linux-kernel - Re: [PATCH] PCI-iproc: Delete unnecessary checks before two function calls

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Message-ID: <55A56FBB.20203@broadcom.com>
Date:	Tue, 14 Jul 2015 13:23:23 -0700
From:	Ray Jui <rjui@...adcom.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	SF Markus Elfring <elfring@...rs.sourceforge.net>
CC:	Scott Branden <sbranden@...adcom.com>, <linux-pci@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	LKML <linux-kernel@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	"Julia Lawall" <julia.lawall@...6.fr>
Subject: Re: [PATCH] PCI-iproc: Delete unnecessary checks before two function
 calls

Hi Bjorn,

On 7/14/2015 1:10 PM, Bjorn Helgaas wrote:
> On Sun, Jun 28, 2015 at 04:52:16PM +0200, SF Markus Elfring wrote:
>> From: Markus Elfring <elfring@...rs.sourceforge.net>
>> Date: Sun, 28 Jun 2015 16:42:04 +0200
>>
>> The functions phy_exit() and phy_power_off() test whether their argument
>> is NULL and then return immediately.
>> Thus the test around the calls is not needed.
>>
>> This issue was detected by using the Coccinelle software.
>>
>> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> 
> I haven't seen a followup to Ray's review, but in the interest of making
> progress, I updated and applied the patch as appended.  I also reviewed
> other phy_*() calls under drivers/pci, and they all look OK (with no
> unnecessary tests for NULL).
> 
> This is on the pci/host-iproc branch for v4.3.
> 

Hmmm....I searched my mailbox but cannot find an email with this patch
(while I remember I reviewed and commented on the initial version of
this patch). It must have gone into some sub-folder or deleted by me by
accident. My bad.

Nevertheless,the current patch looks good to me!

Thanks,

Ray

>> ---
>>  drivers/pci/host/pcie-iproc.c | 7 ++-----
>>  1 file changed, 2 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
>> index d77481e..f875821 100644
>> --- a/drivers/pci/host/pcie-iproc.c
>> +++ b/drivers/pci/host/pcie-iproc.c
>> @@ -239,12 +239,9 @@ err_rm_root_bus:
>>  	pci_remove_root_bus(bus);
>>  
>>  err_power_off_phy:
>> -	if (pcie->phy)
>> -		phy_power_off(pcie->phy);
>> +	phy_power_off(pcie->phy);
>>  err_exit_phy:
>> -	if (pcie->phy)
>> -		phy_exit(pcie->phy);
>> -
>> +	phy_exit(pcie->phy);
>>  	return ret;
>>  }
>>  EXPORT_SYMBOL(iproc_pcie_setup);
>> -- 
>> 2.4.4
> 
> commit 55b5e16332eb9ffc1cbaf975585f4521417ab427
> Author: Markus Elfring <elfring@...rs.sourceforge.net>
> Date:   Sun Jun 28 16:42:04 2015 +0200
> 
>     PCI: iproc: Delete unnecessary checks before phy calls
>     
>     The functions phy_exit() and phy_power_off() test whether their argument is
>     NULL and then return immediately.  Thus the test around the calls is not
>     needed.
>     
>     This issue was detected by using the Coccinelle software.
>     
>     [bhelgaas: also phy_init() and phy_power_on(), as Ray Jui suggested]
>     [bhelgaas: also remove tests in iproc_pcie_remove()]
>     Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
>     Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index d77481e..9a00dca 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -191,19 +191,16 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>  	if (!pcie || !pcie->dev || !pcie->base)
>  		return -EINVAL;
>  
> -	if (pcie->phy) {
> -		ret = phy_init(pcie->phy);
> -		if (ret) {
> -			dev_err(pcie->dev, "unable to initialize PCIe PHY\n");
> -			return ret;
> -		}
> -
> -		ret = phy_power_on(pcie->phy);
> -		if (ret) {
> -			dev_err(pcie->dev, "unable to power on PCIe PHY\n");
> -			goto err_exit_phy;
> -		}
> +	ret = phy_init(pcie->phy);
> +	if (ret) {
> +		dev_err(pcie->dev, "unable to initialize PCIe PHY\n");
> +		return ret;
> +	}
>  
> +	ret = phy_power_on(pcie->phy);
> +	if (ret) {
> +		dev_err(pcie->dev, "unable to power on PCIe PHY\n");
> +		goto err_exit_phy;
>  	}
>  
>  	iproc_pcie_reset(pcie);
> @@ -239,12 +236,9 @@ err_rm_root_bus:
>  	pci_remove_root_bus(bus);
>  
>  err_power_off_phy:
> -	if (pcie->phy)
> -		phy_power_off(pcie->phy);
> +	phy_power_off(pcie->phy);
>  err_exit_phy:
> -	if (pcie->phy)
> -		phy_exit(pcie->phy);
> -
> +	phy_exit(pcie->phy);
>  	return ret;
>  }
>  EXPORT_SYMBOL(iproc_pcie_setup);
> @@ -254,10 +248,8 @@ int iproc_pcie_remove(struct iproc_pcie *pcie)
>  	pci_stop_root_bus(pcie->root_bus);
>  	pci_remove_root_bus(pcie->root_bus);
>  
> -	if (pcie->phy) {
> -		phy_power_off(pcie->phy);
> -		phy_exit(pcie->phy);
> -	}
> +	phy_power_off(pcie->phy);
> +	phy_exit(pcie->phy);
>  
>  	return 0;
>  }
> 
--
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