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Currently the use of pm_runtime_put_sync() is not safe from interrupts-disabled context because rpm_idle() will release the spinlock and enable interrupts for the idle callbacks. This enables interrupts during a time where interrupts were expected to be disabled, and can have strange side effects on drivers that expected interrupts to be disabled. This is not a bug since the documentation clearly states that only _put_sync_suspend() is safe in IRQ-safe mode. However, pm_runtime_put_sync() could be made safe when in IRQ-safe mode by releasing the spinlock but not re-enabling interrupts, which is what this patch aims to do. Problem was found when using some buggy drivers that set pm_runtime_irq_safe() and used _put_sync() in interrupts-disabled context. Reported-by: Colin Cross <ccross@google.com> Tested-by: Nishanth Menon <nm@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> |
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| .. | ||
| regulator | ||
| 00-INDEX | ||
| apm-acpi.txt | ||
| basic-pm-debugging.txt | ||
| devices.txt | ||
| drivers-testing.txt | ||
| freezing-of-tasks.txt | ||
| interface.txt | ||
| notifiers.txt | ||
| opp.txt | ||
| pci.txt | ||
| pm_qos_interface.txt | ||
| power_supply_class.txt | ||
| runtime_pm.txt | ||
| s2ram.txt | ||
| states.txt | ||
| swsusp-and-swap-files.txt | ||
| swsusp-dmcrypt.txt | ||
| swsusp.txt | ||
| tricks.txt | ||
| userland-swsusp.txt | ||
| video_extension.txt | ||
| video.txt | ||