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SubjectRe: [PATCH] lib: vsprintf: check for NULL device_node name in device_node_string()
On 17.02.21 14:50, Andy Shevchenko wrote:
> On Wed, Feb 17, 2021 at 01:15:43PM +0100, Enrico Weigelt, metux IT consult wrote:
>> Under rare circumstances it may happen that a device node's name is NULL
>> (most likely kernel bug in some other place).
> What circumstances? How can I reproduce this? More information, please!

Observed it when applying a broken overlay. (sorry, didn't keep that
broken code :o). In this case, the device_node was left without a name
(pointing to NULL).

>> + pr_warn("device_node without name. Kernel bug ?\n");
> If it's not once, then it's possible to have log spammed with this, right?

It only has occoured once for me. I don't think spamming could happen,
unless one's hacking deeply in the oftree code.

>> + p = "<NULL>";
> We have different standard de facto for NULL pointers to be printed. Actually
> if you wish, you may gather them under one definition (maybe somewhere under
> printk) and export to everybody to use.

Seen it in Petr's reply ... going to use that in v2.


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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering -- +49-151-27565287

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