spi_complete oops

["237 Rumjantsev Egor (PROG)" <rumjantsev@xxxxxxxxxxx>]

Hello.
I develop driver to communicate to some chip via spi. Chip generate 
interrupts in which i run workqueue. Inside workqueue's handler i need 
to exchange data white chip again. Sometimes i got OOPS in spi_complete 
as args == NULL. What can be the reason of this? SPI message .complete 
and .context set up in __spy_sync call.
I run kernel 3.1.5 on Variscite OM4460 board.

WBR,
--
Rumjantsev Egor
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