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Date:   Thu, 1 Apr 2021 10:56:16 -0600
From:   Alex Williamson <alex.williamson@redhat.com>
To:     Leon Romanovsky <leon@kernel.org>
Cc:     Raphael Norwitz <raphael.norwitz@nutanix.com>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "ameynarkhede03@gmail.com" <ameynarkhede03@gmail.com>
Subject: Re: [PATCH] PCI: merge slot and bus reset implementations
Message-ID: <20210401105616.71156d08@omen>
In-Reply-To: <YGW8Oe9jn+n9sVsw@unreal>
References: <20210401053656.16065-1-raphael.norwitz@nutanix.com>
        <YGW8Oe9jn+n9sVsw@unreal>
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On Thu, 1 Apr 2021 15:27:37 +0300
Leon Romanovsky <leon@kernel.org> wrote:

> On Thu, Apr 01, 2021 at 05:37:16AM +0000, Raphael Norwitz wrote:
> > Slot resets are bus resets with additional logic to prevent a device
> > from being removed during the reset. Currently slot and bus resets have
> > separate implementations in pci.c, complicating higher level logic. As
> > discussed on the mailing list, they should be combined into a generic
> > function which performs an SBR. This change adds a function,
> > pci_reset_bus_function(), which first attempts a slot reset and then
> > attempts a bus reset if -ENOTTY is returned, such that there is now a
> > single device agnostic function to perform an SBR.
> > 
> > This new function is also needed to add SBR reset quirks and therefore
> > is exposed in pci.h.
> > 
> > Link: https://lkml.org/lkml/2021/3/23/911
> > 
> > Suggested-by: Alex Williamson <alex.williamson@redhat.com>
> > Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
> > Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
> > ---
> >  drivers/pci/pci.c   | 17 +++++++++--------
> >  include/linux/pci.h |  1 +
> >  2 files changed, 10 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index 16a17215f633..12a91af2ade4 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -4982,6 +4982,13 @@ static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
> >  	return pci_reset_hotplug_slot(dev->slot->hotplug, probe);
> >  }
> >  
> > +int pci_reset_bus_function(struct pci_dev *dev, int probe)
> > +{
> > +	int rc = pci_dev_reset_slot_function(dev, probe);
> > +
> > +	return (rc == -ENOTTY) ? pci_parent_bus_reset(dev, probe) : rc;  
> 
> The previous coding style is preferable one in the Linux kernel.
> int rc = pci_dev_reset_slot_function(dev, probe);
> if (rc != -ENOTTY)
>   return rc;
> return pci_parent_bus_reset(dev, probe);


That'd be news to me, do you have a reference?  I've never seen
complaints for ternaries previously.  Thanks,

Alex