wake-on-LAN or EEE clock,
>> so let's just be consistent here.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> ---
>> drivers/net/ethernet/broadcom/genet/bcmgenet.c | 20 ++++++++++----------
>> 1 file changed, 10 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> index 5bf7ce0ae221..133bb10fdd34 100644
>> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> @@ -2625,8 +2625,7 @@ static int bcmgenet_open(struct net_device *dev)
>> netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
>>
>> /* Turn on the clock */
>> - if (!IS_ERR(priv->clk))
>> - clk_prepare_enable(priv->clk);
>> + clk_prepare_enable(priv->clk);
>>
>> /* If this is an internal GPHY, power it back on now, before UniMAC is
>> * brought out of reset as absolutely no UniMAC activity is allowed
>> @@ -2703,8 +2702,7 @@ err_irq0:
>> err_fini_dma:
>> bcmgenet_fini_dma(priv);
>> err_clk_disable:
>> - if (!IS_ERR(priv->clk))
>> - clk_disable_unprepare(priv->clk);
>> + clk_disable_unprepare(priv->clk);
>> return ret;
>> }
>>
>> @@ -2761,8 +2759,7 @@ static int bcmgenet_close(struct net_device *dev)
>> if (priv->internal_phy)
>> ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
>>
>> - if (!IS_ERR(priv->clk))
>> - clk_disable_unprepare(priv->clk);
>> + clk_disable_unprepare(priv->clk);
>>
>> return ret;
>> }
>> @@ -3215,11 +3212,12 @@ static int bcmgenet_probe(struct platform_device *pdev)
>> priv->version = pd->genet_version;
>>
>> priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
>> - if (IS_ERR(priv->clk))
>> + if (IS_ERR(priv->clk)) {
>> dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
>> + priv->clk = NULL;
>> + }
>
> Wouldn't the above be a fatal error? If you can't get the enet main
> clock, any point to go further in this code?
No, you could have a system with no clock provider at all because:
- you purposely disabled your clock driver
- you removed clock phandles from e.g: Device Tree
but your HW might still be turned on by default and this would be by design.
>
>>
>> - if (!IS_ERR(priv->clk))
>> - clk_prepare_enable(priv->clk);
>> + clk_prepare_enable(priv->clk);
>>
>> bcmgenet_set_hw_params(priv);
>>
>> @@ -3230,8 +3228,10 @@ static int bcmgenet_probe(struct platform_device *pdev)
>> INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
>>
>> priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
>> - if (IS_ERR(priv->clk_wol))
>> + if (IS_ERR(priv->clk_wol)) {
>> dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
>> + priv->clk_wol = NULL;
>> + }
>>
>> priv->clk_eee = devm_clk_get(&priv->pdev->dev, "enet-eee");
>> if (IS_ERR(priv->clk_eee)) {
>> --
>> 2.1.0
>>
>
> Looking at the rest of the code in bcmgenet_probe(), I still see:
> /* Turn off the main clock, WOL clock is handled separately */
> if (!IS_ERR(priv->clk))
> clk_disable_unprepare(priv->clk);
>
> err_clk_disable:
> if (!IS_ERR(priv->clk))
> clk_disable_unprepare(priv->clk);
>
> you probably want to convert those as well, right?
Yes, thanks for catching these.
--
Florian
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] net: bcmgenet: Remove checks on clock handles
2015-07-22 22:11 [PATCH net-next] net: bcmgenet: Remove checks on clock handles Florian Fainelli
2015-07-22 23:52 ` Petri Gynther
@ 2015-07-26 23:45 ` David Miller
1 sibling, 0 replies; 4+ messages in thread
From: David Miller @ 2015-07-26 23:45 UTC (permalink / raw)
To: f.fainelli; +Cc: netdev, pgynther, jaedon.shin
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Wed, 22 Jul 2015 15:11:54 -0700
> Instead of multiplying the number of checks for IS_ERR(priv->clk),
> simply NULLify the 'struct clk' pointer which is something the Linux
> common clock framework perfectly deals with and does early return for
> each and every single clk_* API functions.
>
> Having every single function check for !IS_ERR(priv->clk) is both
> redundant and error prone, as it turns out, we were doing it for the
> main GENET clock: priv->clk, but not for the Wake-on-LAN or EEE clock,
> so let's just be consistent here.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
My understanding is that you will be posting a new version of this
patch updating the cases in bcmgenet_probe() that Patri pointed out.
Right?
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-07-22 22:11 [PATCH net-next] net: bcmgenet: Remove checks on clock handles Florian Fainelli
2015-07-22 23:52 ` Petri Gynther
2015-07-22 23:56 ` Florian Fainelli
2015-07-26 23:45 ` David Miller
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