ASoC: fsl_spdif: use flat regmap cache
authorMarek Vasut <marex@denx.de>
Mon, 19 Sep 2016 19:30:27 +0000 (21:30 +0200)
committerMark Brown <broonie@kernel.org>
Tue, 20 Sep 2016 17:55:28 +0000 (18:55 +0100)
commit35ddb15757cd1c817e424c6252d2f11f268cfebf
tree38f6af1853a64c9feb403814ff0f37bf521532f8
parent0effb8651ee3b00513fbba9ef3912bbcbbd38af6
ASoC: fsl_spdif: use flat regmap cache

Same as commit ce492b3b8f99cf9d2f807ec22d8805c996a09503
Subject: drm/fsl-dcu: use flat regmap cache

Using flat regmap cache instead of RB-tree to avoid the following
lockdep warning on driver load:
WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:2871 lockdep_trace_alloc+0x104/0x128
DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))

The RB-tree regmap cache needs to allocate new space on first
writes. However, allocations in an atomic context (e.g. when a
spinlock is held) are not allowed. The function regmap_write
calls map->lock, which acquires a spinlock in the fast_io case.
Since the driver uses MMIO, the regmap bus of type regmap_mmio
is being used which has fast_io set to true.

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
sound/soc/fsl/fsl_spdif.c