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Re: [Qemu-trivial] [Qemu-devel] [PULL 7/7] hw/misc/mmio_interface: Retur

From: Thomas Huth
Subject: Re: [Qemu-trivial] [Qemu-devel] [PULL 7/7] hw/misc/mmio_interface: Return after error_setg() to avoid crash
Date: Mon, 14 Aug 2017 13:52:53 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

On 14.08.2017 13:45, Peter Maydell wrote:
> On 14 August 2017 at 12:07, Michael Tokarev <address@hidden> wrote:
>> From: Thomas Huth <address@hidden>
>> QEMU currently abort()s if the user tries to specify the mmio_interface
>> device without parameters:
>> x86_64-softmmu/qemu-system-x86_64 -nographic -device mmio_interface
>> qemu-system-x86_64: /home/thuth/devel/qemu/util/error.c:57: error_setv:
>>  Assertion `*errp == ((void *)0)' failed.
>> Aborted (core dumped)
>> This happens because the realize function is trying to set the errp
>> twice in this case. After setting an error, the realize function
>> should immediately return instead.
> It seems like it should be an error to permit this to be
> created from the command line at all
That's also what thought first ... but the commit message of commit
7cc2298c46a6afa4f4ff7e5cd262809c782d701b says that it "can be
hotplugged/hotunplugged" ? ... that's confusing ...

Frederic, I think some more comments in the header of the file would be
really useful here.


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