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Since commita8636c8964("PM / Runtime: Don't allow to suspend a device with an active child"), which went into 4.10, it is no longer permitted to set RPM_SUSPENDED state for a device with active children (unless power.ignore_children is set). This specifically means that the attempts to do just that from the omap pm-domain suspend_noirq callback have since been failing whenever a child is active, for example: am335x-usb-childs 47400000.usb: runtime PM trying to suspend device but active child Silence this warning by dropping the broken pm_runtime_set_suspended() call from the omap suspend_noirq callback along with the redundant pm_runtime_set_active() in resume_noirq. This effectively reverts commit3522bf7bfa("ARM: OMAP2+: omap_device: maintain sane runtime pm status around suspend/resume"), which started updating the RPM state after the runtime_suspend callback (!) for active omap devices had been called during system suspend. The rationale was that a later pm_runtime_get_sync() would then fail (even after runtime pm had been disabled) and that this in turn would avoid any external aborts when accessing registers with clocks disabled. (See also commit6f3c77b040("PM / Runtime: let rpm_resume() succeed if RPM_ACTIVE, even when disabled, v2"). But during the suspend_noirq phase all children would already have been suspended and their drivers would specifically not attempt any further register accesses. And if this was all just a workaround for random device drivers doing cross-tree calls during system suspend, those drivers should be fixed and updated to explicitly model such dependencies using device-links instead (and either way, any such calls have been causing crashes since 4.10). Fixes:3522bf7bfa("ARM: OMAP2+: omap_device: maintain sane runtime pm status around suspend/resume") Fixes:a8636c8964("PM / Runtime: Don't allow to suspend a device with an active child") Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Dave Gerlach <d-gerlach@ti.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Nishanth Menon <nm@ti.com> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Tony Lindgren <tony@atomide.com> Cc: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Johan Hovold <johan@kernel.org> Tested-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.