linux-kernel - Re: [PATCH v2 10/15] leds: trigger: blkdev: Add LED trigger activate function

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Date:   Fri, 10 Sep 2021 11:10:28 -0500
From:   Ian Pilcher <arequipeno@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     axboe@...nel.dk, pavel@....cz, linux-leds@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kabel@...nel.org
Subject: Re: [PATCH v2 10/15] leds: trigger: blkdev: Add LED trigger activate
 function

On 9/10/21 1:47 AM, Greg KH wrote:
>> +	/* Don't allow module to be removed while any LEDs are linked */
>> +	if (WARN_ON(!try_module_get(THIS_MODULE))) {
> 
> That pattern is racy and broken and never ever ever add it to the kernel
> again please.  All existing in-kernel users of it are also wrong, we
> have been removing them for decades now.

OK.  (I was misled by the instances that you haven't gotten to yet.)

> You have created a "raw" kobject in the device tree now, which means
> that userspace will not be notified of it and will have a "hole" in it's
> knowledge.  Why not just create a named attribute group to this device
> instead?

What would I pass as the first argument to sysfs_create_link() in that
case?

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