• Marek Vasut's avatar
    ASoC: fsl_asrc: use flat regmap cache · b4138868
    Marek Vasut authored
    Same as commit ce492b3b
    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: default avatarMarek Vasut <marex@denx.de>
    Acked-by: default avatarNicolin Chen <nicoleotsuka@gmail.com>
    Signed-off-by: default avatarMark Brown <broonie@kernel.org>
    b4138868
fsl_asrc.c 29.2 KB