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

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Message-ID: <20150714205128.GI24416@google.com>
Date:	Tue, 14 Jul 2015 15:51:28 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Ray Jui <rjui@...adcom.com>
Cc:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	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

On Tue, Jul 14, 2015 at 01:23:23PM -0700, Ray Jui wrote:
> 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 for checking it out!  Can I add your Reviewed-by to the patch below?

> > 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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