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

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Message-ID: <825816f3-5797-bbcf-571b-c6a7a6821397@linaro.org>
Date:   Mon, 29 Jun 2020 20:09:58 -0500
From:   Alex Elder <elder@...aro.org>
To:     David Miller <davem@...emloft.net>
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

On 6/29/20 8:03 PM, David Miller wrote:
> Never BUG_ON() unless you absolutely cannot continue executing kernel
> without corrupting memory or similar.

Yes, that's basically why I don't use it.  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.

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.

Do you have any suggestions?

					-Alex