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ARM: omap2+: omap_hwmod: Set unique lock_class_key per hwmod 

Add struct lock_class_key to omap_hwmod struct and use it to set unique
lockdep class per hwmod.
This will ensure that lockdep will know that each omap_hwmod->_lock should
be treated as separate class and will not give false warning about deadlock
or other issues due to nested use of hwmods.
DRA7x's ATL hwmod is one example for this since McASP can select ATL clock
as functional clock, which will trigger nested oh->_lock usage. This will
trigger false warning from lockdep validator as it is dealing with classes
and for it all hwmod clocks are the same class.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Peter Ujfalusi 2015-02-26 00:00:51 -07:00 committed by Paul Walmsley
parent c517d838eb
commit 6931795238
2 changed files with 2 additions and 0 deletions
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1
arch/arm/mach-omap2/omap_hwmod.c
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@ -2698,6 +2698,7 @@ static int __init _register(struct omap_hwmod *oh)
INIT_LIST_HEAD(&oh->master_ports);
INIT_LIST_HEAD(&oh->slave_ports);
spin_lock_init(&oh->_lock);
lockdep_set_class(&oh->_lock, &oh->hwmod_key);
oh->_state = _HWMOD_STATE_REGISTERED;

1
arch/arm/mach-omap2/omap_hwmod.h
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@ -674,6 +674,7 @@ struct omap_hwmod {
u32 _sysc_cache;
void __iomem *_mpu_rt_va;
spinlock_t _lock;
struct lock_class_key hwmod_key; /* unique lock class */
struct list_head node;
struct omap_hwmod_ocp_if *_mpu_port;
unsigned int (*xlate_irq)(unsigned int);