On Thu, Sep 22, 2016 at 06:17:45PM +0800, Elaine Zhang wrote:

> Regmap lock is taken in regmap_update_bits_base() and then
> regcache_drop_region() tries to take it again.
> which added in commit 815806e39bf6
> ("regmap: drop cache if the bus transfer error")

Someone already sent a change for this.

> Backtrace:
> [<8068ab7c>] (__schedule) from [<8068b1c4>] (schedule+0xb8/0xd0)
> [<8068b10c>] (schedule) from [<8068b61c>] 
> (schedule_preempt_disabled+0x20/0x2c)

Please think hard before including complete backtraces in upstream
reports, they are very large and contain almost no useful information
relative to their size so often obscure the relevant content in your
message. If part of the backtrace is usefully illustrative then it's
usually better to pull out the relevant sections.

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