From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>,
Lee Jones <lee.jones@linaro.org>,
Leon Romanovsky <leon@kernel.org>,
"David E. Box" <david.e.box@linux.intel.com>,
hdegoede@redhat.com, bhelgaas@google.com,
srinivas.pandruvada@intel.com, shuah@kernel.org,
mgross@linux.intel.com, linux-kernel@vger.kernel.org,
platform-driver-x86@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-pci@vger.kernel.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [V2 2/6] driver core: auxiliary bus: Add driver data helpers
Date: Thu, 9 Dec 2021 18:54:15 +0200 [thread overview]
Message-ID: <YbI0t2D5ute46Ty2@smile.fi.intel.com> (raw)
In-Reply-To: <20211209163245.GA245119@bhelgaas>
On Thu, Dec 09, 2021 at 10:32:45AM -0600, Bjorn Helgaas wrote:
> [+cc Rafael, since I used generic PM as an example]
> On Wed, Dec 08, 2021 at 09:47:56AM +0100, Greg KH wrote:
...
Okay, more bikeshedding :-)
> In the very common situation of PCI drivers that use generic power
> management, authors *do* have to use both (example from [1]):
>
> ioh_gpio_probe(struct pci_dev *pdev) # pci_driver.probe()
> pci_set_drvdata(pdev, chip);
>
> ioh_gpio_remove(struct pci_dev *pdev) # pci_driver.remove()
> struct ioh_gpio *chip = pci_get_drvdata(pdev);
>
> ioh_gpio_suspend(struct device *dev) # pci_driver.driver.pm.suspend()
> struct ioh_gpio *chip = dev_get_drvdata(dev); <--
>
> The pci_driver methods receive a struct pci_dev and use the
> pci_get_drvdata() wrapper.
>
> The generic power management methods receive a struct device and use
> the underlying dev_get_drvdata().
>
> It's kind of ugly that readers have to know that pci_get_drvdata()
> gives you the same thing as dev_get_drvdata().
>
> I guess the generic PM methods could do something like:
>
> pci_get_drvdata(to_pci_dev(dev));
>
> but that seems a little bit circuitous. It's slightly wordier, but I
> might prefer to just use this everywhere and skip the pci_* wrappers:
>
> dev_get_drvdata(&pdev->dev);
Strictly speaking the
<$BUS)_get_drvdata(<$CONTAINER>) != dev_get_drvdata(dev)
it's completely up to the container handling code what to do.
In 99% (or 100%?) cases it's equal, but it's not obliged to be so.
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpio/gpio-ml-ioh.c?id=v5.15#n505
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-12-09 16:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 17:14 [V2 0/6] Auxiliary bus driver support for Intel PCIe VSEC/DVSEC David E. Box
2021-12-07 17:14 ` [V2 1/6] PCI: Add #defines for accessing PCIe DVSEC fields David E. Box
2021-12-07 17:14 ` [V2 2/6] driver core: auxiliary bus: Add driver data helpers David E. Box
2021-12-07 17:35 ` Andy Shevchenko
2021-12-08 7:03 ` Leon Romanovsky
2021-12-08 7:07 ` Greg KH
2021-12-08 8:32 ` Leon Romanovsky
2021-12-08 8:43 ` Greg KH
2021-12-08 9:12 ` Leon Romanovsky
2021-12-08 10:14 ` Andy Shevchenko
2021-12-08 10:48 ` Leon Romanovsky
2021-12-08 8:43 ` Lee Jones
2021-12-08 8:47 ` Greg KH
2021-12-08 9:13 ` Lee Jones
2021-12-08 10:15 ` Andy Shevchenko
2021-12-09 16:32 ` Bjorn Helgaas
2021-12-09 16:54 ` Andy Shevchenko [this message]
2021-12-08 9:18 ` Leon Romanovsky
2021-12-07 17:14 ` [V2 3/6] platform/x86/intel: Move intel_pmt from MFD to Auxiliary Bus David E. Box
2021-12-07 17:14 ` [V2 4/6] platform/x86: Add Intel Software Defined Silicon driver David E. Box
2021-12-08 7:14 ` Leon Romanovsky
2021-12-08 10:42 ` David E. Box
2021-12-08 10:56 ` Leon Romanovsky
2021-12-07 17:14 ` [V2 5/6] sample/sdsi: Sample of SDSi provisiong using sysfs David E. Box
2021-12-07 17:14 ` [V2 6/6] selftests: sdsi: test sysfs setup David E. Box
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