diff options
| author | Mark Brown <broonie@linaro.org> | 2014-03-18 10:53:26 (GMT) |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-03-18 12:21:35 (GMT) |
| commit | 56fb1c74f3bda1c0100fc3e9a7888c229174f9a4 (patch) | |
| tree | 4cf163d91b52f07fec2fcde9c1d7f4867b794e2a /drivers/base/regmap/regmap.c | |
| parent | 38dbfb59d1175ef458d006556061adeaa8751b72 (diff) | |
| download | linux-56fb1c74f3bda1c0100fc3e9a7888c229174f9a4.tar.xz | |
regmap: Ensure regmap_register_patch() is compatible with fast_io
With fast_io we use mutexes to lock the I/O operations so we would need
to do GFP_ATOMIC allocations if we wanted to do allocations inside the
lock as we do currently. Since it is unlikely that we will want to register
a patch outside of init where concurrency shouldn't be an issue move the
allocation of the patch data outside the lock.
Reported-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/base/regmap/regmap.c')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 6a19515..e5a5509 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -2173,6 +2173,9 @@ EXPORT_SYMBOL_GPL(regmap_async_complete); * apply them immediately. Typically this is used to apply * corrections to be applied to the device defaults on startup, such * as the updates some vendors provide to undocumented registers. + * + * The caller must ensure that this function cannot be called + * concurrently with either itself or regcache_sync(). */ int regmap_register_patch(struct regmap *map, const struct reg_default *regs, int num_regs) @@ -2185,6 +2188,17 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs, num_regs)) return 0; + p = krealloc(map->patch, + sizeof(struct reg_default) * (map->patch_regs + num_regs), + GFP_KERNEL); + if (p) { + memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs)); + map->patch = p; + map->patch_regs += num_regs; + } else { + return -ENOMEM; + } + map->lock(map->lock_arg); bypass = map->cache_bypass; @@ -2202,17 +2216,6 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs, } } - p = krealloc(map->patch, - sizeof(struct reg_default) * (map->patch_regs + num_regs), - GFP_KERNEL); - if (p) { - memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs)); - map->patch = p; - map->patch_regs += num_regs; - } else { - ret = -ENOMEM; - } - out: map->async = false; map->cache_bypass = bypass; |