resend [BUG] atmel: spi: scheduling while atomic

Hi,
again I discovered a problem when I access devices on SPI. It appears if I access one device pretty often (about once at second) and the error message appears about 3 times a hour. Nevertheless it works correctly. I thing it's in kernels 3.17 and 3.18 maybe even longer, now I have 3.18.21.

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[10176.960000] BUG: scheduling while atomic: spi0/401/0x00000002
[10176.960000] Modules linked in:
[10176.960000] Preemption disabled at:[<  (null)>]   (null)
[10176.960000]
[10176.960000] CPU: 0 PID: 401 Comm: spi0 Tainted: G        W      3.18.21_cpm9g25 #2
[10176.960000] [<c000eef4>] (unwind_backtrace) from [<c000c558>] (show_stack+0x20/0x24)
[10176.960000] [<c000c558>] (show_stack) from [<c04a214c>] (dump_stack+0x20/0x28)
[10176.960000] [<c04a214c>] (dump_stack) from [<c049fc74>] (__schedule_bug+0x88/0xac)
[10176.960000] [<c049fc74>] (__schedule_bug) from [<c04a3488>] (__schedule+0x68/0x508)
[10176.960000] [<c04a3488>] (__schedule) from [<c04a3ae0>] (schedule+0xa0/0xa4)
[10176.960000] [<c04a3ae0>] (schedule) from [<c04a3cac>] (schedule_preempt_disabled+0x20/0x2c)
[10176.960000] [<c04a3cac>] (schedule_preempt_disabled) from [<c04a5684>] (__mutex_lock_slowpath+0xe8/0x17c)
[10176.960000] [<c04a5684>] (__mutex_lock_slowpath) from [<c04a5758>] (mutex_lock+0x40/0x44)
[10176.960000] [<c04a5758>] (mutex_lock) from [<c039086c>] (clk_prepare_lock+0x58/0xf4)
[10176.960000] [<c039086c>] (clk_prepare_lock) from [<c0391808>] (clk_get_rate+0x1c/0x54)
[10176.960000] [<c0391808>] (clk_get_rate) from [<c0311c60>] (atmel_spi_transfer_one_message+0x264/0x9ec)
[10176.960000] [<c0311c60>] (atmel_spi_transfer_one_message) from [<c030f428>] (spi_pump_messages+0x5cc/0x5f0)
[10176.960000] [<c030f428>] (spi_pump_messages) from [<c003541c>] (kthread_worker_fn+0x140/0x1ac)
[10176.960000] [<c003541c>] (kthread_worker_fn) from [<c00355c4>] (kthread+0xd4/0xe8)
[10176.960000] [<c00355c4>] (kthread) from [<c0009798>] (ret_from_fork+0x14/0x20)

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