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| author | Lars-Peter Clausen <lars@metafoo.de> | 2013-05-24 10:29:22 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-05-25 11:16:02 -0400 |
| commit | 92ab1aab59c61b3e05200b9aa0e05ab770059142 (patch) | |
| tree | 53c798ac04a0ffabcdca31f33e69420fe864f1e7 /drivers/base/regmap/internal.h | |
| parent | 81485f5220770c381ac076573642ac44f13723af (diff) | |
| download | blackbird-op-linux-92ab1aab59c61b3e05200b9aa0e05ab770059142.tar.gz blackbird-op-linux-92ab1aab59c61b3e05200b9aa0e05ab770059142.zip | |
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>
Diffstat (limited to 'drivers/base/regmap/internal.h')
| -rw-r--r-- | drivers/base/regmap/internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index b33a4ff67adf..ae23d8391aa0 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -52,6 +52,7 @@ struct regmap_async { struct regmap { struct mutex mutex; spinlock_t spinlock; + unsigned long spinlock_flags; regmap_lock lock; regmap_unlock unlock; void *lock_arg; /* This is passed to lock/unlock functions */ |
