Hi Roshni,

2011/8/18 Rosh shah [off-list ref]:

Hi,

I have ported Davinci DM6467T support to the 2.6.33.9-rt for a
project. I am running into the following issue every time I run the
encode application gets a DMA interrupt. I have referred to the
various other instances of the same issue on older RT kernels, but
haven't gathered a solution for the same. Kindly help me understand
the issue / throw some light on how I can approach the solution.
Any thoughts are greatly appreciated.

Aug 16 14:44:01 dm6467t-evm user.debug kernel: dma complete  <INSERTED
BY B.J this is when the DMA ISR is called>
Aug 16 14:44:01 dm6467t-evm user.err kernel: BUG: sleeping function
called from invalid context at kernel/rtmutex.c:644

Looking at the backtrace, first guess: the dmaIsr() function tries to
call complete() with preemption and/or interrupts disabled.
In that case it runs into a regular spinlock that is converted to a
rt_mutex which, due to its nature, might sleep, which on its turn is
illegal in that context.

Kind regards,

Remy
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