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Date: Fri, 16 Nov 2018 15:49:06 +0800
From: Ming Lei <ming.lei@redhat.com>
To: Sasha Levin <sashal@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
	Guenter Roeck <linux@roeck-us.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org
Subject: Re: [PATCH 1/2] blk-mq: not embed .mq_kobj and ctx->kobj into queue
 instance
Message-ID: <20181116074905.GB5520@ming.t460p>
References: <20181116032826.11901-1-ming.lei@redhat.com>
 <20181116032826.11901-2-ming.lei@redhat.com>
 <20181116065205.GD1706@sasha-vm>
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In-Reply-To: <20181116065205.GD1706@sasha-vm>
List-ID: <stable.vger.kernel.org>

On Fri, Nov 16, 2018 at 01:52:05AM -0500, Sasha Levin wrote:
> On Fri, Nov 16, 2018 at 11:28:25AM +0800, Ming Lei wrote:
> > Even though .mq_kobj, ctx->kobj and q->kobj share same lifetime
> > from block layer's view, actually they don't because userspace may
> > grab one kobject anytime via sysfs, so each kobject's lifetime has
> > to be independent, then the objects(mq_kobj, ctx) which hosts its
> > own kobject have to be allocated dynamically.
> > 
> > This patch fixes kernel panic issue during booting when DEBUG_KOBJECT_RELEASE
> > is enabled.
> > 
> > Reported-by: Guenter Roeck <linux@roeck-us.net>
> > Cc: Guenter Roeck <linux@roeck-us.net>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Ming Lei <ming.lei@redhat.com>
> 
> What does this patch depend on? It doesn't apply to Linus's tree nor to
> the block tree.
> 
> Also, could you please cc lkml with patches?

It depends on for-4.21/block.

thanks,
Ming