[drivers][imx-sdma] Ooops on null pointer access of bd0 register in sdma_load_context function

[shauer]

Hi Simon,

On Fri, Feb 10, 2023 at 02:15:40PM +0100, Simon Egli wrote:
> 
> Hello,
> 
> you seem to be responsible for maintaining drivers/dma/imx-sdma.c (as
> found out by get_maintainer.pl - following guide at
> https://www.kernel.org/doc/Documentation/admin-guide/bug-hunting.rst),
> I write you with a Oops kernel error in the imx-sdma.c file.
> 
> Following are two kernel Oops traces and one "decoded" stacktraces.
> I suspect that there is an illegal access in the sdma_load_context
> function with the "bd0->mode.command" register/variable.
> 
> I am sending you the traces in the hope, that you might have a look at
> it and fix the error, if it is still in the mainline kernel.
> This is from a machine running a non-tainted 5.15.32 kernel.

That's not how things work. If you want us to look at this problem you
have to show that the problem exists on a recent mainline kernel.

Also you should provide some information how this problem can be
reproduced. Without this information the maximum answer you can expect
is "works here".

Sascha

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