Re: [PATCH v9] usb: dwc3: debugfs: Prevent any register access when devices is runtime suspended

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On Mon, May 08, 2023 at 09:18:17PM +0530, Udipto Goswami wrote:

> > I believe this should be backported as it fixes a crash/hang.
> > 
> > The stable rules are flexible, but it may also be possible to break the
> > patch up in pieces and add a corresponding Fixes tag.
> 
> Agree, I will add a fixes tag for the oldest change that introduced the 
> debugfs attributes instead of breaking it to multiple patches and adding 
> fixes for each one. (I think the present code changes can stay in one 
> patch as we are fixing the same issue in all the functions).
> 
> Let me know if you think otherwise?

Sounds good to me. Note that the fix depends on 

	30332eeefec8 ("debugfs: regset32: Add Runtime PM support")

which went into 5.7.

This can be documented as

	Cc: stable@xxxxxxxxxxxxxxx	# 3.2: 30332eeefec8: debugfs: regset32: Add Runtime PM support

(see Documentation/process/stable-kernel-rules.rst).

Note that this issue appears to have been there since the driver was
first merged in 3.2.

Johan



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