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regmap: Make regmap-mmio usable from atomic contexts
regmap-mmio uses a spinlock with spin_lock() and spin_unlock() for locking. To be able to use the regmap API from different contexts (atomic vs non-atomic), without the risk of race conditions, we need to use spin_lock_irqsave() and spin_lock_irqrestore() instead. A new field, the spinlock_flags field, is added to regmap struct to store the flags between regmap_{,un}lock_spinlock(). The spinlock_flags field itself is also protected by the spinlock. Thanks to Stephen Warren for the suggestion of this particular solution. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -52,6 +52,7 @@ struct regmap_async {
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struct regmap {
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struct mutex mutex;
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spinlock_t spinlock;
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unsigned long spinlock_flags;
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regmap_lock lock;
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regmap_unlock unlock;
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void *lock_arg; /* This is passed to lock/unlock functions */
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@ -302,13 +302,16 @@ static void regmap_unlock_mutex(void *__map)
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static void regmap_lock_spinlock(void *__map)
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{
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struct regmap *map = __map;
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spin_lock(&map->spinlock);
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unsigned long flags;
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spin_lock_irqsave(&map->spinlock, flags);
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map->spinlock_flags = flags;
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}
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static void regmap_unlock_spinlock(void *__map)
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{
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struct regmap *map = __map;
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spin_unlock(&map->spinlock);
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spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
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}
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static void dev_get_regmap_release(struct device *dev, void *res)
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