[PATCH] serial: cpm_uart: call cpm_muram_init before registering console

[Greg Kroah-Hartman]

On Thu, Feb 13, 2020 at 12:43:42PM +0100, Rasmus Villemoes wrote:
> Christophe reports that powerpc 8xx silently fails to 5.6-rc1. It turns
> out I was wrong about nobody relying on the lazy initialization of the
> cpm/qe muram in commit b6231ea2b3c6 (soc: fsl: qe: drop broken lazy
> call of cpm_muram_init()).
> 
> Rather than reinstating the somewhat dubious lazy call (initializing a
> currently held spinlock, and implicitly doing a GFP_KERNEL under that
> spinlock), make sure that cpm_muram_init() is called early enough - I
> thought the calls from the subsys_initcalls were good enough, but when
> used by console drivers, that's obviously not the
> case. cpm_muram_init() is safe to call twice (there's an early return
> if it is already initialized), so keep the call from cpm_init() - in
> case SERIAL_CPM_CONSOLE=n.
> 
> Reported-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Fixes: b6231ea2b3c6 (soc: fsl: qe: drop broken lazy call of cpm_muram_init())
> Signed-off-by: Rasmus Villemoes <linux at rasmusvillemoes.dk>
> ---
> 
> Christophe, can I get you to add a formal Tested-by?
> 
> I'm not sure which tree this should go through.

I can take it, thanks.

greg k-h