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Commitc5eb119007("PCI / PM: Allow runtime PM without callback functions") eliminated the need for PM callbacks in pci_pm_runtime_suspend() and pci_pm_runtime_resume(), but didn't do the same for pci_pm_runtime_idle(). Therefore, runtime suspend worked as long as the driver implemented at least one PM callback. But if the driver doesn't implement any PM callbacks at all (driver->pm is NULL), pci_pm_runtime_idle() returned -ENOSYS, which prevented runtime suspend. Modify pci_pm_runtime_idle() to allow PCI device power state transitions without runtime PM callbacks and complete the original intention of commitc5eb119007("PCI / PM: Allow runtime PM without callback functions"). Link: https://lore.kernel.org/r/20240227062648.16579-1-raag.jadav@intel.com Signed-off-by: Raag Jadav <raag.jadav@intel.com> [bhelgaas: commit log] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.