Re: [PATCH net-next 1/5] net: ipa: head-of-line block registers are RX only

[David Miller]

From: Alex Elder <elder@xxxxxxxxxx>
Date: Mon, 29 Jun 2020 20:09:58 -0500

> But the reason I was
> considering it conditional on a config option is that Qualcomm
> has a crash analysis tool that expects a BUG() call to stop the
> system so its instant state can be captured.  I don't use this
> tool, and I might be mistaken about what's required.

A Qualcomm debugging tool with poorly choosen expectations does not
determine how we do things in the kernel.

> What I would *really* like to do is have a way to gracefully
> shut down just the IPA driver when an unexpected condition occurs,
> so I can stop everything without crashing the system.  But doing
> that in a way that works in all cases is Hard.

Users would like their system and the IPA device to continue, even
if in a reduced functionality manner, if possible.

Doing things to make that less likely to be possible is undesirable.