netdev - Re: [PATCH 8/8] net/iucv: Use the new device_to_pm() helper to access struct dev_pm

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Date:   Tue, 26 May 2020 17:07:44 +0200
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Johan Hovold <johan@...nel.org>,
        Alex Elder <elder@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Felipe Balbi <balbi@...nel.org>,
        Julian Wiedmann <jwi@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        greybus-dev@...ts.linaro.org, netdev@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 8/8] net/iucv: Use the new device_to_pm() helper to
 access struct dev_pm_ops

Hello Greg,

[...]
> It's "interesting" how using your new helper doesn't actually make the
> code smaller.  Perhaps it isn't a good helper function?

The idea for the helper was inspired by the comment Dan made to Bjorn
about Bjorn's change, as per:

  https://lore.kernel.org/driverdev-devel/20191016135002.GA24678@kadam/

It looked like a good idea to try to reduce the following:

  dev->driver && dev->driver->pm && dev->driver->pm->prepare

Into something more succinct.  Albeit, given the feedback from yourself
and Rafael, I gather that this helper is not really a good addition.

Thank you everyone and sorry for the commotion!

Krzysztof