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authorKevin Hilman <khilman@ti.com>2011-08-05 21:45:20 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-08-05 21:45:20 +0200
commit02b26774afebb2d62695ba3230319d70d8c6cc2d (patch)
tree956c4056fcb42d2c2b2a75e20d3ad98f148865fc /crypto/serpent.c
parentPM / Domains: Fix pm_genpd_poweron() (diff)
downloadlinux-02b26774afebb2d62695ba3230319d70d8c6cc2d.tar.xz
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PM / Runtime: Allow _put_sync() from interrupts-disabled context
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>
Diffstat (limited to 'crypto/serpent.c')
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