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

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Date:   Tue, 30 Jun 2020 12:21:14 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     elder@...aro.org
Cc:     kuba@...nel.org, evgreen@...omium.org, subashab@...eaurora.org,
        cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/5] net: ipa: head-of-line block registers
 are RX only

From: Alex Elder <elder@...aro.org>
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.