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From: Ian Pilcher <arequipeno@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: axboe@kernel.dk, pavel@ucw.cz, linux-leds@vger.kernel.org,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	kabel@kernel.org
Subject: Re: [PATCH v2 11/15] leds: trigger: blkdev: Enable linking block devices to LEDs
Date: Fri, 10 Sep 2021 11:25:14 -0500	[thread overview]
Message-ID: <9ba618c6-20aa-c9fd-dfef-1cef57168742@gmail.com> (raw)
In-Reply-To: <YTr/2bflThomjHqL@kroah.com>

On 9/10/21 1:48 AM, Greg KH wrote:
>> +/* Gets or allocs & initializes the blkdev disk for a gendisk */
>> +static int blkdev_get_disk(struct gendisk *const gd)
>> +{
>> +	struct ledtrig_blkdev_disk *disk;
>> +	struct kobject *dir;
>> +
>> +	if (gd->ledtrig != NULL) {
>> +		kobject_get(gd->ledtrig->dir);
> 
> When do you decrement this kobject?

That happens in blkdev_disk_unlink_locked() at line 399.  (Also in the
error path in blkdev_put_disk(), called at line 321.)

Looking at this now, blkdev_disk_unlink_locked() should be calling
blkdev_put_disk(), rather than calling kobject_put() directly.  I'll fix
that.

>> +static void blkdev_put_disk(struct ledtrig_blkdev_disk *const disk)
>> +{
>> +	kobject_put(disk->dir);
>> +
>> +	if (hlist_empty(&disk->leds)) {
>> +		disk->gd->ledtrig = NULL;
>> +		kfree(disk);
> 
> This should happen in the kobject release function, not here, right?

If you're referring to the kfree() call, it's freeing the
ledtrig_blkdev_disk structure, not the gendisk.  I use "gd" for gendisk
pointers and "disk" for ledtrig_blkdev_disk pointers.

> Did you try this out with removable block devices yet?

Absolutely.  I've tested removing both block devices and (user space)
LEDs.

-- 
========================================================================
                  In Soviet Russia, Google searches you!
========================================================================

  reply	other threads:[~2021-09-10 16:25 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09 22:24 [PATCH v2 00/15] Introduce block device LED trigger Ian Pilcher
2021-09-09 22:24 ` [PATCH v2 01/15] docs: Add block device (blkdev) LED trigger documentation Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 02/15] leds: trigger: blkdev: Add build infrastructure Ian Pilcher
2021-09-10  1:32   ` Marek Behún
2021-09-09 22:25 ` [PATCH v2 03/15] leds: trigger: blkdev: Add functions needed by block changes Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 04/15] block: Add block device LED trigger integrations Ian Pilcher
2021-09-09 23:27   ` Chaitanya Kulkarni
2021-09-10  1:23   ` Marek Behún
2021-09-10 15:00     ` Ian Pilcher
2021-09-10  1:38   ` Marek Behún
2021-09-09 22:25 ` [PATCH v2 05/15] leds: trigger: blkdev: Complete functions called by block subsys Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 06/15] leds: trigger: blkdev: Add function to get gendisk by name Ian Pilcher
2021-09-10  6:45   ` Greg KH
2021-09-10 15:17     ` Ian Pilcher
2021-09-10 15:23       ` Greg KH
2021-09-10 16:28     ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 07/15] leds: trigger: blkdev: Add constants and types Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 08/15] leds: trigger: blkdev: Add stub LED trigger structure Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 09/15] leds: trigger: blkdev: Check devices for activity and blink LEDs Ian Pilcher
2021-09-10  1:48   ` Marek Behún
2021-09-10  2:17   ` Marek Behún
2021-09-10 15:09     ` Ian Pilcher
2021-09-10 15:12       ` Marek Behún
2021-09-10 21:23         ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 10/15] leds: trigger: blkdev: Add LED trigger activate function Ian Pilcher
2021-09-10  6:47   ` Greg KH
2021-09-10 16:10     ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 11/15] leds: trigger: blkdev: Enable linking block devices to LEDs Ian Pilcher
2021-09-10  6:48   ` Greg KH
2021-09-10 16:25     ` Ian Pilcher [this message]
2021-09-09 22:25 ` [PATCH v2 12/15] leds: trigger: blkdev: Enable unlinking block devices from LEDs Ian Pilcher
2021-09-14  9:58   ` Dan Carpenter
2021-09-09 22:25 ` [PATCH v2 13/15] leds: trigger: blkdev: Add LED trigger deactivate function Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 14/15] leds: trigger: blkdev: Add remaining sysfs attributes Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 15/15] leds: trigger: blkdev: Add disk cleanup and init/exit functions Ian Pilcher
2021-09-10  2:09 ` [PATCH v2 00/15] Introduce block device LED trigger Marek Behún
2021-09-10 14:04   ` Ian Pilcher

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